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2
blk/001
2
blk/001
@ -6,7 +6,7 @@ MASTER INDEX
|
||||
150 Extra words
|
||||
200 Z80 assembler 260 Cross compilation
|
||||
280 Z80 boot code 350 Core words
|
||||
410 PS/2 keyboard subsystem 420 Bootstrap guide
|
||||
410 PS/2 keyboard subsystem
|
||||
490 TRS-80 Recipe 520 Fonts
|
||||
550 TI-84+ Recipe 580 RC2014 Recipe
|
||||
620 Sega Master System Recipe
|
||||
|
2
blk/003
2
blk/003
@ -13,4 +13,4 @@ Contents
|
||||
4 Number literals 6 Compilation vs meta-comp.
|
||||
8 Interpreter I/O 11 Signed-ness
|
||||
14 Addressed devices 17 DOES>
|
||||
18 Disk blocks 21 How blocks are organized
|
||||
18 Disk blocks
|
||||
|
13
blk/021
13
blk/021
@ -1,13 +0,0 @@
|
||||
How blocks are organized
|
||||
|
||||
Organization of contiguous blocks is an ongoing challenge and
|
||||
Collapse OS' blocks are never as tidy as they should, but we
|
||||
try to strive towards a few goals:
|
||||
|
||||
1. Block 0 contains documentation discovery core keys to the
|
||||
uninitiated.
|
||||
2. First section (up to B100) is usage documentation.
|
||||
3. B100-B200 are for runtime usage utilities
|
||||
4. B200-B500 are for bootstrapping
|
||||
5. The rest is for recipes.
|
||||
6. I'm not sure yet how I'll organize multiple arches.
|
2
blk/414
2
blk/414
@ -10,6 +10,6 @@
|
||||
DUP 0x7f > IF DROP (key) EXIT THEN
|
||||
DUP _shift? IF DROP 1 PS2_SHIFT C! (key) EXIT THEN
|
||||
( ah, finally, we have a gentle run-of-the-mill KC )
|
||||
PS2_CODES PS2_SHIFT C@ IF 0x80 + THEN + C@
|
||||
PS2_CODES PS2_SHIFT @ IF 0x80 + THEN + C@
|
||||
DUP NOT IF DROP (key) THEN ;
|
||||
|
||||
|
16
blk/420
16
blk/420
@ -1,16 +0,0 @@
|
||||
Bootstrap guide
|
||||
|
||||
You want to deploy Collapse OS on a new system? Start here.
|
||||
|
||||
What is Collapse OS? It is a binary placed either in ROM on
|
||||
in RAM by a bootloader. That binary, when executed, initializes
|
||||
itself to a Forth interpreter. In most cases, that Forth
|
||||
interpreter will have some access to a mass storage device,
|
||||
which allows it to access Collapse OS' disk blocks and come
|
||||
to this block to bootstrap itself some more.
|
||||
|
||||
This binary can be separated in 5 distinct layers:
|
||||
1. Boot code (B280)
|
||||
2. Boot words (B305)
|
||||
3. Core words (low) (B350)
|
||||
4. Drivers (cont.)
|
16
blk/421
16
blk/421
@ -1,16 +0,0 @@
|
||||
5. Core words (high)
|
||||
|
||||
Boot code (B280)
|
||||
|
||||
This part contains core routines that underpins Forth fundamen-
|
||||
tal structures: dict navigation and search, PSP/RSP bounds
|
||||
checks, word types (atom, native, literals, "does type"), etc.
|
||||
|
||||
It also of course does core initialization: set RSP/PSP, HERE
|
||||
CURRENT, then find BOOT and call it (see B89).
|
||||
|
||||
It also contains what we call the "stable ABI" in its first
|
||||
0x100 bytes. The beginning og the dict is intertwined in this
|
||||
layer because EXIT, (br), (?br) and (loop) are part of the
|
||||
stable ABI.
|
||||
(cont.)
|
16
blk/422
16
blk/422
@ -1,16 +0,0 @@
|
||||
Boot words (B305)
|
||||
|
||||
Then come the implementation of core Forth words in native
|
||||
assembly. Performance is not Collapse OS' primary design goal,
|
||||
so we try to keep this section to a minimum: we much prefer
|
||||
to implement our words in Forth.
|
||||
|
||||
However, some words are in this section for performance
|
||||
reasons. Sometimes, the gain is too great to pass up.
|
||||
|
||||
Core words (low) (B350)
|
||||
|
||||
Then comes the part where we begin defining words in Forth.
|
||||
Core words are designed to be cross-compiled (B260), from a
|
||||
full Forth interpreter. This means that it has access to more
|
||||
than boot words. This somes with tricky limitations. (cont.)
|
16
blk/423
16
blk/423
@ -1,16 +0,0 @@
|
||||
See B260 for details.
|
||||
|
||||
Drivers
|
||||
|
||||
Up until now, we haven't implemented EMIT or KEY yet: those
|
||||
words are defined in the "high" part of core words because we
|
||||
generally need machine-specific drivers to implement (emit) and
|
||||
(key).
|
||||
|
||||
Well, now is their time to shine. We split core in two
|
||||
precisely to fit drivers in there. This way. they have access
|
||||
to a pretty good vocabulary and they're also give the oppor-
|
||||
tunity to provide (emit) and (key).
|
||||
|
||||
|
||||
(cont.)
|
16
blk/424
16
blk/424
@ -1,16 +0,0 @@
|
||||
Core words (high) (B350)
|
||||
|
||||
Then come EMIT, KEY and everything that depend on it, until
|
||||
we have a full Forth interpreter. At the very end, we define
|
||||
tricky IMMEDIATEs that, if defined earlier, would break cross
|
||||
compilation.
|
||||
|
||||
We end that with a hook words which is also where CURRENT will
|
||||
be on boot.
|
||||
|
||||
So that's the anatomy of a Collapse OS binary. How do you build
|
||||
one? If your machine is already covered by a recipe, you're in
|
||||
luck: follow instructions.
|
||||
|
||||
If you're deploying to a new machine, you'll have to write a
|
||||
new xcomp (cross compilation) unit. Let's look at its (cont.)
|
16
blk/425
16
blk/425
@ -1,16 +0,0 @@
|
||||
anatomy. First, we have constants. Some of them are device-
|
||||
specific, but some of them are always there. RAMSTART is the
|
||||
address at which the RAM starts on the system. System variables
|
||||
will go there and HERE will go after it.
|
||||
|
||||
RS_ADDR is where RSP starts and PS_ADDR is where PSP starts.
|
||||
RSP and PSP are designed to be contiguous. RSP goes up and PSP
|
||||
goes down. If they meet, we know we have a stack overflow.
|
||||
|
||||
Then, we load the assembler and cross compilation unit, which
|
||||
will be needed for the task ahead.
|
||||
|
||||
Then, it's a matter of adding layer after layer. For most
|
||||
system, all those layers except the drivers will be added the
|
||||
same way. Drivers are a bit tricker and machine specific. I
|
||||
can't help you there, you'll have to use your wits. (cont.)
|
15
blk/426
15
blk/426
@ -1,15 +0,0 @@
|
||||
After we've loaded the high part of the core words, we're at
|
||||
the "wrapping up" part. We add what we call a "hook word" (an
|
||||
empty word with a single letter name) which doesn't cost us
|
||||
much and can be very useful if we need to augment the binary
|
||||
with more words, and at that point we have our future boot
|
||||
CURRENT, which PC yields. That is why we write it to the
|
||||
LATEST field of the stable ABI: This value will be used at
|
||||
boot.
|
||||
|
||||
After the last word of the dictionary comes the "source init"
|
||||
part. The boot sequence is designed to interpret whatever comes
|
||||
after LATEST as Forth source, and this, until it reads ASCII
|
||||
EOT character (4). This is generally used for driver init.
|
||||
|
||||
Good luck!
|
27
recipes/rc2014/ps2/Makefile
Normal file
27
recipes/rc2014/ps2/Makefile
Normal file
@ -0,0 +1,27 @@
|
||||
PROGNAME = ps2ctl
|
||||
AVRDUDEMCU ?= t45
|
||||
AVRDUDEARGS ?= -c usbtiny -P usb
|
||||
TARGETS = $(PROGNAME).hex os.bin
|
||||
BASEDIR = ../../..
|
||||
ZASM = $(BASEDIR)/emul/zasm/zasm
|
||||
KERNEL = $(BASEDIR)/kernel
|
||||
APPS = $(BASEDIR)/apps
|
||||
|
||||
# Rules
|
||||
|
||||
.PHONY: send all clean
|
||||
|
||||
all: $(TARGETS)
|
||||
@echo Done!
|
||||
|
||||
send: $(PROGNAME).hex
|
||||
avrdude $(AVRDUDEARGS) -p $(AVRDUDEMCU) -U flash:w:$(PROGNAME).hex
|
||||
|
||||
$(PROGNAME).hex: $(PROGNAME).asm
|
||||
avra -o $@ $(PROGNAME).asm
|
||||
|
||||
os.bin: glue.asm
|
||||
$(ZASM) $(KERNEL) $(APPS) < glue.asm > $@
|
||||
|
||||
clean:
|
||||
rm -f $(TARGETS) *.eep.hex *.obj os.bin
|
@ -61,23 +61,10 @@ probably have gone the flip-flop way. Seems more solid.
|
||||
|
||||
## Using the PS/2 interface
|
||||
|
||||
To use this interface, you have to build a new Collapse OS binary. We'll use
|
||||
the xcomp unit from the base recipe and modify it.
|
||||
After having built and flashed the `glue.asm` supplied with this recipe, you end
|
||||
up with a shell driven by the PS/2 keyboard (but it still outputs to ACIA).
|
||||
|
||||
First, we need a `(ps2kc)` routine. In this case, it's easy, it's
|
||||
`: (ps2kc) 8 PC@ ;`. Add this after ACIA loading. Then, we can load PS/2
|
||||
subsystem. You add `411 414 LOADR`. Then, at initialization, you add `PS2$`
|
||||
after `ACIA$`. You also need to define `PS2_MEM` at the top. You can probably
|
||||
use `RAMSTART + 0x7a`.
|
||||
|
||||
Rebuild, reflash, should work. For debugging purposes, you might not want to
|
||||
go straight to plugging PS/2 `(key)` into the system. What I did myself was
|
||||
to load the PS/2 subsystem *before* ACIA (which overrides with its own `(key)`)
|
||||
and added a dummy word in between to access PS/2's key.
|
||||
|
||||
Also (and this is a TODO: investigate), I had a problem where the break key I
|
||||
got from `(ps2kc)` was 0x70 instead of 0xf0 which had the effect of duplicating
|
||||
all my keystrokes. I added a 0x70 -> 0xf0 replacement in my version of
|
||||
`(ps2kc)`. Does the trick (at the cost of a non-functional numpad 0).
|
||||
There are still a few glitches, especially at initialization or at connect and
|
||||
disconnect, but it otherwise works rather well!
|
||||
|
||||
[avra]: https://github.com/hsoft/avra
|
||||
|
59
recipes/rc2014/ps2/glue.asm
Normal file
59
recipes/rc2014/ps2/glue.asm
Normal file
@ -0,0 +1,59 @@
|
||||
.equ RAMSTART 0x8000
|
||||
.equ RAMEND 0xffff
|
||||
.equ ACIA_CTL 0x80 ; Control and status. RS off.
|
||||
.equ ACIA_IO 0x81 ; Transmit. RS on.
|
||||
.equ KBD_PORT 0x08
|
||||
|
||||
jp init
|
||||
|
||||
.inc "err.h"
|
||||
.inc "ascii.h"
|
||||
.inc "core.asm"
|
||||
.inc "str.asm"
|
||||
.equ ACIA_RAMSTART RAMSTART
|
||||
.inc "acia.asm"
|
||||
|
||||
.equ KBD_RAMSTART ACIA_RAMEND
|
||||
.inc "kbd.asm"
|
||||
|
||||
.equ STDIO_RAMSTART KBD_RAMEND
|
||||
.equ STDIO_GETC kbdGetC
|
||||
.equ STDIO_PUTC aciaPutC
|
||||
.inc "stdio.asm"
|
||||
|
||||
; *** BASIC ***
|
||||
|
||||
; RAM space used in different routines for short term processing.
|
||||
.equ SCRATCHPAD_SIZE STDIO_BUFSIZE
|
||||
.equ SCRATCHPAD STDIO_RAMEND
|
||||
.inc "lib/util.asm"
|
||||
.inc "lib/ari.asm"
|
||||
.inc "lib/parse.asm"
|
||||
.inc "lib/fmt.asm"
|
||||
.equ EXPR_PARSE parseLiteralOrVar
|
||||
.inc "lib/expr.asm"
|
||||
.inc "basic/util.asm"
|
||||
.inc "basic/parse.asm"
|
||||
.inc "basic/tok.asm"
|
||||
.equ VAR_RAMSTART SCRATCHPAD+SCRATCHPAD_SIZE
|
||||
.inc "basic/var.asm"
|
||||
.equ BUF_RAMSTART VAR_RAMEND
|
||||
.inc "basic/buf.asm"
|
||||
.equ BAS_RAMSTART BUF_RAMEND
|
||||
.inc "basic/main.asm"
|
||||
|
||||
init:
|
||||
di
|
||||
ld sp, RAMEND
|
||||
im 1
|
||||
|
||||
call aciaInit
|
||||
call kbdInit
|
||||
call basInit
|
||||
ei
|
||||
jp basStart
|
||||
|
||||
KBD_FETCHKC:
|
||||
in a, (KBD_PORT)
|
||||
ret
|
||||
|
@ -18,6 +18,7 @@ This recipe is for installing a minimal Collapse OS system on the SMS. There
|
||||
are other recipes related to the SMS:
|
||||
|
||||
* [Interfacing a PS/2 keyboard](kbd/README.md)
|
||||
* [zasm and ed from ROM](romasm/README.md)
|
||||
|
||||
## Gathering parts
|
||||
|
||||
|
69
recipes/sms/glue.asm
Normal file
69
recipes/sms/glue.asm
Normal file
@ -0,0 +1,69 @@
|
||||
; 8K of onboard RAM
|
||||
.equ RAMSTART 0xc000
|
||||
; Memory register at the end of RAM. Must not overwrite
|
||||
.equ RAMEND 0xfdd0
|
||||
|
||||
jp init
|
||||
|
||||
.fill 0x66-$
|
||||
retn
|
||||
|
||||
.inc "err.h"
|
||||
.inc "ascii.h"
|
||||
.inc "core.asm"
|
||||
.inc "str.asm"
|
||||
|
||||
.equ PAD_RAMSTART RAMSTART
|
||||
.inc "sms/pad.asm"
|
||||
|
||||
.inc "sms/vdp.asm"
|
||||
.equ GRID_RAMSTART PAD_RAMEND
|
||||
.equ GRID_COLS VDP_COLS
|
||||
.equ GRID_ROWS VDP_ROWS
|
||||
.equ GRID_SETCELL vdpSetCell
|
||||
.equ GRID_GETC padGetC
|
||||
.inc "grid.asm"
|
||||
|
||||
.equ STDIO_RAMSTART GRID_RAMEND
|
||||
.equ STDIO_GETC gridGetC
|
||||
.equ STDIO_PUTC gridPutC
|
||||
.inc "stdio.asm"
|
||||
|
||||
; *** BASIC ***
|
||||
|
||||
; RAM space used in different routines for short term processing.
|
||||
.equ SCRATCHPAD_SIZE STDIO_BUFSIZE
|
||||
.equ SCRATCHPAD STDIO_RAMEND
|
||||
.inc "lib/util.asm"
|
||||
.inc "lib/ari.asm"
|
||||
.inc "lib/parse.asm"
|
||||
.inc "lib/fmt.asm"
|
||||
.equ EXPR_PARSE parseLiteralOrVar
|
||||
.inc "lib/expr.asm"
|
||||
.inc "basic/util.asm"
|
||||
.inc "basic/parse.asm"
|
||||
.inc "basic/tok.asm"
|
||||
.equ VAR_RAMSTART SCRATCHPAD+SCRATCHPAD_SIZE
|
||||
.inc "basic/var.asm"
|
||||
.equ BUF_RAMSTART VAR_RAMEND
|
||||
.inc "basic/buf.asm"
|
||||
.equ BAS_RAMSTART BUF_RAMEND
|
||||
.inc "basic/main.asm"
|
||||
|
||||
init:
|
||||
di
|
||||
im 1
|
||||
|
||||
ld sp, RAMEND
|
||||
|
||||
call gridInit
|
||||
call padInit
|
||||
call vdpInit
|
||||
call basInit
|
||||
jp basStart
|
||||
|
||||
FNT_DATA:
|
||||
.bin "fnt/7x7.bin"
|
||||
|
||||
.fill 0x7ff0-$
|
||||
.db "TMR SEGA", 0x00, 0x00, 0xfb, 0x68, 0x00, 0x00, 0x00, 0x4c
|
22
recipes/sms/kbd/Makefile
Normal file
22
recipes/sms/kbd/Makefile
Normal file
@ -0,0 +1,22 @@
|
||||
PROGNAME = ps2ctl
|
||||
AVRDUDEMCU ?= t45
|
||||
AVRDUDEARGS ?= -c usbtiny -P usb
|
||||
TARGETS = $(PROGNAME).bin
|
||||
BASEDIR = ../../..
|
||||
EDIR = $(BASEDIR)/emul
|
||||
|
||||
# Rules
|
||||
|
||||
.PHONY: send all clean
|
||||
|
||||
all: $(TARGETS)
|
||||
@echo Done!
|
||||
|
||||
send: $(PROGNAME).bin
|
||||
avrdude $(AVRDUDEARGS) -p $(AVRDUDEMCU) -U flash:w:$(PROGNAME).bin
|
||||
|
||||
$(PROGNAME).bin: $(PROGNAME).fs
|
||||
cd $(EDIR) && ./avra.sh < ../recipes/sms/kbd/$(PROGNAME).fs > ../recipes/sms/kbd/$@
|
||||
|
||||
clean:
|
||||
rm -f $(TARGETS)
|
@ -100,16 +100,16 @@ The code expects a SR-latch that works like a 4043, that is, S and R are
|
||||
triggered high, S makes Q high, R makes Q low. R is hooked to PB4. S is hooked
|
||||
to TH (and also the A/B on the '157). Q is hooked to PB0 and TL.
|
||||
|
||||
## Building the binary
|
||||
## Usage
|
||||
|
||||
We start with the base recipe and add a few things:
|
||||
The code in this recipe is set up to listen to the keyboard on port B, leaving
|
||||
port A to drive, for example, an Everdrive with a D-pad. Unlike the generic
|
||||
SMS recipe, this kernel has no character selection mechanism. It acts like a
|
||||
regular shell, taking input from the keyboard.
|
||||
|
||||
1. at the top: `RAMSTART 0x72 + CONSTANT PS2_MEM`
|
||||
2. After VDP load: `641 LOAD : (ps2kc) (ps2kcB) ;` (that binds us to port B)
|
||||
3. Right after: `411 414 LOADR` (that gives us `(key)`)
|
||||
4. After `VDP$`: `PS2$`.
|
||||
`kernel/sms/kbd.asm` also has a FetchKC implementation for port A if you prefer.
|
||||
Just hook it on. I've tried it, it works.
|
||||
|
||||
Rebuild, send to SMS, then run with your keyboard interface plugged to PortB.
|
||||
It should mostly work. There are still a few glitches to iron out...
|
||||
Did you get there? Feels pretty cool huh?
|
||||
|
||||
[rc2014-ps2]: ../../rc2014/ps2
|
||||
|
82
recipes/sms/kbd/glue.asm
Normal file
82
recipes/sms/kbd/glue.asm
Normal file
@ -0,0 +1,82 @@
|
||||
; 8K of onboard RAM
|
||||
.equ RAMSTART 0xc000
|
||||
; Memory register at the end of RAM. Must not overwrite
|
||||
.equ RAMEND 0xddd0
|
||||
|
||||
jp init
|
||||
|
||||
.fill 0x66-$
|
||||
retn
|
||||
|
||||
.inc "err.h"
|
||||
.inc "ascii.h"
|
||||
.inc "core.asm"
|
||||
.inc "str.asm"
|
||||
|
||||
.inc "sms/kbd.asm"
|
||||
.equ KBD_RAMSTART RAMSTART
|
||||
.equ KBD_FETCHKC smskbdFetchKCB
|
||||
.inc "kbd.asm"
|
||||
|
||||
.inc "sms/vdp.asm"
|
||||
.equ GRID_RAMSTART KBD_RAMEND
|
||||
.equ GRID_COLS VDP_COLS
|
||||
.equ GRID_ROWS VDP_ROWS
|
||||
.equ GRID_SETCELL vdpSetCell
|
||||
.equ GRID_GETC kbdGetC
|
||||
.inc "grid.asm"
|
||||
|
||||
.equ STDIO_RAMSTART GRID_RAMEND
|
||||
.equ STDIO_GETC gridGetC
|
||||
.equ STDIO_PUTC gridPutC
|
||||
.inc "stdio.asm"
|
||||
|
||||
; *** BASIC ***
|
||||
|
||||
; RAM space used in different routines for short term processing.
|
||||
.equ SCRATCHPAD_SIZE STDIO_BUFSIZE
|
||||
.equ SCRATCHPAD STDIO_RAMEND
|
||||
.inc "lib/util.asm"
|
||||
.inc "lib/ari.asm"
|
||||
.inc "lib/parse.asm"
|
||||
.inc "lib/fmt.asm"
|
||||
.equ EXPR_PARSE parseLiteralOrVar
|
||||
.inc "lib/expr.asm"
|
||||
.inc "basic/util.asm"
|
||||
.inc "basic/parse.asm"
|
||||
.inc "basic/tok.asm"
|
||||
.equ VAR_RAMSTART SCRATCHPAD+SCRATCHPAD_SIZE
|
||||
.inc "basic/var.asm"
|
||||
.equ BUF_RAMSTART VAR_RAMEND
|
||||
.inc "basic/buf.asm"
|
||||
.equ BAS_RAMSTART BUF_RAMEND
|
||||
.inc "basic/main.asm"
|
||||
|
||||
init:
|
||||
di
|
||||
im 1
|
||||
|
||||
ld sp, RAMEND
|
||||
|
||||
; Initialize the keyboard latch by "dummy reading" once. This ensures
|
||||
; that the adapter knows it can fill its '164.
|
||||
; Port B TH output, high
|
||||
ld a, 0b11110111
|
||||
out (0x3f), a
|
||||
nop
|
||||
; Port A/B reset
|
||||
ld a, 0xff
|
||||
out (0x3f), a
|
||||
|
||||
call kbdInit
|
||||
call gridInit
|
||||
call vdpInit
|
||||
call basInit
|
||||
jp basStart
|
||||
|
||||
FNT_DATA:
|
||||
.bin "fnt/7x7.bin"
|
||||
|
||||
.fill 0x7ff0-$
|
||||
.db "TMR SEGA", 0x00, 0x00, 0xfb, 0x68, 0x00, 0x00, 0x00, 0x4c
|
||||
|
348
recipes/sms/kbd/ps2ctl.asm
Normal file
348
recipes/sms/kbd/ps2ctl.asm
Normal file
@ -0,0 +1,348 @@
|
||||
; Receives keystrokes from PS/2 keyboard and send them to the '164. On the PS/2
|
||||
; side, it works the same way as the controller in the rc2014/ps2 recipe.
|
||||
; However, in this case, what we have on the other side isn't a z80 bus, it's
|
||||
; the one of the two controller ports of the SMS through a DB9 connector.
|
||||
|
||||
; The PS/2 related code is copied from rc2014/ps2 without much change. The only
|
||||
; differences are that it pushes its data to a '164 instead of a '595 and that
|
||||
; it synchronizes with the SMS with a SR latch, so we don't need PCINT. We can
|
||||
; also afford to run at 1MHz instead of 8.
|
||||
|
||||
; *** Register Usage ***
|
||||
;
|
||||
; GPIOR0 flags:
|
||||
; 0 - when set, indicates that the DATA pin was high when we received a
|
||||
; bit through INT0. When we receive a bit, we set flag T to indicate
|
||||
; it.
|
||||
;
|
||||
; R16: tmp stuff
|
||||
; R17: recv buffer. Whenever we receive a bit, we push it in there.
|
||||
; R18: recv step:
|
||||
; - 0: idle
|
||||
; - 1: receiving data
|
||||
; - 2: awaiting parity bit
|
||||
; - 3: awaiting stop bit
|
||||
; R19: Register used for parity computations and tmp value in some other places
|
||||
; R20: data being sent to the '164
|
||||
; Y: pointer to the memory location where the next scan code from ps/2 will be
|
||||
; written.
|
||||
; Z: pointer to the next scan code to push to the 595
|
||||
;
|
||||
|
||||
.inc "avr.h"
|
||||
.inc "tn254585.h"
|
||||
.inc "tn45.h"
|
||||
|
||||
; *** Constants ***
|
||||
.equ CLK 2 ; Port B
|
||||
.equ DATA 1 ; Port B
|
||||
.equ CP 3 ; Port B
|
||||
; SR-Latch's Q pin
|
||||
.equ LQ 0 ; Port B
|
||||
; SR-Latch's R pin
|
||||
.equ LR 4 ; Port B
|
||||
|
||||
; init value for TCNT0 so that overflow occurs in 100us
|
||||
.equ TIMER_INITVAL 0x100-100
|
||||
|
||||
; *** Code ***
|
||||
|
||||
rjmp main
|
||||
rjmp hdlINT0
|
||||
|
||||
; Read DATA and set GPIOR0/0 if high. Then, set flag T.
|
||||
; no SREG fiddling because no SREG-modifying instruction
|
||||
hdlINT0:
|
||||
sbic PINB, DATA ; DATA clear? skip next
|
||||
sbi GPIOR0, 0
|
||||
set
|
||||
reti
|
||||
|
||||
main:
|
||||
ldi r16, RAMEND&0xff
|
||||
out SPL, r16
|
||||
ldi r16, RAMEND}8
|
||||
out SPH, r16
|
||||
|
||||
; init variables
|
||||
clr r18
|
||||
out GPIOR0, r18
|
||||
|
||||
; Setup int0
|
||||
; INT0, falling edge
|
||||
ldi r16, 0x02 ; ISC01
|
||||
out MCUCR, r16
|
||||
; Enable INT0
|
||||
ldi r16, 0x40 ; INT0
|
||||
out GIMSK, r16
|
||||
|
||||
; Setup buffer
|
||||
clr YH
|
||||
ldi YL, SRAM_START&0xff
|
||||
clr ZH
|
||||
ldi ZL, SRAM_START&0xff
|
||||
|
||||
; Setup timer. We use the timer to clear up "processbit" registers after
|
||||
; 100us without a clock. This allows us to start the next frame in a
|
||||
; fresh state. at 1MHZ, no prescaling is necessary. Each TCNT0 tick is
|
||||
; already 1us long.
|
||||
ldi r16, 0x01 ; CS00 - no prescaler
|
||||
out TCCR0B, r16
|
||||
|
||||
; init DDRB
|
||||
sbi DDRB, CP
|
||||
cbi PORTB, LR
|
||||
sbi DDRB, LR
|
||||
|
||||
sei
|
||||
|
||||
loop:
|
||||
brts processbit ; flag T set? we have a bit to process
|
||||
cp YL, ZL ; if YL == ZL, buffer is empty
|
||||
brne sendTo164 ; YL != ZL? our buffer has data
|
||||
|
||||
; nothing to do. Before looping, let's check if our communication timer
|
||||
; overflowed.
|
||||
in r16, TIFR
|
||||
sbrc r16, 1 ; TOV0
|
||||
rjmp processbitReset ; Timer0 overflow? reset processbit
|
||||
|
||||
; Nothing to do for real.
|
||||
rjmp loop
|
||||
|
||||
; Process the data bit received in INT0 handler.
|
||||
processbit:
|
||||
in r19, GPIOR0 ; backup GPIOR0 before we reset T
|
||||
andi r19, 0x1 ; only keep the first flag
|
||||
cbi GPIOR0, 0
|
||||
clt ; ready to receive another bit
|
||||
|
||||
; We've received a bit. reset timer
|
||||
rcall resetTimer
|
||||
|
||||
; Which step are we at?
|
||||
tst r18
|
||||
breq processbits0
|
||||
cpi r18, 1
|
||||
breq processbits1
|
||||
cpi r18, 2
|
||||
breq processbits2
|
||||
; step 3: stop bit
|
||||
clr r18 ; happens in all cases
|
||||
; DATA has to be set
|
||||
tst r19 ; Was DATA set?
|
||||
breq loop ; not set? error, don't push to buffer
|
||||
; push r17 to the buffer
|
||||
st Y+, r17
|
||||
rcall checkBoundsY
|
||||
rjmp loop
|
||||
|
||||
processbits0:
|
||||
; step 0 - start bit
|
||||
; DATA has to be cleared
|
||||
tst r19 ; Was DATA set?
|
||||
brne loop ; Set? error. no need to do anything. keep r18
|
||||
; as-is.
|
||||
; DATA is cleared. prepare r17 and r18 for step 1
|
||||
inc r18
|
||||
ldi r17, 0x80
|
||||
rjmp loop
|
||||
|
||||
processbits1:
|
||||
; step 1 - receive bit
|
||||
; We're about to rotate the carry flag into r17. Let's set it first
|
||||
; depending on whether DATA is set.
|
||||
clc
|
||||
sbrc r19, 0 ; skip if DATA cleared.
|
||||
sec
|
||||
; Carry flag is set
|
||||
ror r17
|
||||
; Good. now, are we finished rotating? If carry flag is set, it means
|
||||
; that we've rotated in 8 bits.
|
||||
brcc loop ; we haven't finished yet
|
||||
; We're finished, go to step 2
|
||||
inc r18
|
||||
rjmp loop
|
||||
processbits2:
|
||||
; step 2 - parity bit
|
||||
mov r1, r19
|
||||
mov r19, r17
|
||||
rcall checkParity ; --> r16
|
||||
cp r1, r16
|
||||
brne processbitError ; r1 != r16? wrong parity
|
||||
inc r18
|
||||
rjmp loop
|
||||
|
||||
processbitError:
|
||||
clr r18
|
||||
ldi r19, 0xfe
|
||||
rcall sendToPS2
|
||||
rjmp loop
|
||||
|
||||
processbitReset:
|
||||
clr r18
|
||||
rcall resetTimer
|
||||
rjmp loop
|
||||
|
||||
; Send the value of r20 to the '164
|
||||
sendTo164:
|
||||
sbis PINB, LQ ; LQ is set? we can send the next byte
|
||||
rjmp loop ; Even if we have something in the buffer, we
|
||||
; can't: the SMS hasn't read our previous
|
||||
; buffer yet.
|
||||
; We disable any interrupt handling during this routine. Whatever it
|
||||
; is, it has no meaning to us at this point in time and processing it
|
||||
; might mess things up.
|
||||
cli
|
||||
sbi DDRB, DATA
|
||||
|
||||
ld r20, Z+
|
||||
rcall checkBoundsZ
|
||||
ldi r16, 8
|
||||
|
||||
sendTo164Loop:
|
||||
cbi PORTB, DATA
|
||||
sbrc r20, 7 ; if leftmost bit isn't cleared, set DATA high
|
||||
sbi PORTB, DATA
|
||||
; toggle CP
|
||||
cbi PORTB, CP
|
||||
lsl r20
|
||||
sbi PORTB, CP
|
||||
dec r16
|
||||
brne sendTo164Loop ; not zero yet? loop
|
||||
|
||||
; release PS/2
|
||||
cbi DDRB, DATA
|
||||
sei
|
||||
|
||||
; Reset the latch to indicate that the next number is ready
|
||||
sbi PORTB, LR
|
||||
cbi PORTB, LR
|
||||
rjmp loop
|
||||
|
||||
resetTimer:
|
||||
ldi r16, TIMER_INITVAL
|
||||
out TCNT0, r16
|
||||
ldi r16, 0x02 ; TOV0
|
||||
out TIFR, r16
|
||||
ret
|
||||
|
||||
; Send the value of r19 to the PS/2 keyboard
|
||||
sendToPS2:
|
||||
cli
|
||||
|
||||
; First, indicate our request to send by holding both Clock low for
|
||||
; 100us, then pull Data low
|
||||
; lines low for 100us.
|
||||
cbi PORTB, CLK
|
||||
sbi DDRB, CLK
|
||||
rcall resetTimer
|
||||
|
||||
; Wait until the timer overflows
|
||||
in r16, TIFR
|
||||
sbrs r16, 1 ; TOV0
|
||||
rjmp $-4
|
||||
; Good, 100us passed.
|
||||
|
||||
; Pull Data low, that's our start bit.
|
||||
cbi PORTB, DATA
|
||||
sbi DDRB, DATA
|
||||
|
||||
; Now, let's release the clock. At the next raising edge, we'll be
|
||||
; expected to have set up our first bit (LSB). We set up when CLK is
|
||||
; low.
|
||||
cbi DDRB, CLK ; Should be starting high now.
|
||||
|
||||
; We will do the next loop 8 times
|
||||
ldi r16, 8
|
||||
; Let's remember initial r19 for parity
|
||||
mov r1, r19
|
||||
|
||||
sendToPS2Loop:
|
||||
; Wait for CLK to go low
|
||||
sbic PINB, CLK
|
||||
rjmp $-2
|
||||
|
||||
; set up DATA
|
||||
cbi PORTB, DATA
|
||||
sbrc r19, 0 ; skip if LSB is clear
|
||||
sbi PORTB, DATA
|
||||
lsr r19
|
||||
|
||||
; Wait for CLK to go high
|
||||
sbis PINB, CLK
|
||||
rjmp $-2
|
||||
|
||||
dec r16
|
||||
brne sendToPS2Loop ; not zero? loop
|
||||
|
||||
; Data was sent, CLK is high. Let's send parity
|
||||
mov r19, r1 ; recall saved value
|
||||
rcall checkParity ; --> r16
|
||||
|
||||
; Wait for CLK to go low
|
||||
sbic PINB, CLK
|
||||
rjmp $-2
|
||||
|
||||
; set parity bit
|
||||
cbi PORTB, DATA
|
||||
sbrc r16, 0 ; parity bit in r16
|
||||
sbi PORTB, DATA
|
||||
|
||||
; Wait for CLK to go high
|
||||
sbis PINB, CLK
|
||||
rjmp $-2
|
||||
|
||||
; Wait for CLK to go low
|
||||
sbic PINB, CLK
|
||||
rjmp $-2
|
||||
|
||||
; We can now release the DATA line
|
||||
cbi DDRB, DATA
|
||||
|
||||
; Wait for DATA to go low. That's our ACK
|
||||
sbic PINB, DATA
|
||||
rjmp $-2
|
||||
|
||||
; Wait for CLK to go low
|
||||
sbic PINB, CLK
|
||||
rjmp $-2
|
||||
|
||||
; We're finished! Enable INT0, reset timer, everything back to normal!
|
||||
rcall resetTimer
|
||||
clt ; also, make sure T isn't mistakely set.
|
||||
sei
|
||||
ret
|
||||
|
||||
; Check that Y is within bounds, reset to SRAM_START if not.
|
||||
checkBoundsY:
|
||||
tst YL
|
||||
breq $+4
|
||||
ret ; not zero, nothing to do
|
||||
; YL is zero. Reset Y
|
||||
clr YH
|
||||
ldi YL, SRAM_START&0xff
|
||||
ret
|
||||
|
||||
; Check that Z is within bounds, reset to SRAM_START if not.
|
||||
checkBoundsZ:
|
||||
tst ZL
|
||||
breq $+4
|
||||
ret ; not zero, nothing to do
|
||||
; ZL is zero. Reset Z
|
||||
clr ZH
|
||||
ldi ZL, SRAM_START&0xff
|
||||
ret
|
||||
|
||||
; Counts the number of 1s in r19 and set r16 to 1 if there's an even number of
|
||||
; 1s, 0 if they're odd.
|
||||
checkParity:
|
||||
ldi r16, 1
|
||||
lsr r19
|
||||
brcc $+4 ; Carry unset? skip next
|
||||
inc r16 ; Carry set? We had a 1
|
||||
tst r19 ; is r19 zero yet?
|
||||
brne checkParity+2 ; no? loop and skip first LDI
|
||||
andi r16, 0x1 ; Sets Z accordingly
|
||||
ret
|
||||
|
1
recipes/sms/romasm/.gitignore
vendored
Normal file
1
recipes/sms/romasm/.gitignore
vendored
Normal file
@ -0,0 +1 @@
|
||||
user.h
|
21
recipes/sms/romasm/Makefile
Normal file
21
recipes/sms/romasm/Makefile
Normal file
@ -0,0 +1,21 @@
|
||||
BASEDIR = ../../..
|
||||
ZASM = $(BASEDIR)/emul/zasm/zasm
|
||||
KERNEL = $(BASEDIR)/kernel
|
||||
APPS = $(BASEDIR)/apps
|
||||
|
||||
.PHONY: all clean
|
||||
all: os.sms
|
||||
|
||||
# -o value synced with offset in glue.asm
|
||||
ed.bin: $(APPS)/ed/glue.asm
|
||||
$(ZASM) -o 1f $(KERNEL) $(APPS) user.h < $(APPS)/ed/glue.asm > $@
|
||||
|
||||
# -o value synced with offset in glue.asm
|
||||
zasm.bin: $(APPS)/zasm/glue.asm
|
||||
$(ZASM) -o 24 $(KERNEL) $(APPS) user.h < $(APPS)/zasm/glue.asm > $@
|
||||
|
||||
os.sms: glue.asm ed.bin zasm.bin
|
||||
$(ZASM) $(KERNEL) $(APPS) ed.bin zasm.bin < glue.asm > $@
|
||||
|
||||
clean:
|
||||
rm -f os.sms ed.bin zasm.bin
|
61
recipes/sms/romasm/README.md
Normal file
61
recipes/sms/romasm/README.md
Normal file
@ -0,0 +1,61 @@
|
||||
# zasm and ed from ROM
|
||||
|
||||
SMS' RAM is much tighter than in the RC2014, which makes the idea of loading
|
||||
apps like zasm and ed in memory before using it a bit wasteful. In this recipe,
|
||||
we'll include zasm and ed code directly in the kernel and expose them as shell
|
||||
commands.
|
||||
|
||||
Moreover, we'll carve ourselves a little 1K memory map to put a filesystem in
|
||||
there. This will give us a nice little system that can edit small source files
|
||||
compile them and run them.
|
||||
|
||||
## Gathering parts
|
||||
|
||||
* A SMS that can run Collapse OS.
|
||||
* A [PS/2 keyboard adapter](../kbd/README.md)
|
||||
|
||||
## Build
|
||||
|
||||
There's nothing special with building this recipe. Like the base recipe, run
|
||||
`make` then copy `os.sms` to your destination medium.
|
||||
|
||||
If you look at the makefile, however, you'll see that we use a new trick here:
|
||||
we embed "apps" binaries directly in our ROM so that we don't have to load them
|
||||
in memory.
|
||||
|
||||
## Usage
|
||||
|
||||
Alright, here's what we'll do: we'll author a source file, assemble it and run
|
||||
it, *all* on your SMS! Commands:
|
||||
|
||||
Collapse OS
|
||||
> fnew 1 src
|
||||
> ed src
|
||||
: 1i
|
||||
.org 0xc200
|
||||
: 1a
|
||||
ld hl, sFoo
|
||||
: 2a
|
||||
call 0x3f
|
||||
: 3a
|
||||
xor a
|
||||
: 4a
|
||||
ret
|
||||
: 5a
|
||||
sFoo: .db "foo", 0
|
||||
: w
|
||||
> fnew 1 dest
|
||||
> fopn 0 src
|
||||
> fopn 1 dest
|
||||
> zasm 1 2
|
||||
First pass
|
||||
Second pass
|
||||
> dest
|
||||
foo>
|
||||
|
||||
Awesome right? Some precisions:
|
||||
|
||||
* Our glue code specifies a `USER_RAMSTART` of `0xc200`. This is where
|
||||
`dest` is loaded by the `pgm` shell hook.
|
||||
* `0x3f` is the offset of `printstr` in the jump table of our glue code.
|
||||
* `xor a` is for the command to report as successful to the shell.
|
187
recipes/sms/romasm/glue.asm
Normal file
187
recipes/sms/romasm/glue.asm
Normal file
@ -0,0 +1,187 @@
|
||||
; TODO: This recipe has not been tested since its conversion to the BASIC shell.
|
||||
; My PS/2 adapter has been acting up and probably has a loose wire. I need to
|
||||
; fix it beore I can test this recipe on real hardware.
|
||||
; But theoretically, it works...
|
||||
|
||||
; 8K of onboard RAM
|
||||
.equ RAMSTART 0xc000
|
||||
.equ USER_CODE 0xd500
|
||||
; Memory register at the end of RAM. Must not overwrite
|
||||
.equ RAMEND 0xddd0
|
||||
|
||||
jp init
|
||||
|
||||
; *** JUMP TABLE ***
|
||||
jp strncmp
|
||||
jp upcase
|
||||
jp findchar
|
||||
jp parseHex
|
||||
jp blkSel
|
||||
jp blkSet
|
||||
jp fsFindFN
|
||||
jp fsOpen
|
||||
jp fsGetB
|
||||
jp fsPutB
|
||||
jp fsSetSize
|
||||
jp printstr
|
||||
jp _blkGetB
|
||||
jp _blkPutB
|
||||
jp _blkSeek
|
||||
jp _blkTell
|
||||
jp printcrlf
|
||||
jp stdioPutC
|
||||
jp stdioReadLine
|
||||
|
||||
.fill 0x66-$
|
||||
retn
|
||||
|
||||
.inc "err.h"
|
||||
.inc "ascii.h"
|
||||
.inc "blkdev.h"
|
||||
.inc "fs.h"
|
||||
.inc "core.asm"
|
||||
.inc "str.asm"
|
||||
|
||||
.inc "sms/kbd.asm"
|
||||
.equ KBD_RAMSTART RAMSTART
|
||||
.equ KBD_FETCHKC smskbdFetchKCB
|
||||
.inc "kbd.asm"
|
||||
|
||||
.inc "sms/vdp.asm"
|
||||
.equ GRID_RAMSTART KBD_RAMEND
|
||||
.equ GRID_COLS VDP_COLS
|
||||
.equ GRID_ROWS VDP_ROWS
|
||||
.equ GRID_SETCELL vdpSetCell
|
||||
.equ GRID_GETC kbdGetC
|
||||
.inc "grid.asm"
|
||||
|
||||
.equ STDIO_RAMSTART GRID_RAMEND
|
||||
.equ STDIO_GETC gridGetC
|
||||
.equ STDIO_PUTC gridPutC
|
||||
.inc "stdio.asm"
|
||||
|
||||
.equ MMAP_START 0xd700
|
||||
; 0x180 is to leave some space for the stack
|
||||
.equ MMAP_LEN RAMEND-MMAP_START-0x180
|
||||
.inc "mmap.asm"
|
||||
|
||||
.equ BLOCKDEV_RAMSTART STDIO_RAMEND
|
||||
.equ BLOCKDEV_COUNT 3
|
||||
.inc "blockdev.asm"
|
||||
; List of devices
|
||||
.dw mmapGetB, mmapPutB
|
||||
.dw f0GetB, f0PutB
|
||||
.dw f1GetB, f1PutB
|
||||
|
||||
|
||||
.equ FS_RAMSTART BLOCKDEV_RAMEND
|
||||
.equ FS_HANDLE_COUNT 2
|
||||
.inc "fs.asm"
|
||||
|
||||
; *** BASIC ***
|
||||
|
||||
; RAM space used in different routines for short term processing.
|
||||
.equ SCRATCHPAD_SIZE STDIO_BUFSIZE
|
||||
.equ SCRATCHPAD FS_RAMEND
|
||||
.inc "lib/util.asm"
|
||||
.inc "lib/ari.asm"
|
||||
.inc "lib/parse.asm"
|
||||
.inc "lib/fmt.asm"
|
||||
.equ EXPR_PARSE parseLiteralOrVar
|
||||
.inc "lib/expr.asm"
|
||||
.inc "basic/util.asm"
|
||||
.inc "basic/parse.asm"
|
||||
.inc "basic/tok.asm"
|
||||
.equ VAR_RAMSTART SCRATCHPAD+SCRATCHPAD_SIZE
|
||||
.inc "basic/var.asm"
|
||||
.equ BUF_RAMSTART VAR_RAMEND
|
||||
.inc "basic/buf.asm"
|
||||
.equ BFS_RAMSTART BUF_RAMEND
|
||||
.inc "basic/fs.asm"
|
||||
.inc "basic/blk.asm"
|
||||
.equ BAS_RAMSTART BFS_RAMEND
|
||||
.inc "basic/main.asm"
|
||||
|
||||
; USER_CODE is set according to this output below.
|
||||
.out BAS_RAMEND
|
||||
|
||||
init:
|
||||
di
|
||||
im 1
|
||||
|
||||
ld sp, RAMEND
|
||||
|
||||
; init a FS in mmap
|
||||
ld hl, MMAP_START
|
||||
ld a, 'C'
|
||||
ld (hl), a
|
||||
inc hl
|
||||
ld a, 'F'
|
||||
ld (hl), a
|
||||
inc hl
|
||||
ld a, 'S'
|
||||
ld (hl), a
|
||||
|
||||
call fsInit
|
||||
xor a
|
||||
ld de, BLOCKDEV_SEL
|
||||
call blkSel
|
||||
call fsOn
|
||||
|
||||
call kbdInit
|
||||
call gridInit
|
||||
call vdpInit
|
||||
|
||||
call basInit
|
||||
ld hl, basFindCmdExtra
|
||||
ld (BAS_FINDHOOK), hl
|
||||
jp basStart
|
||||
|
||||
basFindCmdExtra:
|
||||
ld hl, basFSCmds
|
||||
call basFindCmd
|
||||
ret z
|
||||
ld hl, basBLKCmds
|
||||
call basFindCmd
|
||||
ret z
|
||||
ld hl, .mycmds
|
||||
call basFindCmd
|
||||
ret z
|
||||
jp basPgmHook
|
||||
.mycmds:
|
||||
.db "ed", 0
|
||||
.dw 0x1f00
|
||||
.db "zasm", 0
|
||||
.dw 0x2400
|
||||
.db 0xff
|
||||
|
||||
f0GetB:
|
||||
ld ix, FS_HANDLES
|
||||
jp fsGetB
|
||||
|
||||
f0PutB:
|
||||
ld ix, FS_HANDLES
|
||||
jp fsPutB
|
||||
|
||||
f1GetB:
|
||||
ld ix, FS_HANDLES+FS_HANDLE_SIZE
|
||||
jp fsGetB
|
||||
|
||||
f1PutB:
|
||||
ld ix, FS_HANDLES+FS_HANDLE_SIZE
|
||||
jp fsPutB
|
||||
|
||||
; last time I checked, PC at this point was 0x128f. Let's give us a nice margin
|
||||
; for the start of ed.
|
||||
.fill 0x1f00-$
|
||||
.bin "ed.bin"
|
||||
|
||||
; Last check: 0x23b0
|
||||
.fill 0x2400-$
|
||||
.bin "zasm.bin"
|
||||
|
||||
FNT_DATA:
|
||||
.bin "fnt/7x7.bin"
|
||||
|
||||
.fill 0x7ff0-$
|
||||
.db "TMR SEGA", 0x00, 0x00, 0xfb, 0x68, 0x00, 0x00, 0x00, 0x4c
|
32
recipes/sms/romasm/user.h
Normal file
32
recipes/sms/romasm/user.h
Normal file
@ -0,0 +1,32 @@
|
||||
.equ USER_CODE 0xc200
|
||||
; Make ed fit in SMS's memory
|
||||
.equ ED_BUF_MAXLINES 0x100
|
||||
.equ ED_BUF_PADMAXLEN 0x800
|
||||
|
||||
; Make zasm fit in SMS's memory
|
||||
.equ ZASM_REG_MAXCNT 0x80
|
||||
.equ ZASM_LREG_MAXCNT 0x10
|
||||
.equ ZASM_REG_BUFSZ 0x800
|
||||
.equ ZASM_LREG_BUFSZ 0x100
|
||||
|
||||
; *** JUMP TABLE ***
|
||||
.equ strncmp 0x03
|
||||
.equ upcase @+3
|
||||
.equ findchar @+3
|
||||
.equ parseHex @+3
|
||||
.equ blkSel @+3
|
||||
.equ blkSet @+3
|
||||
.equ fsFindFN @+3
|
||||
.equ fsOpen @+3
|
||||
.equ fsGetB @+3
|
||||
.equ fsPutB @+3
|
||||
.equ fsSetSize @+3
|
||||
.equ printstr @+3
|
||||
.equ _blkGetB @+3
|
||||
.equ _blkPutB @+3
|
||||
.equ _blkSeek @+3
|
||||
.equ _blkTell @+3
|
||||
.equ printcrlf @+3
|
||||
.equ stdioPutC @+3
|
||||
.equ stdioReadLine @+3
|
||||
|
@ -44,7 +44,7 @@ int main(int argc, char **argv)
|
||||
set_blocking(fd, 1);
|
||||
char s[0x40];
|
||||
sprintf(s,
|
||||
": _ 0x%04x 0x%04x DO KEY DUP .x I C! LOOP ; _",
|
||||
": _ 0x%04x 0x%04x DO KEY DUP .x I A! LOOP ; _",
|
||||
memptr+bytecount, memptr);
|
||||
sendcmd(fd, s);
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user