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Author SHA1 Message Date
link2xt
d83d12899b
MOVE: do not crash when u is 0 (#126) 
This commit adds ?DUP IF guards to MOVE and MOVE- that make them exit
when u is 0. Without these guards a DO loop was executed 65535 times
instead of 0.

In particular, this fixes a crash when "105 LOAD I " is executed
immediately after boot. Block editor word "I" passes IBUF length (0)
to MOVE- and MOVE in this case, causing a crash.
 2020-06-21 05:49:45 -05:00
Virgil Dupras
99c05fff3c pcat: it works! 
Forth intepreter now works! There's still DOES> and overflow checks
to implement, but otherwise, we have it!
 2020-06-20 20:06:42 -04:00
Virgil Dupras
ae719508d9 pcat: make /MOD division 16-bit 
Was required for the many "256 /MOD" in the code.
 2020-06-20 19:14:51 -04:00
Virgil Dupras
60ecab314e pcat: we have PROMPT! 
Not working, but we do get that sweet "CollapseOS".
 2020-06-20 16:58:48 -04:00
Virgil Dupras
397ee3e3e6 Simplify word ' 2020-06-20 14:13:41 -04:00
Virgil Dupras
1536434666 pcat: implement cell execution and shaping things up 2020-06-20 13:50:01 -04:00
Virgil Dupras
c571567660 emul: make verbose staging the default 
I always keep it on myself. I can imagine it's especially useful to
newcomers.
 2020-06-20 13:41:39 -04:00
Virgil Dupras
acf8e03f53 8086asm: add overflow check to RPCs, 
I've spent way too much time debugging bugs caused by this...

*sigh*, why can't I learn?
 2020-06-20 13:36:21 -04:00
Virgil Dupras
019fd8a67d pcat: fix ?DUP 2020-06-20 07:34:46 -04:00
Virgil Dupras
9d2afd200c pcat: implement (s) 2020-06-19 20:09:51 -04:00
Virgil Dupras
723d3c4249 pcat: all native words implemented! 
(well, not PC@ and PC!, but I'm not even sure what would be the role
of these in a PC/AT. they're only used in drivers on the z80 front,
so they will not be immediately needed. todo... )

Now comes the fitting part.
 2020-06-19 08:10:51 -04:00
Virgil Dupras
8cc8df0446 pcat: add native _find 2020-06-19 07:56:54 -04:00
Virgil Dupras
5ebdf84e78 pcat: more native words 
almost there!
 2020-06-19 07:26:33 -04:00
Virgil Dupras
89bc7df120 pcat: more native words 2020-06-18 23:10:14 -04:00
Virgil Dupras
3b21ba635d pcat: add PICK and (roll) 2020-06-18 21:21:46 -04:00
Virgil Dupras
6b07296d30 pcat: more native words 2020-06-18 19:06:53 -04:00
Virgil Dupras
bd508daad9 pcat: begin organizing native words properly 
This port is taking shape!
 2020-06-18 15:28:30 -04:00
Virgil Dupras
6bc1738bfd pcat: implement (loop) 
8086 asm is a lot terser than z80... Those indirect memory operations
are very handy.
 2020-06-18 15:01:04 -04:00
Virgil Dupras
aca9bc9058 z80: small optimization in cell execution 2020-06-18 08:02:45 -04:00
Virgil Dupras
035532acf7 z80: remove remaining indirections in execute calls 
We now have a stable ABI that is pretty cleared up...
 2020-06-18 07:50:20 -04:00
Virgil Dupras
42818d25be z80: remove layers of indirection of find calls 2020-06-18 07:40:20 -04:00
Virgil Dupras
76e698157c z80: remove layer of indirection in most "next" calls 
The only calls still using the stable ABI indirection are those
made before the next routine is created.
 2020-06-18 07:24:47 -04:00
Virgil Dupras
eba83fa9a9 z80: use named labels for boot routines 
The usage of numerotated labels for this was becoming severly
confusing.
 2020-06-18 07:16:40 -04:00
Virgil Dupras
eed817b517 pcat: adapt to word type change 2020-06-18 06:50:32 -04:00
Virgil Dupras
3d2dc041fb Make word routines into word types 
Instead of having wordref point to core word routines, I made them
into word 4 word types. It liberates space into the stable ABI and
should make porting to other arches easier.

I'm also thinking of combining word type with the namelen field
for precious bytes saving, but not now...
 2020-06-17 21:41:01 -04:00
Virgil Dupras
3383a00040 Fix recipes with binary offset (ti84, trs80) 
I broke them when I removed call indirection layers without also
removing usage of BCALL.
 2020-06-17 17:44:33 -04:00
Virgil Dupras
1d468d2168 Fix mis-documentation about literal words 2020-06-17 16:31:08 -04:00
Virgil Dupras
2be2f74a43 Make literal word routines into regular native words 2020-06-17 14:25:32 -04:00
Virgil Dupras
ea9833d4ff Remove LITA 
It was useful when we still had the relinker, but now it has no use.
I was waiting a bit to see if the distinction would be useful again,
but it seems like it won't.
 2020-06-17 13:50:42 -04:00
Virgil Dupras
abb4dc8bd7 Reduce the scope of the stable ABI 
Only 2>R in actually needed in the RSP family (for LOOP). Reducing
the scope of the stable ABI makes porting to other arches easier.
 2020-06-17 07:54:43 -04:00
Virgil Dupras
bc8144b4be pcat: implement (br) and (br?) 2020-06-16 22:10:32 -04:00
Virgil Dupras
49979404a5 pcat: implement number literals 2020-06-16 21:34:35 -04:00
Virgil Dupras
a92864a595 pcat: implement RSP mechanism in execution model 2020-06-16 20:41:53 -04:00
link2xt
4017fd04ac
Replace deprecated bzero with memset (#119) 2020-06-16 18:58:23 -05:00
link2xt
79da1db90e
tools: mark local C functions as static (#120) 2020-06-16 18:58:00 -05:00
link2xt
472331b450
Check spelling (#121) 2020-06-16 18:57:31 -05:00
link2xt
6a09910dfc
BROWSE: ignore invalid digits (#123) 
Documentation in block 100 says a number followed by a space or return
lists the contents of the block. However, typing any other character
does this too, because _pdacc returns -1 in this case.

This is annoying because typing "n" instead of "N" immediately after
jumping to some block was bringing you to block 0. Now "n" is ignored
instead.

This commit changes the condition for printing to explicitly check for
the value of 1, which means whitespace according to _pdacc documentation
in block 355.
 2020-06-16 18:55:26 -05:00
link2xt
f1a225ef3d
Fix unreadable sentence in block 031. (#122) 
This clearly has some words missing.
 2020-06-16 18:28:06 -05:00
Virgil Dupras
16d6a0b377 pcat: begin implementing compiledWord/next 2020-06-16 19:05:36 -04:00
Virgil Dupras
feeedcc55c z80: small optimization in execute 
I had more ambitious goals, but I backed out of it: not worth it.
This small optimization is an easy picking though.
 2020-06-16 16:37:21 -04:00
Virgil Dupras
dabbd6c253 8086asm: add support for modrm 8-bit displacement 2020-06-15 06:52:47 -04:00
Virgil Dupras
d8d2e05eb2 pcat: make find compare strings 
find is the biggest chunk of logic of the boot code. The 8086 version
is significantly terser than the z80 one. REP/CMPS helps...
 2020-06-15 06:23:19 -04:00
Virgil Dupras
8c452f5add pcat: begin implementing find 
Not comparing strings yet. Without asm tooling support, it's a big
chunk to swallow at once. It's progressing well!
 2020-06-14 21:52:58 -04:00
Virgil Dupras
3be30e24bb pcat: implement execute and nativeWord 2020-06-14 15:27:26 -04:00
Virgil Dupras
bf0e999f8e pcat: read LATEST and jump to it 2020-06-14 14:51:32 -04:00
Virgil Dupras
a72322df31 pcat: begin structuring around words 2020-06-14 14:15:44 -04:00
Virgil Dupras
85a0b87da3 z80: reorder compiledWord and doesWord, saving ourselves a jump 2020-06-14 10:12:56 -04:00
Virgil Dupras
38d5a9f303 z80: inline cellWord in stable ABI 2020-06-14 10:07:46 -04:00
Virgil Dupras
40f92b9bab z80: optimize chkPS 
Inline it in next and make chkPS, call a newly reserved label for
it directly, removing a layer of indirection. This frees a spot in
the stable ABI.
 2020-06-14 09:48:10 -04:00
Virgil Dupras
31095bc04d z80: remove call indirections in tight spots 2020-06-14 09:29:34 -04:00