Rename blockdev's API routines to GetB/PutB

The goal is to avoid mixing those routines with "character devices" (acia, vpd, kbd) which aren't block devices and have routines that have different expectations. This is a first step to fixing #64.
2024-12-25 17:08:07 +11:00 · 2019-10-30 16:59:35 -04:00 · 2019-10-30 16:59:35 -04:00 · b745f49186
commit b745f49186
parent 38333e9e07
33 changed files with 280 additions and 279 deletions
--- a/apps/at28w/glue.asm
+++ b/apps/at28w/glue.asm
@ -9,7 +9,7 @@
 ; is reached on the block device.
 ; *** Requirements ***
-; blkGetC
+; blkGetB
 ; parseArgs
 ;
 ; *** Includes ***
--- a/apps/at28w/main.asm
+++ b/apps/at28w/main.asm
@ -7,7 +7,7 @@
 ; *** Variables ***
 .equ	AT28W_MAXBYTES	AT28W_RAMSTART
-.equ	AT28W_RAMEND	AT28W_MAXBYTES+2
+.equ	AT28W_RAMEND	@+2
 ; *** Code ***
 at28wMain:
@ -33,7 +33,7 @@ at28wInner:
 	; BC is zero, default to 0x2000 (8k, the size of the AT28)
 	ld	bc, 0x2000
 .loop:
-	call	blkGetC
+	call	blkGetB
 	jr	nz, .loopend
 	ld	(hl), a
 	ld	e, a		; save expected data for verification
--- a/apps/ed/buf.asm
+++ b/apps/ed/buf.asm
@ -4,14 +4,14 @@
 ; Number of lines currently in the buffer
 .equ	BUF_LINECNT	BUF_RAMSTART
 ; List of pointers to strings in scratchpad
-.equ	BUF_LINES	BUF_LINECNT+2
+.equ	BUF_LINES	@+2
 ; Points to the end of the scratchpad, that is, one byte after the last written
 ; char in it.
-.equ	BUF_PADEND	BUF_LINES+ED_BUF_MAXLINES*2
+.equ	BUF_PADEND	@+ED_BUF_MAXLINES*2
 ; The in-memory scratchpad
-.equ	BUF_PAD		BUF_PADEND+2
+.equ	BUF_PAD		@+2
-.equ	BUF_RAMEND	BUF_PAD+ED_BUF_PADMAXLEN
+.equ	BUF_RAMEND	@+ED_BUF_PADMAXLEN
 ; *** Code ***
@ -25,7 +25,7 @@ bufInit:
 	; init pad end in case we have an empty file.
 	ld	(BUF_PADEND), hl
 .loop:
-	call	ioGetC
+	call	ioGetB
 	jr	nz, .loopend
 	or	a		; null? hum, weird. same as LF
 	jr	z, .lineend
--- a/apps/ed/cmd.asm
+++ b/apps/ed/cmd.asm
@ -13,9 +13,9 @@
 ; An address is a one byte type and a two bytes line number (0-indexed)
 .equ	CMD_ADDR1	CMD_RAMSTART
-.equ	CMD_ADDR2	CMD_ADDR1+3
+.equ	CMD_ADDR2	@+3
-.equ	CMD_TYPE	CMD_ADDR2+3
+.equ	CMD_TYPE	@+3
-.equ	CMD_RAMEND	CMD_TYPE+1
+.equ	CMD_RAMEND	@+1
 ; *** Code ***
--- a/apps/ed/io.asm
+++ b/apps/ed/io.asm
@ -9,10 +9,10 @@
 ; Handle of the target file
 .equ	IO_FILE_HDL	IO_RAMSTART
 ; block device targeting IO_FILE_HDL
-.equ	IO_BLK		IO_FILE_HDL+FS_HANDLE_SIZE
+.equ	IO_BLK		@+FS_HANDLE_SIZE
 ; Buffer for lines read from I/O.
-.equ	IO_LINE		IO_BLK+BLOCKDEV_SIZE
+.equ	IO_LINE		@+BLOCKDEV_SIZE
-.equ	IO_RAMEND	IO_LINE+IO_MAXLEN+1	; +1 for null
+.equ	IO_RAMEND	@+IO_MAXLEN+1	; +1 for null
 ; *** Code ***
 ; Given a file name in (HL), open that file in (IO_FILE_HDL) and open a blkdev
@ -25,26 +25,26 @@ ioInit:
 	ld	de, IO_BLK
 	ld	hl, .blkdev
 	jp	blkSet
-.fsGetC:
+.fsGetB:
 	ld	ix, IO_FILE_HDL
-	jp	fsGetC
+	jp	fsGetB
-.fsPutC:
+.fsPutB:
 	ld	ix, IO_FILE_HDL
-	jp	fsPutC
+	jp	fsPutB
 .blkdev:
-	.dw	.fsGetC, .fsPutC
+	.dw	.fsGetB, .fsPutB
-ioGetC:
+ioGetB:
 	push	ix
 	ld	ix, IO_BLK
-	call	_blkGetC
+	call	_blkGetB
 	pop	ix
 	ret
-ioPutC:
+ioPutB:
 	push	ix
 	ld	ix, IO_BLK
-	call	_blkPutC
+	call	_blkPutB
 	pop	ix
 	ret
@ -76,14 +76,14 @@ ioPutLine:
 	ld	a, (hl)
 	or	a
 	jr	z, .loopend		; null, we're finished
-	call	ioPutC
+	call	ioPutB
 	jr	nz, .error
 	inc	hl
 	jr	.loop
 .loopend:
 	; Wrote the whole line, write ending LF
 	ld	a, 0x0a
-	call	ioPutC
+	call	ioPutB
 	jr	z, .end		; success
 	; continue to error
 .error:
--- a/apps/ed/main.asm
+++ b/apps/ed/main.asm
@ -25,16 +25,16 @@
 ; *** Requirements ***
 ; BLOCKDEV_SIZE
 ; FS_HANDLE_SIZE
-; _blkGetC
+; _blkGetB
-; _blkPutC
+; _blkPutB
 ; _blkSeek
 ; _blkTell
 ; addHL
 ; cpHLDE
 ; fsFindFN
 ; fsOpen
-; fsGetC
+; fsGetB
-; fsPutC
+; fsPutB
 ; fsSetSize
 ; intoHL
 ; printstr
@ -46,7 +46,7 @@
 ; *** Variables ***
 ;
 .equ	ED_CURLINE	ED_RAMSTART
-.equ	ED_RAMEND	ED_CURLINE+2
+.equ	ED_RAMEND	@+2
 edMain:
 	; because ed only takes a single string arg, we can use HL directly
--- a/apps/sdct/glue.asm
+++ b/apps/sdct/glue.asm
@ -4,15 +4,15 @@
 ; sectors. Collapse OS doesn't have a random number generator, so we'll simply
 ; rely on initial SRAM value, which tend is random enough for our purpose.
 ;
-; How it works is simple. From its designated RAMSTART, it calls PutC until it
+; How it works is simple. From its designated RAMSTART, it calls PutB until it
 ; reaches the end of RAM (0xffff). Then, it starts over and this time it reads
 ; every byte and compares.
 ;
 ; If there's an error, prints out where.
 ;
 ; *** Requirements ***
-; sdcPutC
+; sdcPutB
-; sdcGetC
+; sdcGetB
 ; printstr
 ; printHexPair
 ;
--- a/apps/sdct/main.asm
+++ b/apps/sdct/main.asm
@ -9,7 +9,7 @@ sdctMain:
 	; we set DE to 12 instead of zero
 	push	de		; <|
 	ld	de, 12		;  |
-	call	sdcPutC		;  |
+	call	sdcPutB		;  |
 	pop	de		; <|
 	jr	nz, .error
 	inc	hl
@ -30,7 +30,7 @@ sdctMain:
 .rLoop:
 	push	de		; <|
 	ld	de, 12		;  |
-	call	sdcGetC		;  |
+	call	sdcGetB		;  |
 	pop	de		; <|
 	jr	nz, .error
 	ex	de, hl
--- a/apps/zasm/directive.asm
+++ b/apps/zasm/directive.asm
@ -54,7 +54,7 @@ handleDB:
 	or	a		; cp 0
 	jr	nz, .overflow	; not zero? overflow
 	ld	a, l
-	call	ioPutC
+	call	ioPutB
 	jr	nz, .ioError
 .stopStrLit:
 	call	readComma
@ -84,7 +84,7 @@ handleDB:
 	or	a		; when we encounter 0, that was what used to
 	jr	z, .stopStrLit	; be our closing quote. Stop.
 	; Normal character, output
-	call	ioPutC
+	call	ioPutB
 	jr	nz, .ioError
 	jr	.stringLiteral
@ -98,10 +98,10 @@ handleDW:
 	jr	nz, .badarg
 	push	ix \ pop hl
 	ld	a, l
-	call	ioPutC
+	call	ioPutB
 	jr	nz, .ioError
 	ld	a, h
-	call	ioPutC
+	call	ioPutB
 	jr	nz, .ioError
 	call	readComma
 	jr	z, .loop
@ -208,7 +208,7 @@ handleFIL:
 	or	c
 	jr	z, .loopend
 	xor	a
-	call	ioPutC
+	call	ioPutB
 	jr	nz, .ioError
 	dec	bc
 	jr	.loop
@ -314,7 +314,7 @@ getDirectiveID:
 ; Parse directive specified in A (D_* const) with args in I/O and act in
 ; an appropriate manner. If the directive results in writing data at its
-; current location, that data is directly written through ioPutC.
+; current location, that data is directly written through ioPutB.
 ; Each directive has the same return value pattern: Z on success, not-Z on
 ; error, A contains the error number (ERR_*).
 parseDirective:
--- a/apps/zasm/glue.asm
+++ b/apps/zasm/glue.asm
@ -5,9 +5,9 @@
 ;
 ; We don't buffer the whole source in memory, so we need our input blkdev to
 ; support Seek so we can read the file a second time. So, for input, we need
-; GetC and Seek.
+; GetB and Seek.
 ;
-; For output, we only need PutC. Output doesn't start until the second pass.
+; For output, we only need PutB. Output doesn't start until the second pass.
 ;
 ; The goal of the second pass is to assign values to all symbols so that we
 ; can have forward references (instructions referencing a label that happens
@ -33,11 +33,11 @@
 ; blkSet
 ; fsFindFN
 ; fsOpen
-; fsGetC
+; fsGetB
 ; cpHLDE
 ; parseArgs
-; _blkGetC
+; _blkGetB
-; _blkPutC
+; _blkPutB
 ; _blkSeek
 ; _blkTell
 ; printstr
--- a/apps/zasm/instr.asm
+++ b/apps/zasm/instr.asm
@ -888,7 +888,7 @@ parseInstruction:
 	ld	hl, INS_UPCODE
 .loopWrite:
 	ld	a, (hl)
-	call	ioPutC
+	call	ioPutB
 	jr	nz, .ioError
 	inc	hl
 	djnz	.loopWrite
--- a/apps/zasm/io.asm
+++ b/apps/zasm/io.asm
@ -8,7 +8,7 @@
 ; maintaining IO_PC and of properly disabling output on first pass.
 ;
 ; On top of that, this unit has the responsibility of keeping track of the
-; current lineno. Whenever GetC is called, we check if the fetched char is a
+; current lineno. Whenever GetB is called, we check if the fetched byte is a
 ; newline. If it is, we increase our lineno. This unit is the best place to
 ; keep track of this because we have to handle ioRecallPos.
 ;
@ -17,7 +17,7 @@
 ; mechanism, that is, a way to say "you see that character I've just read? that
 ; was out of my bounds. Could you make it as if I had never read it?". That
 ; buffer is one character big and is made with the expectation that ioPutBack
-; is always called right after a ioGetC (when it's called).
+; is always called right after a ioGetB (when it's called).
 ;
 ; ioPutBack will mess up seek and tell offsets, so thath "put back" should be
 ; consumed before having to seek and tell.
@ -25,7 +25,7 @@
 ; That's for the general rules.
 ;
 ; Now, let's enter includes. To simplify processing, we make include mostly
-; transparent to all other units. They always read from ioGetC and a include
+; transparent to all other units. They always read from ioGetB and a include
 ; directive should have the exact same effect as copy/pasting the contents of
 ; the included file in the caller.
 ;
@ -33,7 +33,7 @@
 ; can include.
 ;
 ; When we include, all we do here is open the file with fsOpen and set a flag
-; indicating that we're inside an include. When that flag is on, GetC, Seek and
+; indicating that we're inside an include. When that flag is on, GetB, Seek and
 ; Tell are transparently redirected to their fs* counterpart.
 ;
 ; When we reach EOF in an included file, we transparently unset the "in include"
@ -73,7 +73,7 @@ ioInit:
 	call	blkSet
 	jp	ioResetCounters
-ioGetC:
+ioGetB:
 	ld	a, (IO_PUTBACK_BUF)
 	or	a		; cp 0
 	jr	nz, .getback
@ -81,7 +81,7 @@ ioGetC:
 	jr	z, .normalmode
 	; We're in "include mode", read from FS
 	ld	ix, IO_INCLUDE_BLK
-	call	_blkGetC
+	call	_blkGetB
 	jr	nz, .includeEOF
 	cp	0x0a		; newline
 	ret	nz		; not newline? nothing to do
@ -111,7 +111,7 @@ ioGetC:
 .normalmode:
 	; normal mode, read from IN stream
 	ld	ix, IO_IN_BLK
-	call	_blkGetC
+	call	_blkGetB
 	cp	0x0a		; newline
 	ret	nz		; not newline? return
 	; inc current lineno
@ -133,14 +133,14 @@ _callIX:
 	jp	(ix)
 	ret
-; Put back non-zero character A into the "ioGetC stack". The next ioGetC call,
+; Put back non-zero character A into the "ioGetB stack". The next ioGetB call,
 ; instead of reading from IO_IN_BLK, will return that character. That's the
 ; easiest way I found to handle the readWord/gotoNextLine problem.
 ioPutBack:
 	ld	(IO_PUTBACK_BUF), a
 	ret
-ioPutC:
+ioPutB:
 	push	hl
 	ld	hl, (IO_PC)
 	inc	hl
@ -151,7 +151,7 @@ ioPutC:
 	jr	z, .skip
 	pop	af
 	ld	ix, IO_OUT_BLK
-	jp	_blkPutC
+	jp	_blkPutB
 .skip:
 	pop	af
 	cp	a		; ensure Z
@ -240,7 +240,7 @@ ioOpenInclude:
 	cp	a		; ensure Z
 	ret
-; Open file specified in (HL) and spit its contents through ioPutC
+; Open file specified in (HL) and spit its contents through ioPutB
 ; Sets Z on success.
 ioSpitBin:
 	call	fsFindFN
@ -251,9 +251,9 @@ ioSpitBin:
 	ld	hl, 0
 .loop:
 	ld	ix, IO_BIN_HDL
-	call	fsGetC
+	call	fsGetB
 	jr	nz, .loopend
-	call	ioPutC
+	call	ioPutB
 	inc	hl
 	jr	.loop
 .loopend:
@ -274,12 +274,12 @@ ioLineNo:
 	pop	af
 	ret
-_ioIncGetC:
+_ioIncGetB:
 	ld	ix, IO_INCLUDE_HDL
-	jp	fsGetC
+	jp	fsGetB
 _ioIncBlk:
-	.dw	_ioIncGetC, unsetZ
+	.dw	_ioIncGetB, unsetZ
 ; call printstr followed by newline
 ioPrintLN:
--- a/apps/zasm/main.asm
+++ b/apps/zasm/main.asm
@ -128,7 +128,7 @@ zasmParseFile:
 	ret
 ; Parse next token and accompanying args (when relevant) in I/O, write the
-; resulting opcode(s) through ioPutC and increases (IO_PC) by the number of
+; resulting opcode(s) through ioPutB and increases (IO_PC) by the number of
 ; bytes written. BC is set to the result of the call to tokenize.
 ; Sets Z if parse was successful, unset if there was an error. EOF is not an
 ; error. If there is an error, A is set to the corresponding error code (ERR_*).
--- a/apps/zasm/tok.asm
+++ b/apps/zasm/tok.asm
@ -74,12 +74,12 @@ isLabel:
 ; Read I/O as long as it's whitespace. When it's not, stop and return the last
 ; read char in A
 _eatWhitespace:
-	call	ioGetC
+	call	ioGetB
 	call	isSep
 	ret	nz
 	jr	_eatWhitespace
-; Read ioGetC until a word starts, then read ioGetC as long as there is no
+; Read ioGetB until a word starts, then read ioGetB as long as there is no
 ; separator and put that contents in (scratchpad), null terminated, for a
 ; maximum of SCRATCHPAD_SIZE-1 characters.
 ; If EOL (\n, \r or comment) or EOF is hit before we could read a word, we stop
@ -104,7 +104,7 @@ readWord:
 .loop:
 	ld	(hl), a
 	inc	hl
-	call	ioGetC
+	call	ioGetB
 	call	isSepOrLineEnd
 	jr	z, .success
 	cp	','
@ -130,7 +130,7 @@ readWord:
 	; inside quotes, we accept literal whitespaces, but not line ends.
 	ld	(hl), a
 	inc	hl
-	call	ioGetC
+	call	ioGetB
 	cp	'"'
 	jr	z, .loop	; ending the quote ends the word
 	call	isLineEnd
@ -143,12 +143,12 @@ readWord:
 	; single quote is more straightforward: we have 3 chars and we put them
 	; right in scratchpad
 	ld	(hl), a
-	call	ioGetC
+	call	ioGetB
 	or	a
 	jr	z, .error
 	inc	hl
 	ld	(hl), a
-	call	ioGetC
+	call	ioGetB
 	cp	0x27		; '
 	jr	nz, .error
 	inc	hl
@ -165,7 +165,7 @@ readComma:
 	call	unsetZ
 	ret
-; Read ioGetC until we reach the beginning of next line, skipping comments if
+; Read ioGetB until we reach the beginning of next line, skipping comments if
 ; necessary. This skips all whitespace, \n, \r, comments until we reach the
 ; first non-comment character. Then, we put it back (ioPutBack) and return.
 ;
@ -176,7 +176,7 @@ readComma:
 gotoNextLine:
 .loop1:
 	; first loop is "strict", that is: we error out on non-whitespace.
-	call	ioGetC
+	call	ioGetB
 	call	isSepOrLineEnd
 	ret	nz		; error
 	or	a		; cp 0
@ -189,7 +189,7 @@ gotoNextLine:
 .loop2:
 	; second loop is the "comment loop": anything is valid and we just run
 	; until EOL.
-	call	ioGetC
+	call	ioGetB
 	or	a		; cp 0
 	jr	z, .eof
 	cp	'\'		; special case: '\' doesn't count as a line end
@ -201,7 +201,7 @@ gotoNextLine:
 .loop3:
 	; Loop 3 happens after we reach our first line sep. This means that we
 	; wade through whitespace until we reach a non-whitespace character.
-	call	ioGetC
+	call	ioGetB
 	or	a		; cp 0
 	jr	z, .eof
 	cp	0x3b		; ';'
--- a/doc/blockdev.md
+++ b/doc/blockdev.md
@ -13,11 +13,11 @@ Definition of block devices happen at include time. It would look like:
    BLOCKDEV_COUNT .equ 1
    #include "blockdev.asm"
    ; List of devices
-    .dw	aciaGetC, aciaPutC
+    .dw	sdcGetB, sdcPutB
    [...]
-That tells `blockdev` that we're going to set up one device, that its GetC and
+That tells `blockdev` that we're going to set up one device, that its GetB and
-PutC are the ones defined by `acia.asm`.
+PutB are the ones defined by `sdc.asm`.
 If your block device is read-only or write-only, use dummy routines. `unsetZ`
 is a good choice since it will return with the `Z` flag unset, indicating an
@ -28,16 +28,16 @@ seek pointer. This seek pointer is used in shell commands described below.
 ## Routine definitions
-Parts that implement GetC and PutC do so in a loosely-coupled manner, but
+Parts that implement GetB and PutB do so in a loosely-coupled manner, but
 they should try to adhere to the convention, that is:
-**GetC**: Get the character at position specified by `HL`. If it supports 32-bit
+**GetB**: Get the byte at position specified by `HL`. If it supports 32-bit
          addressing, `DE` contains the high-order bytes. Return the result in
          `A`. If there's an error (for example, address out of range), unset
          `Z`. This routine is not expected to block. We expect the result to be
          immediate.
-**PutC**: The opposite of GetC. Write the character in `A` at specified
+**PutB**: The opposite of GetB. Write the character in `A` at specified
          position. `Z` unset on error.
 ## Shell usage
--- a/kernel/blockdev.asm
+++ b/kernel/blockdev.asm
@ -2,34 +2,34 @@
 ;
 ; A block device is an abstraction over something we can read from, write to.
 ;
-; A device that fits this abstraction puts the properly hook into itself, and
+; A device that fits this abstraction puts the proper hook into itself, and then
-; then the glue code assigns a blockdev ID to that device. It then becomes easy
+; the glue code assigns a blockdev ID to that device. It then becomes easy to
-; to access arbitrary devices in a convenient manner.
+; access arbitrary devices in a convenient manner.
 ;
-; This module exposes a seek/tell/getc/putc API that is then re-routed to
+; This module exposes a seek/tell/getb/putb API that is then re-routed to
 ; underlying drivers. There will eventually be more than one driver type, but
 ; for now we sit on only one type of driver: random access driver.
 ;
 ; *** Random access drivers ***
 ;
-; Random access drivers are expected to supply two routines: GetC and PutC.
+; Random access drivers are expected to supply two routines: GetB and PutB.
 ;
-; GetC:
+; GetB:
-; Reads one character at address specified in DE/HL and returns its value in A.
+; Reads one byte at address specified in DE/HL and returns its value in A.
 ; Sets Z according to whether read was successful: Set if successful, unset
 ; if not.
 ;
 ; Unsuccessful reads generally mean that requested addr is out of bounds (we
 ; reached EOF).
 ;
-; PutC:
+; PutB:
-; Writes character in A at address specified in DE/HL. Sets Z according to
+; Writes byte in A at address specified in DE/HL. Sets Z according to whether
-; whether the operation was successful.
+; the operation was successful.
 ;
 ; Unsuccessful writes generally mean that we're out of bounds for writing.
 ;
 ; All routines are expected to preserve unused registers except IX which is
-; explicitly protected during GetC/PutC calls. This makes quick "handle+jump"
+; explicitly protected during GetB/PutB calls. This makes quick "handle+jump"
 ; definitions possible.
@ -46,9 +46,9 @@
 .equ	BLOCKDEV_SIZE			8
 ; *** VARIABLES ***
 ; Pointer to the selected block device. A block device is a 8 bytes block of
-; memory with pointers to GetC, PutC, and a 32-bit counter, in that order.
+; memory with pointers to GetB, PutB, and a 32-bit counter, in that order.
 .equ	BLOCKDEV_SEL		BLOCKDEV_RAMSTART
-.equ	BLOCKDEV_RAMEND		BLOCKDEV_SEL+BLOCKDEV_SIZE
+.equ	BLOCKDEV_RAMEND		@+BLOCKDEV_SIZE
 ; *** CODE ***
 ; Select block index specified in A and place them in routine pointers at (DE).
@ -121,16 +121,16 @@ _blkInc:
 	pop	af
 	ret
-; Reads one character from selected device and returns its value in A.
+; Reads one byte from selected device and returns its value in A.
 ; Sets Z according to whether read was successful: Set if successful, unset
 ; if not.
-blkGetC:
+blkGetB:
 	push	ix
 	ld	ix, BLOCKDEV_SEL
-	call	_blkGetC
+	call	_blkGetB
 	pop	ix
 	ret
-_blkGetC:
+_blkGetB:
 	push	hl
 	push	de
 	call	_blkTell
@ -139,20 +139,20 @@ _blkGetC:
 	pop	hl
 	jr	_blkInc		; advance and return
-; Writes character in A in current position in the selected device. Sets Z
+; Writes byte in A in current position in the selected device. Sets Z according
-; according to whether the operation was successful.
+; to whether the operation was successful.
-blkPutC:
+blkPutB:
 	push	ix
 	ld	ix, BLOCKDEV_SEL
-	call	_blkPutC
+	call	_blkPutB
 	pop	ix
 	ret
-_blkPutC:
+_blkPutB:
 	push	ix
 	push	hl
 	push	de
 	call	_blkTell
-	inc	ix	; make IX point to PutC
+	inc	ix	; make IX point to PutB
 	inc	ix
 	call	callIXI
 	pop	de
@ -160,7 +160,7 @@ _blkPutC:
 	pop	ix
 	jr	_blkInc		; advance and return
-; Reads B chars from blkGetC and copy them in (HL).
+; Reads B chars from blkGetB and copy them in (HL).
 ; Sets Z if successful, unset Z if there was an error.
 blkRead:
 	push	ix
@ -172,7 +172,7 @@ _blkRead:
 	push	hl
 	push	bc
 .loop:
-	call	_blkGetC
+	call	_blkGetB
 	jr	nz, .end	; Z already unset
 	ld	(hl), a
 	inc	hl
@ -183,7 +183,7 @@ _blkRead:
 	pop	hl
 	ret
-; Writes B chars to blkPutC from (HL).
+; Writes B chars to blkPutB from (HL).
 ; Sets Z if successful, unset Z if there was an error.
 blkWrite:
 	push	ix
@ -196,7 +196,7 @@ _blkWrite:
 	push	bc
 .loop:
 	ld	a, (hl)
-	call	_blkPutC
+	call	_blkPutB
 	jr	nz, .end	; Z already unset
 	inc	hl
 	djnz	.loop
@ -217,11 +217,11 @@ _blkWrite:
 ; (high). DE is only used for mode 0.
 ;
 ; When seeking to an out-of-bounds position, the resulting position will be
-; one position ahead of the last valid position. Therefore, GetC after a seek
+; one position ahead of the last valid position. Therefore, GetB after a seek
 ; to end would always fail.
 ;
 ; If the device is "growable", it's possible that seeking to end when calling
-; PutC doesn't necessarily result in a failure.
+; PutB doesn't necessarily result in a failure.
 blkSeek:
 	push	ix
 	ld	ix, BLOCKDEV_SEL
@ -309,6 +309,6 @@ _blkTell:
 ; This label is at the end of the file on purpose: the glue file should include
 ; a list of device routine table entries just after the include. Each line
-; has 4 word addresses: GetC, PutC and Seek, Tell. An entry could look like:
+; has 2 word addresses: GetB and PutB. An entry could look like:
-; .dw     mmapGetC, mmapPutC, mmapSeek, mmapTell
+; .dw     mmapGetB, mmapPutB
 blkDevTbl:
--- a/kernel/blockdev_cmds.asm
+++ b/kernel/blockdev_cmds.asm
@ -50,7 +50,7 @@ blkSeekCmd:
 ; stop loading.
 ;
 ; Returns a SHELL_ERR_IO_ERROR only if we couldn't read any byte (if the first
-; call to GetC failed)
+; call to GetB failed)
 ;
 ; Example: load 42
 blkLoadCmd:
@ -62,12 +62,12 @@ blkLoad:
 	ld	a, (hl)
 	ld	b, a
 	ld	hl, (SHELL_MEM_PTR)
-	call	blkGetC
+	call	blkGetB
 	jr	nz, .ioError
-	jr	.intoLoop	; we'v already called blkGetC. don't call it
+	jr	.intoLoop	; we'v already called blkGetB. don't call it
 				; again.
 .loop:
-	call	blkGetC
+	call	blkGetB
 .intoLoop:
 	ld	(hl), a
 	inc	hl
@ -86,7 +86,7 @@ blkLoad:
 ; Load the specified number of bytes (max 0x100, 0 means 0x100) from the current
 ; memory pointer and write them to I/O. Memory pointer doesn't move. This puts
-; chars to blkPutC. Raises error if not all bytes could be written.
+; chars to blkPutB. Raises error if not all bytes could be written.
 ;
 ; Example: save 42
 blkSaveCmd:
@ -101,7 +101,7 @@ blkSave:
 .loop:
 	ld	a, (hl)
 	inc	hl
-	call	blkPutC
+	call	blkPutB
 	jr	nz, .ioError
 	djnz	.loop
 .loopend:
--- a/kernel/err.h
+++ b/kernel/err.h
@ -9,6 +9,6 @@
 .equ	BLOCKDEV_ERR_OUT_OF_BOUNDS	0x03
 .equ	BLOCKDEV_ERR_UNSUPPORTED	0x04
-; IO routines (GetC, PutC) returned an error in a load/save command
+; IO routines (GetB, PutB) returned an error in a load/save command
 .equ	SHELL_ERR_IO_ERROR	0x05
--- a/kernel/fs.asm
+++ b/kernel/fs.asm
@ -3,7 +3,7 @@
 ; Collapse OS filesystem (CFS) is not made to be convenient, but to be simple.
 ; This is little more than "named storage blocks". Characteristics:
 ;
-; * a filesystem sits upon a blockdev. It needs GetC, PutC, Seek.
+; * a filesystem sits upon a blockdev. It needs GetB, PutB, Seek.
 ; * No directory. Use filename prefix to group.
 ; * First block of each file has metadata. Others are raw data.
 ; * No FAT. Files are a chain of blocks of a predefined size. To enumerate
@ -98,12 +98,12 @@
 ; This pointer is 32 bits. 32 bits pointers are a bit awkward: first two bytes
 ; are high bytes *low byte first*, and then the low two bytes, same order.
 ; When loaded in HL/DE, the four bytes are loaded in this order: E, D, L, H
-.equ	FS_START	FS_BLK+BLOCKDEV_SIZE
+.equ	FS_START	@+BLOCKDEV_SIZE
 ; This variable below contain the metadata of the last block we moved
 ; to. We read this data in memory to avoid constant seek+read operations.
-.equ	FS_META		FS_START+4
+.equ	FS_META		@+4
-.equ	FS_HANDLES	FS_META+FS_METASIZE
+.equ	FS_HANDLES	@+FS_METASIZE
-.equ	FS_RAMEND	FS_HANDLES+FS_HANDLE_COUNT*FS_HANDLE_SIZE
+.equ	FS_RAMEND	@+FS_HANDLE_COUNT*FS_HANDLE_SIZE
 ; *** DATA ***
 P_FS_MAGIC:
@ -333,10 +333,10 @@ fsIsDeleted:
 ; we can still access the FS even if blkdev selection changes. These routines
 ; below mimic blkdev's methods, but for our private mount.
-fsblkGetC:
+fsblkGetB:
 	push	ix
 	ld	ix, FS_BLK
-	call	_blkGetC
+	call	_blkGetB
 	pop	ix
 	ret
@ -347,10 +347,10 @@ fsblkRead:
 	pop	ix
 	ret
-fsblkPutC:
+fsblkPutB:
 	push	ix
 	ld	ix, FS_BLK
-	call	_blkPutC
+	call	_blkPutB
 	pop	ix
 	ret
@ -458,27 +458,27 @@ fsSetSize:
 	; cache.
 	ld	a, l
 	ld	(ix+4), a
-	call	fsblkPutC
+	call	fsblkPutB
 	ld	a, h
 	ld	(ix+5), a
-	call	fsblkPutC
+	call	fsblkPutB
 	pop	hl		; <-- lvl 1
 	xor	a	; ensure Z
 	ret
 ; Read a byte in handle at (IX) at position HL and put it into A.
 ; Z is set on success, unset if handle is at the end of the file.
-fsGetC:
+fsGetB:
 	call	fsWithinBounds
 	jr	z, .proceed
-	; We want to unset Z, but also return 0 to ensure that a GetC that
+	; We want to unset Z, but also return 0 to ensure that a GetB that
 	; doesn't check Z doesn't end up with false data.
 	xor	a
 	jp	unsetZ		; returns
 .proceed:
 	push	hl
 	call	fsPlaceH
-	call	fsblkGetC
+	call	fsblkGetB
 	cp	a		; ensure Z
 	pop	hl
 	ret
@ -486,10 +486,10 @@ fsGetC:
 ; Write byte A in handle (IX) at position HL.
 ; Z is set on success, unset if handle is at the end of the file.
 ; TODO: detect end of block alloc
-fsPutC:
+fsPutB:
 	push	hl
 	call	fsPlaceH
-	call	fsblkPutC
+	call	fsblkPutB
 	pop	hl
 	; if HL is out of bounds, increase bounds
 	call	fsWithinBounds
--- a/kernel/mmap.asm
+++ b/kernel/mmap.asm
@ -24,7 +24,7 @@ _mmapAddr:
 	pop	de
 	jp	unsetZ
-mmapGetC:
+mmapGetB:
 	push	hl
 	call	_mmapAddr
 	jr	nz, .end
@ -35,7 +35,7 @@ mmapGetC:
 	ret
-mmapPutC:
+mmapPutB:
 	push	hl
 	call	_mmapAddr
 	jr	nz, .end
--- a/kernel/pgm.asm
+++ b/kernel/pgm.asm
@ -16,7 +16,7 @@
 ;
 ; *** Variables ***
 .equ	PGM_HANDLE	PGM_RAMSTART
-.equ	PGM_RAMEND	PGM_HANDLE+FS_HANDLE_SIZE
+.equ	PGM_RAMEND	@+FS_HANDLE_SIZE
 ; Routine suitable to plug into SHELL_CMDHOOK. HL points to the full cmdline.
 ; which has been processed to replace the first ' ' with a null char.
@ -48,7 +48,7 @@ pgmRun:
 	ld	hl, 0		; addr that we read in file handle
 	ld	de, PGM_CODEADDR	; addr in mem we write to
 .loop:
-	call	fsGetC		; we use Z at end of loop
+	call	fsGetB		; we use Z at end of loop
 	ld	(de), a		; Z preserved
 	inc	hl		; Z preserved in 16-bit
 	inc	de		; Z preserved in 16-bit
--- a/kernel/sdc.asm
+++ b/kernel/sdc.asm
@ -20,14 +20,14 @@
 ;
 ; SD card's lowest common denominator in terms of block size is 512 bytes, so
 ; that's what we deal with. To avoid wastefully reading entire blocks from the
-; card for one byte read ops, we buffer the last read block. If a GetC or PutC
+; card for one byte read ops, we buffer the last read block. If a GetB or PutB
 ; operation is within that buffer, then no interaction with the SD card is
 ; necessary.
 ;
-; As soon as a GetC or PutC operation is made that is outside the current
+; As soon as a GetB or PutB operation is made that is outside the current
 ; buffer, we load a new block.
 ;
-; When we PutC, we flag the buffer as "dirty". On the next buffer change (during
+; When we PutB, we flag the buffer as "dirty". On the next buffer change (during
 ; an out-of-buffer request or during an explicit "flush" operation), bytes
 ; currently in the buffer will be written to the SD card.
 ;
@ -37,10 +37,10 @@
 ; right away, in another file on the same card (zasm), on a different sector.
 ;
 ; If we only have one buffer in this scenario, we'll end up loading a new sector
-; at each GetC/PutC operation and, more importantly, writing a whole block for
+; at each GetB/PutB operation and, more importantly, writing a whole block for
 ; a few bytes each time. This will wear the card prematurely (and be very slow).
 ;
-; With 2 buffers, we solve the problem. Whenever GetC/PutC is called, we first
+; With 2 buffers, we solve the problem. Whenever GetB/PutB is called, we first
 ; look if one of the buffer holds our sector. If not, we see if one of the
 ; buffer is clean (not dirty). If yes, we use this one. If both are dirty or
 ; clean, we use any. This way, as long as writing isn't made to random
@ -721,7 +721,7 @@ _sdcPlaceBuf:
 	xor	a		; ensure Z
 	ret
-sdcGetC:
+sdcGetB:
 	push	hl
 	call	_sdcPlaceBuf
 	jr	nz, .error
@ -736,7 +736,7 @@ sdcGetC:
 	pop	hl
 	ret
-sdcPutC:
+sdcPutB:
 	push	hl
 	push	af		; let's remember the char we put, _sdcPlaceBuf
 				; destroys A.
--- a/recipes/rc2014/eeprom/glue.asm
+++ b/recipes/rc2014/eeprom/glue.asm
@ -24,7 +24,7 @@ jp	aciaInt
 .equ	BLOCKDEV_COUNT		1
 .inc "blockdev.asm"
 ; List of devices
-.dw	mmapGetC, mmapPutC
+.dw	mmapGetB, mmapPutB
 .equ	STDIO_RAMSTART	BLOCKDEV_RAMEND
 .inc "stdio.asm"
--- a/recipes/rc2014/sdcard/glue.asm
+++ b/recipes/rc2014/sdcard/glue.asm
@ -29,8 +29,8 @@ jp	aciaInt
 .equ	BLOCKDEV_COUNT		2
 .inc "blockdev.asm"
 ; List of devices
-.dw	sdcGetC, sdcPutC
+.dw	sdcGetB, sdcPutB
-.dw	blk2GetC, blk2PutC
+.dw	blk2GetB, blk2PutB
 .equ	STDIO_RAMSTART	BLOCKDEV_RAMEND
@ -83,10 +83,10 @@ init:
 ; *** blkdev 2: file handle 0 ***
-blk2GetC:
+blk2GetB:
 	ld	ix, FS_HANDLES
-	jp	fsGetC
+	jp	fsGetB
-blk2PutC:
+blk2PutB:
 	ld	ix, FS_HANDLES
-	jp	fsPutC
+	jp	fsPutB
--- a/recipes/rc2014/zasm/glue.asm
+++ b/recipes/rc2014/zasm/glue.asm
@ -27,7 +27,7 @@
 	jp	blkSet
 	jp	fsFindFN
 	jp	fsOpen
-	jp	fsGetC
+	jp	fsGetB
 	jp	cpHLDE		; approaching 0x38...
 ; interrupt hook
@ -37,14 +37,14 @@ jp	aciaInt
 ; *** Jump Table (cont.) ***
 	jp	parseArgs
 	jp	printstr
-	jp	_blkGetC
+	jp	_blkGetB
-	jp	_blkPutC
+	jp	_blkPutB
 	jp	_blkSeek
 	jp	_blkTell
 	jp	printHexPair
-	jp	sdcGetC
+	jp	sdcGetB
-	jp	sdcPutC
+	jp	sdcPutB
-	jp	blkGetC
+	jp	blkGetB
 .inc "err.h"
 .inc "core.asm"
@ -55,10 +55,10 @@ jp	aciaInt
 .equ	BLOCKDEV_COUNT		4
 .inc "blockdev.asm"
 ; List of devices
-.dw	sdcGetC, sdcPutC
+.dw	sdcGetB, sdcPutB
-.dw	blk1GetC, blk1PutC
+.dw	blk1GetB, blk1PutB
-.dw	blk2GetC, blk2PutC
+.dw	blk2GetB, blk2PutB
-.dw	mmapGetC, mmapPutC
+.dw	mmapGetB, mmapPutB
 .equ	MMAP_START	0xe000
@ -116,20 +116,20 @@ init:
 ; *** blkdev 1: file handle 0 ***
-blk1GetC:
+blk1GetB:
 	ld	ix, FS_HANDLES
-	jp	fsGetC
+	jp	fsGetB
-blk1PutC:
+blk1PutB:
 	ld	ix, FS_HANDLES
-	jp	fsPutC
+	jp	fsPutB
 ; *** blkdev 2: file handle 1 ***
-blk2GetC:
+blk2GetB:
 	ld	ix, FS_HANDLES+FS_HANDLE_SIZE
-	jp	fsGetC
+	jp	fsGetB
-blk2PutC:
+blk2PutB:
 	ld	ix, FS_HANDLES+FS_HANDLE_SIZE
-	jp	fsPutC
+	jp	fsPutB
--- a/recipes/rc2014/zasm/user.h
+++ b/recipes/rc2014/zasm/user.h
@ -5,30 +5,31 @@
 ; *** JUMP TABLE ***
 .equ    strncmp        0x03
-.equ    addDE          0x06
+.equ    addDE          @+3
-.equ    addHL          0x09
+.equ    addHL          @+3
-.equ    upcase         0x0c
+.equ    upcase         @+3
-.equ    unsetZ         0x0f
+.equ    unsetZ         @+3
-.equ    intoDE         0x12
+.equ    intoDE         @+3
-.equ    intoHL         0x15
+.equ    intoHL         @+3
-.equ    writeHLinDE    0x18
+.equ    writeHLinDE    @+3
-.equ    findchar       0x1b
+.equ    findchar       @+3
-.equ    parseHex       0x1e
+.equ    parseHex       @+3
-.equ    parseHexPair   0x21
+.equ    parseHexPair   @+3
-.equ    blkSel         0x24
+.equ    blkSel         @+3
-.equ    blkSet         0x27
+.equ    blkSet         @+3
-.equ    fsFindFN       0x2a
+.equ    fsFindFN       @+3
-.equ    fsOpen         0x2d
+.equ    fsOpen         @+3
-.equ    fsGetC         0x30
+.equ    fsGetB         @+3
-.equ    cpHLDE         0x33
+.equ    cpHLDE         @+3
 ; now at 0x36
 .equ    parseArgs      0x3b
-.equ    printstr       0x3e
+.equ    printstr       @+3
-.equ    _blkGetC       0x41
+.equ    _blkGetB       @+3
-.equ    _blkPutC       0x44
+.equ    _blkPutB       @+3
-.equ    _blkSeek       0x47
+.equ    _blkSeek       @+3
-.equ    _blkTell       0x4a
+.equ    _blkTell       @+3
-.equ    printHexPair   0x4d
+.equ    printHexPair   @+3
-.equ    sdcGetC        0x50
+.equ    sdcGetB        @+3
-.equ    sdcPutC        0x53
+.equ    sdcPutB        @+3
-.equ    blkGetC        0x56
+.equ    blkGetB        @+3
--- a/recipes/sms/romasm/glue.asm
+++ b/recipes/sms/romasm/glue.asm
@ -22,14 +22,14 @@
 	jp	blkSet
 	jp	fsFindFN
 	jp	fsOpen
-	jp	fsGetC
+	jp	fsGetB
-	jp	fsPutC
+	jp	fsPutB
 	jp	fsSetSize
 	jp	cpHLDE
 	jp	parseArgs
 	jp	printstr
-	jp	_blkGetC
+	jp	_blkGetB
-	jp	_blkPutC
+	jp	_blkPutB
 	jp	_blkSeek
 	jp	_blkTell
 	jp	printcrlf
@ -63,9 +63,9 @@
 .equ	BLOCKDEV_COUNT		3
 .inc "blockdev.asm"
 ; List of devices
-.dw	mmapGetC, mmapPutC
+.dw	mmapGetB, mmapPutB
-.dw	f0GetC, f0PutC
+.dw	f0GetB, f0PutB
-.dw	f1GetC, f1PutC
+.dw	f1GetB, f1PutB
 .equ	FS_RAMSTART	BLOCKDEV_RAMEND
@ -121,21 +121,21 @@ init:
 	ld	(SHELL_CMDHOOK), hl
 	jp	shellLoop
-f0GetC:
+f0GetB:
 	ld	ix, FS_HANDLES
-	jp	fsGetC
+	jp	fsGetB
-f0PutC:
+f0PutB:
 	ld	ix, FS_HANDLES
-	jp	fsPutC
+	jp	fsPutB
-f1GetC:
+f1GetB:
 	ld	ix, FS_HANDLES+FS_HANDLE_SIZE
-	jp	fsGetC
+	jp	fsGetB
-f1PutC:
+f1PutB:
 	ld	ix, FS_HANDLES+FS_HANDLE_SIZE
-	jp	fsPutC
+	jp	fsPutB
 edCmd:
 	.db	"ed", 0, 0, 0b1001, 0, 0
--- a/recipes/sms/romasm/user-tmpl.h
+++ b/recipes/sms/romasm/user-tmpl.h
@ -30,14 +30,14 @@
 .equ	blkSet			0x27
 .equ	fsFindFN		0x2a
 .equ	fsOpen			0x2d
-.equ	fsGetC			0x30
+.equ	fsGetB			0x30
-.equ	fsPutC			0x33
+.equ	fsPutB			0x33
 .equ	fsSetSize		0x36
 .equ	cpHLDE			0x39
 .equ	parseArgs		0x3c
 .equ	printstr		0x3f
-.equ	_blkGetC		0x42
+.equ	_blkGetB		0x42
-.equ	_blkPutC		0x45
+.equ	_blkPutB		0x45
 .equ	_blkSeek		0x48
 .equ	_blkTell		0x4b
 .equ	printcrlf		0x4e
--- a/tools/emul/shell/shell_.asm
+++ b/tools/emul/shell/shell_.asm
@ -26,14 +26,14 @@
 	jp	blkSet
 	jp	fsFindFN
 	jp	fsOpen
-	jp	fsGetC
+	jp	fsGetB
-	jp	fsPutC
+	jp	fsPutB
 	jp	fsSetSize
 	jp	cpHLDE
 	jp	parseArgs
 	jp	printstr
-	jp	_blkGetC
+	jp	_blkGetB
-	jp	_blkPutC
+	jp	_blkPutB
 	jp	_blkSeek
 	jp	_blkTell
 	jp	printcrlf
@ -48,10 +48,10 @@
 .equ	BLOCKDEV_COUNT		4
 .inc "blockdev.asm"
 ; List of devices
-.dw	fsdevGetC, fsdevPutC
+.dw	fsdevGetB, fsdevPutB
-.dw	stdoutGetC, stdoutPutC
+.dw	stdoutGetB, stdoutPutB
-.dw	stdinGetC, stdinPutC
+.dw	stdinGetB, stdinPutB
-.dw	mmapGetC, mmapPutC
+.dw	mmapGetB, mmapPutB
 .equ	MMAP_START	0xe000
@ -84,8 +84,8 @@ init:
 	; setup stack
 	ld	hl, KERNEL_RAMEND
 	ld	sp, hl
-	ld	hl, emulGetC
+	ld	hl, emulGetB
-	ld	de, emulPutC
+	ld	de, emulPutB
 	call	stdioInit
 	call	fsInit
 	ld	a, 0	; select fsdev
@ -97,17 +97,17 @@ init:
 	ld	(SHELL_CMDHOOK), hl
 	jp	shellLoop
-emulGetC:
+emulGetB:
 	; Blocks until a char is returned
 	in	a, (STDIO_PORT)
 	cp	a		; ensure Z
 	ret
-emulPutC:
+emulPutB:
 	out	(STDIO_PORT), a
 	ret
-fsdevGetC:
+fsdevGetB:
 	ld	a, e
 	out	(FS_ADDR_PORT), a
 	ld	a, h
@ -121,7 +121,7 @@ fsdevGetC:
 	cp	a		; ensure Z
 	ret
-fsdevPutC:
+fsdevPutB:
 	push	af
 	ld	a, e
 	out	(FS_ADDR_PORT), a
@ -142,21 +142,21 @@ fsdevPutC:
 .equ	STDOUT_HANDLE	FS_HANDLES
-stdoutGetC:
+stdoutGetB:
 	ld	ix, STDOUT_HANDLE
-	jp	fsGetC
+	jp	fsGetB
-stdoutPutC:
+stdoutPutB:
 	ld	ix, STDOUT_HANDLE
-	jp	fsPutC
+	jp	fsPutB
 .equ	STDIN_HANDLE	FS_HANDLES+FS_HANDLE_SIZE
-stdinGetC:
+stdinGetB:
 	ld	ix, STDIN_HANDLE
-	jp	fsGetC
+	jp	fsGetB
-stdinPutC:
+stdinPutB:
 	ld	ix, STDIN_HANDLE
-	jp	fsPutC
+	jp	fsPutB
--- a/tools/emul/shell/user.h
+++ b/tools/emul/shell/user.h
@ -19,14 +19,14 @@
 .equ	blkSet			@+3
 .equ	fsFindFN		@+3
 .equ	fsOpen			@+3
-.equ	fsGetC			@+3
+.equ	fsGetB			@+3
-.equ	fsPutC			@+3
+.equ	fsPutB			@+3
 .equ	fsSetSize		@+3
 .equ	cpHLDE			@+3
 .equ	parseArgs		@+3
 .equ	printstr		@+3
-.equ	_blkGetC		@+3
+.equ	_blkGetB		@+3
-.equ	_blkPutC		@+3
+.equ	_blkPutB		@+3
 .equ	_blkSeek		@+3
 .equ	_blkTell		@+3
 .equ	printcrlf		@+3
--- a/tools/emul/zasm/glue.asm
+++ b/tools/emul/zasm/glue.asm
@ -24,11 +24,11 @@ jp	blkSel
 jp	blkSet
 jp	fsFindFN
 jp	fsOpen
-jp	fsGetC
+jp	fsGetB
 jp	cpHLDE
 jp	parseArgs
-jp	_blkGetC
+jp	_blkGetB
-jp	_blkPutC
+jp	_blkPutB
 jp	_blkSeek
 jp	_blkTell
 jp	printstr
@ -40,9 +40,9 @@ jp	printstr
 .equ	BLOCKDEV_COUNT		3
 .inc "blockdev.asm"
 ; List of devices
-.dw	emulGetC, unsetZ
+.dw	emulGetB, unsetZ
-.dw	unsetZ, emulPutC
+.dw	unsetZ, emulPutB
-.dw	fsdevGetC, fsdevPutC
+.dw	fsdevGetB, fsdevPutB
 .equ	STDIO_RAMSTART	BLOCKDEV_RAMEND
 .inc "stdio.asm"
@ -71,7 +71,7 @@ init:
 	.db	"0 1", 0
 ; *** I/O ***
-emulGetC:
+emulGetB:
 	; the STDIN_SEEK port works by poking it twice. First poke is for high
 	; byte, second poke is for low one.
 	ld	a, h
@ -87,7 +87,7 @@ emulGetC:
 	call	unsetZ
 	ret
-emulPutC:
+emulPutB:
 	out	(STDIO_PORT), a
 	cp	a		; ensure Z
 	ret
@ -97,7 +97,7 @@ stderrPutC:
 	cp	a		; ensure Z
 	ret
-fsdevGetC:
+fsdevGetB:
 	ld	a, e
 	out	(FS_SEEK_PORT), a
 	ld	a, h
@ -111,7 +111,7 @@ fsdevGetC:
 	cp	a		; ensure Z
 	ret
-fsdevPutC:
+fsdevPutB:
 	push	af
 	ld	a, e
 	out	(FS_SEEK_PORT), a
--- a/tools/emul/zasm/user.h
+++ b/tools/emul/zasm/user.h
@ -5,25 +5,25 @@
 ; *** JUMP TABLE ***
 .equ    strncmp        0x03
-.equ    addDE          0x06
+.equ    addDE          @+3
-.equ    addHL          0x09
+.equ    addHL          @+3
-.equ    upcase         0x0c
+.equ    upcase         @+3
-.equ    unsetZ         0x0f
+.equ    unsetZ         @+3
-.equ    intoDE         0x12
+.equ    intoDE         @+3
-.equ    intoHL         0x15
+.equ    intoHL         @+3
-.equ    writeHLinDE    0x18
+.equ    writeHLinDE    @+3
-.equ    findchar       0x1b
+.equ    findchar       @+3
-.equ    parseHex       0x1e
+.equ    parseHex       @+3
-.equ    parseHexPair   0x21
+.equ    parseHexPair   @+3
-.equ    blkSel         0x24
+.equ    blkSel         @+3
-.equ    blkSet         0x27
+.equ    blkSet         @+3
-.equ    fsFindFN       0x2a
+.equ    fsFindFN       @+3
-.equ    fsOpen         0x2d
+.equ    fsOpen         @+3
-.equ    fsGetC         0x30
+.equ    fsGetB         @+3
-.equ    cpHLDE         0x33
+.equ    cpHLDE         @+3
-.equ    parseArgs      0x36
+.equ    parseArgs      @+3
-.equ    _blkGetC       0x39
+.equ    _blkGetB       @+3
-.equ    _blkPutC       0x3c
+.equ    _blkPutB       @+3
-.equ    _blkSeek       0x3f
+.equ    _blkSeek       @+3
-.equ    _blkTell       0x42
+.equ    _blkTell       @+3
-.equ    printstr       0x45
+.equ    printstr       @+3
--- a/tools/tests/zasm/test10.asm.expected
+++ b/tools/tests/zasm/test10.asm.expected
@ -9,7 +9,7 @@
 .equ	BLOCKDEV_ERR_OUT_OF_BOUNDS	0x03
 .equ	BLOCKDEV_ERR_UNSUPPORTED	0x04
-; IO routines (GetC, PutC) returned an error in a load/save command
+; IO routines (GetB, PutB) returned an error in a load/save command
 .equ	SHELL_ERR_IO_ERROR	0x05