blk/001

@@ -7,7 +7,7 @@ MASTER INDEX
 200 Z80 assembler             260 Cross compilation
 280 Z80 boot code             350 ACIA driver
 370 SD Card driver            390 Cross-compiled core
-439 Core words                480 AT28 Driver
+428 Core words                480 AT28 Driver
 490 TRS-80 Recipe             520 Fonts
 550 TI-84+ Recipe
 

blk/131

@@ -1,9 +1,9 @@
 ( Relink a regular Forth full interpreter. )
 : RLCORE
-    LIT< [ (find) DROP          ( target )
+    LIT< H@ (find) DROP         ( target )
     DUP 3 - @                   ( t prevoff )
-    ( subtract [ name length )
-    1-                          ( t o )
+    ( subtract H@ name length )
+    2-                          ( t o )
     RLDICT
 ;
 

blk/370

@@ -1,3 +1,3 @@
 SD Card driver
 
-Load range: 372-387
+Load range: 372-381

blk/393

@@ -12,4 +12,4 @@
     0 0x08 RAM+ !  ( 08 == C<* override )
     LIT< INTERPRET (find) DROP EXECUTE
 ;
-1 25 LOADR+ ( xcomp core low )
+1 19 LOADR+

blk/409

@@ -4,13 +4,6 @@
     (find)
     NOT IF (parse) ELSE EXECUTE THEN
     C<? NOT IF LIT< (ok) (find) IF EXECUTE THEN THEN
-    AGAIN ;
-XCURRENT @ _xapply ( to PSP )
-( Drop RSP until I-2 == INTERPRET. )
-: EXIT!
-    [ LITN ]            ( I, from PSP )
-    BEGIN               ( I )
-    DUP                 ( I I )
-    R> DROP I 2- @      ( I I a )
-    = UNTIL
-    DROP ;
+    AGAIN
+;
+

blk/413

@@ -1,13 +0,0 @@
-: '? WORD (find) ;
-: '
-    '? (?br) [ 4 , ] EXIT
-    LIT< (wnf) (find) DROP EXECUTE
-;
-: ROLL
-    DUP NOT IF EXIT THEN
-    1+ DUP PICK          ( n val )
-    SWAP 2 * (roll)      ( val )
-    SWAP DROP
-;
-: 2OVER 3 PICK 3 PICK ;
-: 2SWAP 3 ROLL 3 ROLL ;

blk/415

@@ -1,13 +1 @@
-: WORD(
-    DUP 1- C@   ( name len field )
-    127 AND     ( 0x7f. remove IMMEDIATE flag )
-    3 +         ( fixed header len )
-    -
-;
-: FORGET
-    ' DUP               ( w w )
-    ( HERE must be at the end of prev's word, that is, at the
-      beginning of w. )
-    WORD( HERE !  ( w )
-    PREV CURRENT !
-;
+1 4 LOADR+

blk/416

@@ -1,13 +1,14 @@
-: BLKMEM+ 0x59 RAM+ @ + ;
-( n -- Fetches block n and write it to BLK( )
-: BLK@* 0 BLKMEM+ ;
-( n -- Write back BLK( to storage at block n )
-: BLK!* 2 BLKMEM+ ;
-( Current blk pointer in ( )
-: BLK> 4 BLKMEM+ ;
-( Whether buffer is dirty )
-: BLKDTY 6 BLKMEM+ ;
-: BLK( 8 BLKMEM+ ;
-: BLK) BLK( 1024 + ;
+: EMIT
+    ( 0x53==(emit) override )
+    0x53 RAM+ @ DUP IF EXECUTE ELSE DROP (emit) THEN ;
+
+: (print)
+    BEGIN
+        C@+      ( a+1 c )
+        ( exit if null or 0xd )
+        DUP 0xd = OVER NOT OR IF 2DROP EXIT THEN
+        EMIT     ( a )
+    AGAIN
+;
 
 

blk/417

@@ -1,12 +1,13 @@
-: BLK$
-    H@ 0x59 RAM+ !
-    ( 1024 for the block, 8 for variables )
-    1032 ALLOT
-    ( LOAD detects end of block with ASCII EOT. This is why
-      we write it there. EOT == 0x04 )
-    4 C,
-    0 BLKDTY !
-    -1 BLK> !
-;
+: ,"
+    BEGIN
+        C<
+        ( 34 is ASCII for " )
+        DUP 34 = IF DROP EXIT THEN C,
+    AGAIN ;
 
+: ."
+    34 , ( 34 == litWord ) ," 0 C,
+    COMPILE (print)
+; IMMEDIATE
 
+: ABORT" [COMPILE] ." COMPILE ABORT ; IMMEDIATE

blk/418

@@ -1,13 +1,14 @@
-: BLK! ( -- )
-    BLK> @ BLK!* @ EXECUTE
-    0 BLKDTY !
-;
-: FLUSH BLKDTY @ IF BLK! THEN ;
-: BLK@ ( n -- )
-    FLUSH
-    DUP BLK> @ = IF DROP EXIT THEN
-    DUP BLK> ! BLK@* @ EXECUTE
-;
+( LITN has to be defined after the last immediate usage of
+  it to avoid bootstrapping issues )
+: LITN 32 , , ( 32 == NUMBER ) ;
 
-: BLK!! 1 BLKDTY ! ;
+: IMMED? 1- C@ 0x80 AND ;
+
+( ';' can't have its name right away because, when created, it
+  is not an IMMEDIATE yet and will not be treated properly by
+  xcomp. )
+: _
+    ['] EXIT ,
+    R> DROP     ( exit : )
+; IMMEDIATE
 

blk/419

@@ -0,0 +1,16 @@
+XCURRENT @ ( to PSP )
+: :
+    (entry)
+    ( We cannot use LITN as IMMEDIATE because of bootstrapping
+      issues. Same thing for ",".
+      32 == NUMBER 14 == compiledWord )
+    [ 32 H@ ! 2 ALLOT 14 H@ ! 2 ALLOT ] C,
+    BEGIN
+        WORD
+        (find)
+        ( is word )
+        IF DUP IMMED? IF EXECUTE ELSE , THEN
+        ( maybe number )
+        ELSE (parse) LITN THEN
+    AGAIN ;
+( from PSP ) ';' SWAP 4 - C!

blk/420

@@ -1 +0,0 @@
-1 16 LOADR+ ( xcomp core high )

blk/421

@@ -1,14 +0,0 @@
-: EMIT
-    ( 0x53==(emit) override )
-    0x53 RAM+ @ DUP IF EXECUTE ELSE DROP (emit) THEN ;
-
-: (print)
-    BEGIN
-        C@+      ( a+1 c )
-        ( exit if null or 0xd )
-        DUP 0xd = OVER NOT OR IF 2DROP EXIT THEN
-        EMIT     ( a )
-    AGAIN
-;
-
-

blk/422

@@ -1,15 +0,0 @@
-: ,"
-    BEGIN
-        C<
-        ( 34 is ASCII for " )
-        DUP 34 = IF DROP EXIT THEN C,
-    AGAIN ;
-
-: ."
-    34 , ( 34 == litWord ) ," 0 C,
-    COMPILE (print)
-; IMMEDIATE
-: ABORT" [COMPILE] ." COMPILE ABORT ; IMMEDIATE
-: BS 8 EMIT ; : LF 10 EMIT ; : CR 13 EMIT ;
-: CRLF CR LF ; : SPC 32 EMIT ;
-: NL 0x0a RAM+ @ ( NLPTR ) DUP IF EXECUTE ELSE DROP CRLF THEN ;

blk/423

@@ -1,16 +0,0 @@
-: _
-    999 SWAP        ( stop indicator )
-    DUP 0 = IF '0' EXIT THEN    ( 0 is a special case )
-    BEGIN
-        DUP 0 = IF DROP EXIT THEN
-        10 /MOD         ( r q )
-        SWAP '0' + SWAP ( d q )
-    AGAIN ;
-: . ( n -- )
-    ( handle negative )
-    DUP 0< IF '-' EMIT -1 * THEN
-    _
-    BEGIN
-        DUP '9' > IF DROP EXIT THEN  ( stop indicator )
-        EMIT
-    AGAIN ;

blk/424

@@ -1,16 +0,0 @@
-: ? @ . ;
-: _
-    DUP 9 > IF 10 - 'a' +
-    ELSE '0' + THEN
-;
-( For hex display, there are no negatives )
-: .x
-    256 MOD     ( ensure < 0x100 )
-    16 /MOD     ( l h )
-    _ EMIT      ( l )
-    _ EMIT
-;
-: .X
-    256 /MOD    ( l h )
-    .x .x
-;

blk/425

@@ -1,13 +0,0 @@
-: _ ( a -- a+8 )
-    DUP ( a a )
-    ':' EMIT DUP .x SPC
-    4 0 DO DUP @ 256 /MOD SWAP .x .x SPC 2+ LOOP
-    DROP ( a )
-    8 0 DO
-        C@+ DUP 0x20 0x7e =><= NOT IF DROP '.' THEN EMIT
-    LOOP NL ;
-: DUMP ( n a -- )
-    LF
-    SWAP 8 /MOD SWAP IF 1+ THEN
-    0 DO _ LOOP
-;

blk/428

@@ -1,16 +1,12 @@
-: (rdlnc)                   ( -- f )
-    ( buffer overflow? same as if we typed a newline )
-    IN> @ IN) = IF 0x0a ELSE KEY THEN     ( c )
-    DUP 0x7f = IF DROP 0x8 THEN ( del? same as backspace )
-    DUP 0x0a = IF DROP 0xd THEN ( lf? same as cr )
-    ( echo back )
-    DUP EMIT                    ( c )
-    ( bacspace? handle and exit )
-    DUP 0x8 = IF (inbs) EXIT THEN
-    ( write and advance )
-    DUP     ( keep as result )  ( c c )
-( We take advantage of the fact that c's MSB is always zero and
-  thus ! automatically null-terminates our string )
-    IN> @ ! 1 IN> +!            ( c )
-    ( if newline, replace with zero to indicate EOL )
-    DUP 0xd = IF DROP 0 THEN ;
+Core words
+
+These words follow cross-compiled words, but unlike them, these
+are self-bootstrapping and don't depend on the Cross Compiler.
+They will typically be included in source form right after a
+stage1 binary which will interpret it on boot and bootstrap
+itself to a full intepreter, which can then be relinked with
+the Relinker. There is no loader for these libraries because
+you will typically XPACK (B267) them.
+
+430 core                       442 fmt
+447 readln                     453 blk

blk/430

@@ -1,12 +1,15 @@
-( Initializes the readln subsystem )
-: RDLN$
-    ( 57 == rdln's memory )
-    H@ 0x57 RAM+ !
-    ( plus 2 for extra bytes after buffer: 1 for
-      the last typed 0x0a and one for the following NULL. )
-    IN) IN> - 2+ ALLOT
-    (infl)
-    LIT< RDLN< (find) DROP 0x0c RAM+ !
-    1 0x06 RAM+ !  ( 06 == C<? )
+: [ INTERPRET ; IMMEDIATE
+: ] R> DROP ;
+: LIT< WORD 34 , SCPY 0 C, ; IMMEDIATE
+: LITA 36 , , ;
+: '? WORD (find) ;
+: '
+    '? (?br) [ 4 , ] EXIT
+    LIT< (wnf) (find) DROP EXECUTE
 ;
-
+: ['] ' LITA ; IMMEDIATE
+: COMPILE ' LITA ['] , , ; IMMEDIATE
+: [COMPILE] ' , ; IMMEDIATE
+: BEGIN H@ ; IMMEDIATE
+: AGAIN COMPILE (br) H@ - , ; IMMEDIATE
+: UNTIL COMPILE (?br) H@ - , ; IMMEDIATE

blk/431

@@ -1,13 +1,13 @@
-: .2 DUP 10 < IF SPC THEN . ;
-: EOL? ( c -- f ) DUP 0xd = SWAP NOT OR ;
-: LIST
-    BLK@
-    16 0 DO
-        I 1+ .2 SPC
-        64 I * BLK( + DUP 64 + SWAP DO
-            I C@ DUP EOL? IF DROP LEAVE ELSE EMIT THEN
-        LOOP
-        NL
-    LOOP
-;
+: _ BEGIN LIT< ) WORD S= UNTIL ; IMMEDIATE
+40 CURRENT @ 4 - C!
+( Hello, hello, krkrkrkr... do you hear me?
+  Ah, voice at last! Some lines above need comments
+  BTW: Forth lines limited to 64 cols because of default
+  input buffer size in Collapse OS
 
+  40 is ASCII for '('. We do this to simplify XPACK's task of
+  not mistakenly consider '(' definition as a comment.
+  LIT<: 34 == litWord
+  LITA: 36 == addrWord
+  COMPILE: Tough one. Get addr of caller word (example above
+  (br)) and then call LITA on it. )

blk/432

@@ -1,16 +1,11 @@
-: _
-    (boot<)
-    DUP 4 = IF
-        ( We drop our char, but also "a" from WORD: it won't
-          have the opportunity to balance PSP because we're
-          EXIT!ing. )
-        2DROP
-        ( We're finished interpreting )
-        EXIT!
-    THEN
-;
-XCURRENT @ _xapply ( to PSP, for LOAD )
-( pre-comment for tight LOAD: The 0x08==I check after INTERPRET
-  is to check whether we're restoring to "_", the word above.
-  if yes, then we're in a nested load. Also, the 1 in 0x06 is
-  to avoid tons of "ok" displays. )
+: IF                ( -- a | a: br cell addr )
+    COMPILE (?br)
+    H@              ( push a )
+    2 ALLOT         ( br cell allot )
+; IMMEDIATE
+
+: THEN              ( a -- | a: br cell addr )
+    DUP H@ -^ SWAP   ( a-H a )
+    !
+; IMMEDIATE
+

blk/433

@@ -1,16 +1,12 @@
-: LOAD
-    BLK> @ >R ( save restorable variables to RSP )
-    0x08 RAM+ @ >R  ( 08 == C<* override )
-    0x06 RAM+ @ >R  ( C<? )
-    0x2e RAM+ @ >R  ( boot ptr )
-    BLK@
-    BLK( 0x2e RAM+ ! ( Point to beginning of BLK )
-    [ LITN ( from PSP, B432 ) ]  0x08 RAM+ ! 
-    1 0x06 RAM+ !  ( 06 == C<? )
-    INTERPRET
-    R> 0x2e RAM+ ! R> 0x06 RAM+ !
-    I 0x08 RAM+ @ = IF ( nested load )
-        R> DROP ( C<* ) R> BLK@
-    ELSE ( not nested )
-        R> 0x08 RAM+ ! R> DROP ( BLK> )
-    THEN ;
+: ELSE              ( a1 -- a2 | a1: IF cell a2: ELSE cell )
+    COMPILE (br)
+    2 ALLOT
+    DUP H@ -^ SWAP  ( a-H a )
+    !
+    H@ 2-          ( push a. -2 for allot offset )
+; IMMEDIATE
+
+: [IF]
+    IF EXIT THEN
+    LIT< [THEN] BEGIN DUP WORD S= UNTIL DROP ;
+: [THEN] ;

blk/434

@@ -1,4 +1,14 @@
-: LOAD+ BLK> @ + LOAD ;
-( b1 b2 -- )
-: LOADR 1+ SWAP DO I DUP . NL LOAD LOOP ;
-: LOADR+ BLK> @ + SWAP BLK> @ + SWAP LOADR ;
+: DOES>
+    ( Overwrite cellWord in CURRENT )
+    ( 43 == doesWord )
+    43 CURRENT @ C!
+    ( When we have a DOES>, we forcefully place HERE to 4
+      bytes after CURRENT. This allows a DOES word to use ","
+      and "C," without messing everything up. )
+    CURRENT @ 3 + HERE !
+    ( HERE points to where we should write R> )
+    R> ,
+    ( We're done. Because we've popped RS, we'll exit parent
+      definition )
+;
+

blk/435

@@ -1,14 +1,8 @@
-( LITN has to be defined after the last immediate usage of
-  it to avoid bootstrapping issues )
-: LITN 32 , , ( 32 == NUMBER ) ;
-
-: IMMED? 1- C@ 0x80 AND ;
-
-( ';' can't have its name right away because, when created, it
-  is not an IMMEDIATE yet and will not be treated properly by
-  xcomp. )
-: _
-    ['] EXIT ,
-    R> DROP     ( exit : )
-; IMMEDIATE
+: VARIABLE CREATE 2 ALLOT ;
+: CONSTANT CREATE , DOES> @ ;
 
+( In addition to pushing H@ this compiles 2>R so that loop
+  variables are sent to PS at runtime )
+: DO COMPILE 2>R H@ ; IMMEDIATE
+: LOOP COMPILE (loop) H@ - , ; IMMEDIATE
+( LEAVE is implemented in xcomp )

blk/436

@@ -1,16 +1,11 @@
-XCURRENT @ ( to PSP )
-: :
-    (entry)
-    ( We cannot use LITN as IMMEDIATE because of bootstrapping
-      issues. Same thing for ",".
-      32 == NUMBER 14 == compiledWord )
-    [ 32 H@ ! 2 ALLOT 14 H@ ! 2 ALLOT ] C,
-    BEGIN
-        WORD
-        (find)
-        ( is word )
-        IF DUP IMMED? IF EXECUTE ELSE , THEN
-        ( maybe number )
-        ELSE (parse) LITN THEN
-    AGAIN ;
-( from PSP ) ';' SWAP 4 - C!
+: ROLL
+    DUP NOT IF EXIT THEN
+    1+ DUP PICK          ( n val )
+    SWAP 2 * (roll)      ( val )
+    SWAP DROP
+;
+
+: 2OVER 3 PICK 3 PICK ;
+: 2SWAP 3 ROLL 3 ROLL ;
+
+

blk/438

@@ -0,0 +1,13 @@
+: WORD(
+    DUP 1- C@   ( name len field )
+    127 AND     ( 0x7f. remove IMMEDIATE flag )
+    3 +         ( fixed header len )
+    -
+;
+: FORGET
+    ' DUP               ( w w )
+    ( HERE must be at the end of prev's word, that is, at the
+      beginning of w. )
+    WORD( HERE !  ( w )
+    PREV CURRENT !
+;

blk/439

@@ -1,12 +1,10 @@
-Core words
+( Drop RSP until I-2 == INTERPRET. )
+: EXIT!
+    ['] INTERPRET       ( I )
+    BEGIN               ( I )
+    DUP                 ( I I )
+    R> DROP I 2- @     ( I I a )
+    = UNTIL
+    DROP
+;
 
-These words follow cross-compiled words, but unlike them, these
-are self-bootstrapping and don't depend on the Cross Compiler.
-They will typically be included in source form right after a
-stage1 binary which will interpret it on boot and bootstrap
-itself to a full intepreter, which can then be relinked with
-the Relinker. There is no loader for these libraries because
-you will typically XPACK (B267) them.
-
-440 core                       447 readln                   
-453 blk

blk/440

@@ -1,10 +1,11 @@
-: [ INTERPRET ; IMMEDIATE
-: ] R> DROP ;
-: LIT< WORD 34 , SCPY 0 C, ; IMMEDIATE
-: LITA 36 , , ;
-: ['] ' LITA ; IMMEDIATE
-: COMPILE ' LITA ['] , , ; IMMEDIATE
-: [COMPILE] ' , ; IMMEDIATE
-: BEGIN H@ ; IMMEDIATE
-: AGAIN COMPILE (br) H@ - , ; IMMEDIATE
-: UNTIL COMPILE (?br) H@ - , ; IMMEDIATE
+: (uflw) ABORT" stack underflow" ;
+: BS 8 EMIT ;
+: LF 10 EMIT ;
+: CR 13 EMIT ;
+: CRLF CR LF ;
+: SPC 32 EMIT ;
+: NL 0x0a RAM+ @ ( NLPTR ) DUP IF EXECUTE ELSE DROP CRLF THEN ;
+
+: (wnf) (print) SPC ABORT" word not found" ;
+: (ok) SPC ." ok" NL ;
+

blk/441

@@ -1,13 +0,0 @@
-: _ BEGIN LIT< ) WORD S= UNTIL ; IMMEDIATE
-40 CURRENT @ 4 - C!
-( Hello, hello, krkrkrkr... do you hear me?
-  Ah, voice at last! Some lines above need comments
-  BTW: Forth lines limited to 64 cols because of default
-  input buffer size in Collapse OS
-
-  40 is ASCII for '('. We do this to simplify XPACK's task of
-  not mistakenly consider '(' definition as a comment.
-  LIT<: 34 == litWord
-  LITA: 36 == addrWord
-  COMPILE: Tough one. Get addr of caller word (example above
-  (br)) and then call LITA on it. )

blk/442

@@ -1,11 +1,16 @@
-: IF                ( -- a | a: br cell addr )
-    COMPILE (?br)
-    H@              ( push a )
-    2 ALLOT         ( br cell allot )
-; IMMEDIATE
-
-: THEN              ( a -- | a: br cell addr )
-    DUP H@ -^ SWAP   ( a-H a )
-    !
-; IMMEDIATE
-
+: _
+    999 SWAP        ( stop indicator )
+    DUP 0 = IF '0' EXIT THEN    ( 0 is a special case )
+    BEGIN
+        DUP 0 = IF DROP EXIT THEN
+        10 /MOD         ( r q )
+        SWAP '0' + SWAP ( d q )
+    AGAIN ;
+: . ( n -- )
+    ( handle negative )
+    DUP 0< IF '-' EMIT -1 * THEN
+    _
+    BEGIN
+        DUP '9' > IF DROP EXIT THEN  ( stop indicator )
+        EMIT
+    AGAIN ;

blk/443

@@ -1,12 +1,16 @@
-: ELSE              ( a1 -- a2 | a1: IF cell a2: ELSE cell )
-    COMPILE (br)
-    2 ALLOT
-    DUP H@ -^ SWAP  ( a-H a )
-    !
-    H@ 2-          ( push a. -2 for allot offset )
-; IMMEDIATE
-
-: [IF]
-    IF EXIT THEN
-    LIT< [THEN] BEGIN DUP WORD S= UNTIL DROP ;
-: [THEN] ;
+: ? @ . ;
+: _
+    DUP 9 > IF 10 - 'a' +
+    ELSE '0' + THEN
+;
+( For hex display, there are no negatives )
+: .x
+    256 MOD     ( ensure < 0x100 )
+    16 /MOD     ( l h )
+    _ EMIT      ( l )
+    _ EMIT
+;
+: .X
+    256 /MOD    ( l h )
+    .x .x
+;

blk/444

@@ -1,14 +1,16 @@
-: DOES>
-    ( Overwrite cellWord in CURRENT )
-    ( 43 == doesWord )
-    43 CURRENT @ C!
-    ( When we have a DOES>, we forcefully place HERE to 4
-      bytes after CURRENT. This allows a DOES word to use ","
-      and "C," without messing everything up. )
-    CURRENT @ 3 + HERE !
-    ( HERE points to where we should write R> )
-    R> ,
-    ( We're done. Because we've popped RS, we'll exit parent
-      definition )
+: _ ( a -- a+8 )
+    DUP         ( save for 2nd loop )
+    ':' EMIT DUP .x SPC
+    4 0 DO
+        DUP @ 256 /MOD SWAP
+        .x .x SPC 2+
+    LOOP
+    DROP
+    8 0 DO
+        C@+
+        DUP 0x20 0x7e =><= NOT
+        IF DROP '.' THEN
+        EMIT
+    LOOP
+    NL
 ;
-

blk/445

@@ -1,8 +1,6 @@
-: VARIABLE CREATE 2 ALLOT ;
-: CONSTANT CREATE , DOES> @ ;
+: DUMP ( n a -- )
+    LF
+    SWAP 8 /MOD SWAP IF 1+ THEN
+    0 DO _ LOOP
+;
 
-( In addition to pushing H@ this compiles 2>R so that loop
-  variables are sent to PS at runtime )
-: DO COMPILE 2>R H@ ; IMMEDIATE
-: LOOP COMPILE (loop) H@ - , ; IMMEDIATE
-( LEAVE is implemented in xcomp )

blk/446

@@ -1,3 +0,0 @@
-: (ok) SPC ." ok" NL ;
-: (uflw) ABORT" stack underflow" ;
-: (wnf) (print) SPC ABORT" word not found" ;

blk/447

@@ -1,10 +1,11 @@
+64 CONSTANT INBUFSZ
 : RDLNMEM+ 0x57 RAM+ @ + ;
 ( current position in INBUF )
 : IN> 0 RDLNMEM+ ;
 ( points to INBUF )
 : IN( 2 RDLNMEM+ ;
 ( points to INBUF's end )
-: IN) 0x40 ( buffer size ) 2+ RDLNMEM+ ;
+: IN) INBUFSZ 2+ RDLNMEM+ ;
 
 ( flush input buffer )
 ( set IN> to IN( and set IN> @ to null )

blk/449

@@ -0,0 +1,16 @@
+: (rdlnc)                   ( -- f )
+    ( buffer overflow? same as if we typed a newline )
+    IN> @ IN) = IF 0x0a ELSE KEY THEN     ( c )
+    DUP 0x7f = IF DROP 0x8 THEN ( del? same as backspace )
+    DUP 0x0a = IF DROP 0xd THEN ( lf? same as cr )
+    ( echo back )
+    DUP EMIT                    ( c )
+    ( bacspace? handle and exit )
+    DUP 0x8 = IF (inbs) EXIT THEN
+    ( write and advance )
+    DUP     ( keep as result )  ( c c )
+( We take advantage of the fact that c's MSB is always zero and
+  thus ! automatically null-terminates our string )
+    IN> @ ! 1 IN> +!            ( c )
+    ( if newline, replace with zero to indicate EOL )
+    DUP 0xd = IF DROP 0 THEN ;

blk/451

@@ -0,0 +1,12 @@
+( Initializes the readln subsystem )
+: RDLN$
+    ( 57 == rdln's memory )
+    H@ 0x57 RAM+ !
+    ( 2 for IN>, plus 2 for extra bytes after buffer: 1 for
+      the last typed 0x0a and one for the following NULL. )
+    INBUFSZ 4 + ALLOT
+    (infl)
+    ['] RDLN< 0x0c RAM+ !
+    1 0x06 RAM+ !  ( 06 == C<? )
+;
+

blk/453

@@ -0,0 +1,13 @@
+: BLKMEM+ 0x59 RAM+ @ + ;
+( n -- Fetches block n and write it to BLK( )
+: BLK@* 0 BLKMEM+ ;
+( n -- Write back BLK( to storage at block n )
+: BLK!* 2 BLKMEM+ ;
+( Current blk pointer in ( )
+: BLK> 4 BLKMEM+ ;
+( Whether buffer is dirty )
+: BLKDTY 6 BLKMEM+ ;
+: BLK( 8 BLKMEM+ ;
+: BLK) BLK( 1024 + ;
+
+

blk/454

@@ -0,0 +1,12 @@
+: BLK$
+    H@ 0x59 RAM+ !
+    ( 1024 for the block, 8 for variables )
+    1032 ALLOT
+    ( LOAD detects end of block with ASCII EOT. This is why
+      we write it there. EOT == 0x04 )
+    4 C,
+    0 BLKDTY !
+    -1 BLK> !
+;
+
+

blk/455

@@ -0,0 +1,13 @@
+: BLK! ( -- )
+    BLK> @ BLK!* @ EXECUTE
+    0 BLKDTY !
+;
+: FLUSH BLKDTY @ IF BLK! THEN ;
+: BLK@ ( n -- )
+    FLUSH
+    DUP BLK> @ = IF DROP EXIT THEN
+    DUP BLK> ! BLK@* @ EXECUTE
+;
+
+: BLK!! 1 BLKDTY ! ;
+

blk/456

@@ -0,0 +1,13 @@
+: .2 DUP 10 < IF SPC THEN . ;
+: EOL? ( c -- f ) DUP 0xd = SWAP NOT OR ;
+: LIST
+    BLK@
+    16 0 DO
+        I 1+ .2 SPC
+        64 I * BLK( + DUP 64 + SWAP DO
+            I C@ DUP EOL? IF DROP LEAVE ELSE EMIT THEN
+        LOOP
+        NL
+    LOOP
+;
+

blk/457

@@ -0,0 +1,16 @@
+: _
+    (boot<)
+    DUP 4 = IF
+        ( We drop our char, but also "a" from WORD: it won't
+          have the opportunity to balance PSP because we're
+          EXIT!ing. )
+        2DROP
+        ( We're finished interpreting )
+        EXIT!
+    THEN
+;
+
+( pre-comment for tight LOAD: The 0x08==I check after INTERPRET
+  is to check whether we're restoring to "_", the word above.
+  if yes, then we're in a nested load. Also, the 1 in 0x06 is
+  to avoid tons of "ok" displays. )

blk/458

@@ -0,0 +1,16 @@
+: LOAD
+    BLK> @ >R ( save restorable variables to RSP )
+    0x08 RAM+ @ >R
+    0x06 RAM+ @ >R  ( C<? )
+    0x2e RAM+ @ >R  ( boot ptr )
+    BLK@
+    BLK( 0x2e RAM+ ! ( Point to beginning of BLK )
+    ['] _ 0x08 RAM+ ! ( 08 == C<* override )
+    1 0x06 RAM+ !  ( 06 == C<? )
+    INTERPRET
+    R> 0x2e RAM+ ! R> 0x06 RAM+ !
+    I 0x08 RAM+ @ = IF ( nested load )
+        R> DROP ( C<* ) R> BLK@
+    ELSE ( not nested )
+        R> 0x08 RAM+ ! R> DROP ( BLK> )
+    THEN ;

blk/459

@@ -0,0 +1,4 @@
+: LOAD+ BLK> @ + LOAD ;
+( b1 b2 -- )
+: LOADR 1+ SWAP DO I DUP . NL LOAD LOOP ;
+: LOADR+ BLK> @ + SWAP BLK> @ + SWAP LOADR ;

emul/xcomp.fs

@@ -13,15 +13,15 @@
 CURRENT @ XCURRENT !
 
 282 LOAD  ( boot.z80 )
-393 LOAD  ( xcomp core low )
+393 LOAD  ( icore low )
 : (emit) 0 PC! ;
 : (key) 0 PC@ ;
-420 LOAD  ( xcomp core high )
+415 LOAD  ( icore high )
 (entry) _
 ( Update LATEST )
 PC ORG @ 8 + !
 ," CURRENT @ HERE ! "
-440 446 XPACKR
+430 459 XPACKR
 ," ' (key) 12 RAM+ ! "
 ORG @ 256 /MOD 2 PC! 2 PC!
 H@ 256 /MOD 2 PC! 2 PC!

recipes/rc2014/sdcard/README.md

@@ -19,6 +19,7 @@ design.
 ## Gathering parts
 
 * A RC2014 Classic
+* `stage2.bin` from the base recipe
 * A MicroSD breakout board. I use Adafruit's.
 * A proto board + header pins with 39 positions so we can make a RC2014 card.
 * Diodes, resistors and stuff
@@ -68,30 +69,12 @@ matter. However, it *does* matter for the `SELECT` line, so I don't follow my
 own schematic with regards to the `M1` and `A2` lines and use two inverters
 instead.
 
-## Building your binary
+## Building your stage 3
 
-Your Collapse OS binary needs the SDC drivers which need to be inserted during
-Cross Compilation, which needs you need to recompile it from stage 1. First,
-look at B370. You'll see that it indicates a block range for the driver. That
-needs to be loaded.
-
-Open xcomp.fs from base recipe and locate acia loading. You'll insert a line
-right after that that will look like:
-
-    372 387 LOADR  ( sdc )
-
-Normally, that's all you need to do. However, you have a little problem: You're
-busting the 8K ROM limit. But it's ok, you can remove the linker's XPACKing
-line: because you'll have access to the blkfs from SD card, you can load it
-from there!
-
-Removing the linker from XPACKing will free enough space for your binary to fit
-in 8K. You also have to add `BLK$` to initialization routine.
-
-Build it and write it to EEPROM.
-
-If you want, once you're all set with the SD card, you can relink core words
-like you did in the base recipe for optimal resource usage.
+Using the same technique as you used in the `eeprom` recipe, you can append
+required words to your boot binary. There's only one required unit: `blk` from
+core words (B453). The SD card driver was already included in the base recipe
+to save you the troubles of rebuilding from stage 1 for this recipe.
 
 ## Testing in the emulator
 

recipes/rc2014/xcomp.fs

@@ -20,13 +20,14 @@ RAMSTART 0x70 + CONSTANT ACIA_MEM
 CURRENT @ XCURRENT !
 
 282 LOAD  ( boot.z80 )
-393 LOAD  ( xcomp core low )
+393 LOAD  ( icore low )
 352 LOAD  ( acia )
-420 LOAD  ( xcomp core high )
+372 381 LOADR  ( sdc )
+415 LOAD  ( icore high )
 (entry) _
 ( Update LATEST )
 PC ORG @ 8 + !
-440 446 XPACKR ( core )
+430 452 XPACKR ( core fmt readln )
 123 132 XPACKR ( linker )
 ," : _ ACIA$ RDLN$ (ok) ; _ "
 ORG @ 256 /MOD 2 PC! 2 PC!

recipes/ti84/xcomp.fs

@@ -66,15 +66,15 @@ CURRENT @ XCURRENT !
 
 0x100 BIN( !
 282 LOAD  ( boot.z80 )
-393 LOAD  ( xcomp core low )
+393 LOAD  ( icore low )
 CREATE ~FNT CPFNT3x5
 555 560 LOADR ( LCD low )
 566 570 LOADR ( KBD low )
-420 LOAD  ( xcomp core high )
+415 LOAD  ( icore high )
 (entry) _
 ( Update LATEST )
 PC ORG @ 8 + !
-440 446 XPACKR ( core )
+430 451 XPACKR ( core fmt readln )
 ," : _ LCD$ KBD$ (ok) RDLN$ ; _ "
 ORG @ 0x100 - 256 /MOD 2 PC! 2 PC!
 H@ 256 /MOD 2 PC! 2 PC!

recipes/trs80/xcomp.fs

@@ -15,13 +15,13 @@ CURRENT @ XCURRENT !
 0x3000 BIN( !
 282 LOAD  ( boot.z80 )
 492 LOAD  ( trs80.z80 )
-393 LOAD  ( xcomp core low )
-420 LOAD  ( xcomp core high )
+393 LOAD  ( icore low )
+415 LOAD  ( icore high )
 (entry) _
 ( Update LATEST )
 PC ORG @ 8 + !
 ," CURRENT @ HERE ! "
-440 446 XPACKR ( core )
+430 459 XPACKR ( core readln fmt blk )
 499 500 XPACKR ( trs80.fs )
 ( 0x0a == NLPTR. TRS-80 wants CR-only newlines )
 ," : _ ['] CR 0x0a RAM+ ! BLK$ FD$ (ok) RDLN$ ; _ "