Commit Graph

112 Commits

Author SHA1 Message Date
Virgil Dupras
63d2c97386 z80 asm: document the 0x8000 limitation better
When I get bitten by it myself, it's because it's clearly
underdocumented!
2020-12-14 14:40:22 -05:00
Virgil Dupras
35dca04ec9 doc/sms/at28: add note about CE-inhibit jumper 2020-12-12 10:47:30 -05:00
Virgil Dupras
94f5b9d141 doc: add notes about cross-compiling directly to EEPROM
I've tested that it works in emulation. The only test left is the
real deal my a Sega Master System.
2020-12-11 21:52:46 -05:00
Virgil Dupras
374a0a8e46 doc: update AT28 instructions for new ~AT28 routine 2020-12-09 20:44:04 -05:00
Virgil Dupras
cbd9f035ae Add ~C!ERR
A ~C! override can, if it wants, go put an error code in there,
which ~AT28 does.

This way, after a copy or xcomp process directly to EEPROM, one
can verify whether all bytes were successfully written by checking
whether "~C!ERR C@" is zero.
2020-12-09 19:52:58 -05:00
Virgil Dupras
594b3c3348 Add ~C! to override memory low level write routines
Also, turn AT28! and AT28, into ~AT28, pluggable into ~C!.

~AT28 doesn't check for mismatches. It was too complicated to turn
a mismatch into a compiled word we would jump to next. Data
integrity has to be checked through another path.

Also, remove MOVEW. Without indirect memory access, this word
doesn't make sense. Some AVR-specific words will have to be
defined.
2020-12-08 21:55:39 -05:00
Virgil Dupras
74f46c1288 z80a: add ELSE, 2020-12-07 23:06:12 -05:00
Virgil Dupras
45eceaaf61 Remove indirect memory access
I got bitten again, I've over-designed my solution. The last time
it happened, it was that memory mapping thing I was wanting to add.

The indirect memory access feature I was adding was to solve a
specific problem: Allow Collapse OS to cross-compile directly on a
AT28 EEPROM.

It began well. As long as we were staying in the assembler realm,
things were looking good. However, when we got into the xcomp realm
(B260), things became ugly, and I had to creep up indirection where
I didn't want to.

All of this because I wanted to solve my initial problem in a
slightly more generalized way. The broad idea was that these indirect
memory access could allow xcomp into a broad kind of memory-like
devices.

This idea broke on the "@" part of the equation. If I want
indirections to be two-way and allow xcomp to work properly, I have
to add this indirection to FIND (and possibly others) and this just
isn't practical or elegant.

So, I'm taking a step back and accepting that the solution I design
for now is exclusively for the AT28. What I'm thinking is to add a
low-level hook for memory writing, at the assembly level.
2020-12-07 22:34:53 -05:00
Virgil Dupras
80d1b59050 Add words |M and |L
Splitting a word into MSB/LSB pairs happens often and is worth, I
think, native words. Also, I'm going to need it in the upcoming
commits.
2020-12-07 20:11:49 -05:00
Virgil Dupras
e5a983ab7f Rename A!, A@ and A, to C!*, C@* and C,*
Also, rename "Addressed devices" to "Indirect memory access".

I do this because I need to add indirect versions of !, @ and ,
to allow boostrapping directly to EEPROM and that A,, thing I've
added to assemblers felt like really bad names.

With this change, I'd like to generalize the use of the * suffix
for aliases.
2020-12-07 19:06:58 -05:00
Virgil Dupras
bb8d66a425 doc/hw/z80/sms: add Dual EEPROM cartridge design 2020-12-06 15:44:45 -05:00
Virgil Dupras
b12ac4b672 doc: fix PS/2 recipe
During the recipe overhaul, I forgot to carry PS/2 schematics over.
Also, the recipe should go in hw/z80 because it's specific to Z80.
2020-12-05 19:48:38 -05:00
Virgil Dupras
e8cc3040d1 Improve impl's word execution documentation
Add an example, which I think helps a lot to grasp the idea.

Also, improve comments in Z80 boot code.
2020-11-28 13:15:16 -05:00
Virgil Dupras
db1d6424b3 Rename (print) to STYPE
This brings us a bit closer to TYPE from Forth 2012. I don't think
I'll add TYPE (sig "addr len") anytime soon because there is few
use cases for it, but having "STYPE" instead of "(print)" feels
cleaner.
2020-11-28 11:28:28 -05:00
Virgil Dupras
b48455e4db Improve initialization sequence documentation 2020-11-28 11:17:50 -05:00
Virgil Dupras
f8b7a3ce65 Rename switch to ialias
The switch name was confusing.
2020-11-28 10:58:16 -05:00
Virgil Dupras
b4f3fde062 sms: generate TMR SEGA signature in Collapse OS itself
Having the signature generation code in /tools prevents self-hosting
on the SMS.
2020-11-25 21:42:07 -05:00
Virgil Dupras
cf79ceefea sms: add cursor visual indicator in VDP mode 4
This required the change of CURSOR! signature: we now supply it
with both old and new cursor positions.

Also, fix broken _bs in Grid subsystem.
2020-11-16 10:05:48 -05:00
Virgil Dupras
b1e162b8a3 grid: change the meaning of CELL!
Replace the "g" arg (glyph) with "c" (character). The reason why "g"
was used was to save a "0x20 -" operation at all CELL! implementations,
but this came with too big a drawback: it made CELL! hardly usable
outside of the Grid subsystem, mostly because the user of CELL! would
often have to do "0x20 -".

For example, I want the SMS's Pad driver to use CELL! directly instead
of having to do EMIT+XYPOS-messing-around. I would have had to do a
"0x20 -" there.
2020-11-16 09:11:47 -05:00
Virgil Dupras
7bfec5d9e9 grid: Add CURSOR! to the grid protocol
With the move of CVM's forth to the grid protocol, we've lost the
cursor's visual indication. Now, we have it back.

The challenge now is in implementing it in SMS' text mode. In mode
4, it's easy to mark a cell as inverted, but in text mode, that's
not possible.
2020-11-16 08:41:09 -05:00
Virgil Dupras
d3049b2404 grid: add XYMODE
In VE on the SMS, the first contents line would always be cleared
because of NEWLN being called when the FBUF would spit its last
char. Inconvenient...

I've added a "graphical" mode to the grid subsystem to inhibit this
behavior in a graphical situation such as in VE.

Also, write a more complete Grid documentation.
2020-11-14 22:35:08 -05:00
Virgil Dupras
7722db0762 Fix mis-documentation in 8086 boot code comments 2020-11-14 20:28:44 -05:00
Virgil Dupras
4720714bd4 doc: improve "hook word" description 2020-11-14 14:34:01 -05:00
Virgil Dupras
3f38c025e7 VE: add support for tight screens 2020-11-13 20:44:39 -05:00
Virgil Dupras
c7d8de25b2 ti84: use Grid subsystem
Also, rename CLRLN to NEWLN and make it clear that it's only called
on entering a new line. This way, we can set Z offset in there for
the TI-84+ LCD driver.
2020-11-10 20:30:37 -05:00
Virgil Dupras
2d54c3243d grid: add CLRLN and change _lf behavior
Instead of clearing the rest of the line on a _lf, it's simpler
to just clear any new line we're entering into.
2020-11-10 19:35:47 -05:00
Virgil Dupras
e0bcf3473e Adjust Grid subsystem
Rename ROWS to LINES (it's what VE uses). Also, don't use COLS and
LINES as immediates in the Grid subsystem: we expect those words to
be available at runtime.
2020-11-10 19:06:39 -05:00
Virgil Dupras
b97e761942 Add Grid subsystem
The goal is to offload the SMS VDP driver a little bit.
2020-11-09 17:26:15 -05:00
Virgil Dupras
3615944ffa Remove MIN and MAX from core
It isn't used in there anymore. Moved it to VE, the only place
where it's used.
2020-11-08 17:22:54 -05:00
Virgil Dupras
11ebaaaa0b doc: add SPI relay instructions for the SMS 2020-11-08 11:35:06 -05:00
Virgil Dupras
0a26acfee6 ps2: interpret KC 0x1f as '2'
The '2' key on my PS/2 keyoard never worked on Collapse OS, I
wasn't sure why. I thought the keyboard was broken, but then I
tried another one, still broken. But it's only the '2'!

The KC sent is 0x1f. Is it a timing problem with the ATtiny? I
have yet to wire my prototype for logic probing. Meanwhile, let's
apply a band-aid.
2020-11-06 17:21:13 -05:00
Virgil Dupras
29f3bf1e70 doc/hw/sms: adjust ROM hacking instructions
Previous instructions would only work with an AT28C64. Now, it also
work with an AT28C256.
2020-11-03 16:54:30 -05:00
Virgil Dupras
3a0084aa31 doc/bootstrap: fix inaccuracies 2020-10-31 15:30:07 -04:00
Virgil Dupras
7001446212 Complete overhaul of recipes
Recipes contain bits and pieces of hardware-related knowledge, but
these bits feel sparse. I've been wanting to consolidate hardware-
related documentation for a while, but always fell at odds with the
recipes organisation.

We don't have recipes anymore, just a /doc/hw section that contains
hardware-related documentation which often translate to precise
instructions to run Collapse OS on a specific machine.

With this new organisation, I hope to end up with a better, more
solid documentation.
2020-10-30 20:39:39 -04:00
Virgil Dupras
e31527f5ac Add word ROT>
There are many situations where it can be useful. Worth it.
2020-10-29 12:41:08 -04:00
Virgil Dupras
75ef1f440c Make MOVE* words use A@ and A!
This allows us to remove AMOVE* words.
2020-10-29 12:15:21 -04:00
Virgil Dupras
de7cb4a80f Add word A,
This would be useful, for example, to allow the assembler to write
straight to an AT28 EEPROM without going to RAM. This would be a
life saver in machines with tight RAM such as the SMS.
2020-10-28 20:45:50 -04:00
Virgil Dupras
adea75e50a Add alias and switch word types
I'm pretty happy about how lightweight the implementation turns
out to be.
2020-10-28 15:02:06 -04:00
Virgil Dupras
04bd57b527 Remove BIT@ and BIT!
They were only used in the ti84 recipe and were not worth their cost.
2020-10-27 22:51:08 -04:00
Virgil Dupras
fc63541725 Improve documentation 2020-10-27 19:53:02 -04:00
Virgil Dupras
eafcb0c440 avrpgm: add EEPROM support
also, verify all 3 first bytes of SPI commands. I'm not sure why
I wasn't doing that, probably because I was getting a lot of AVR
err and thought that only 2 bytes of the cmd were echoed. But now,
with a reliable SPI setup, verifying 3 bytes seems to work.
2020-10-05 19:36:49 -04:00
Virgil Dupras
dafcf72d5b Add ATmega328P definitions 2020-10-05 16:56:09 -04:00
Virgil Dupras
ebafa79795 Improve AVR docs
After many trials and errors in reliably accessing AVR chips through
my SPI relay design, I resigned myself to accepting 125kHz communication
speed with it. I find the complexity of solutions allowing to keep 250kHz
speeds to be excessive.
2020-10-05 16:46:16 -04:00
Virgil Dupras
44bcdd4327 Document 8086 asm instructions list
Also, remove needless argtype in CALL and RET
2020-09-25 19:44:32 -04:00
Virgil Dupras
8bf6258673 Add word TICKS
Adding a delay such as the 20ms one we have in AVR programmer's
initialization routine is tricky without a word like TICKS.

This implementation is highly inaccurate, but more accurate and
reliable than a "ballpark" DO..LOOP...
2020-09-25 17:31:06 -04:00
Virgil Dupras
35840ad8e6 sdc: don't use ABORT"
ABORT" doesn't work in xcomp.

Also, improve xcomp docs and fix misdocumentation.
2020-09-24 13:10:41 -04:00
Virgil Dupras
25a35cf28e Move 8086 boot code from B800 to B440
That slims down blkfs a lot.
2020-09-21 20:09:42 -04:00
Virgil Dupras
037c10fc57 Move AVR programmer from B690 to B160
Also, remove leftovers from previous move.
2020-09-21 20:00:49 -04:00
Virgil Dupras
faf088b397 Move AVR assembler from B650 to B50
And move its doc to doc/asm.txt
2020-09-21 19:52:53 -04:00
Virgil Dupras
b21be43535 Move 8086 assembler from B730 to B30
Also, move doc to doc/asm.txt.

Also, fix the pcat recipe which was broken since the overlay change.
I hadn't noticed it because I didn't have to rebuild the MBR.
2020-09-21 19:24:54 -04:00