Commit Graph

1656 Commits

Author SHA1 Message Date
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 dda80801d5 Remove WORD( and PREV
They're only used once.
2020-12-09 17:46:22 -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 953e040231 emul/z80: add AT28 EEPROM emulator
This will facilitate the development of a solution for
cross-compiling directly to EEPROM.
2020-12-08 20:07:53 -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 55a7726f70 Have FILL use indirect memory access
This allows SMS xcomp to use ALLOT0 instead of ZFILL,
2020-12-07 19:17:51 -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 c5bf0ade1b Use A! instead of C! in THEN, in z80 and 8086 assemblers 2020-12-07 12:32:32 -05:00
Virgil Dupras 06b71a6906 Add AT28, as a companion to AT28!
This word, suitable to plug to A, , increases HERE before doing its
verification to minimize waiting time: While we increase HERE, the
AT28 has the time to do its programming, and thus we'll need to idle
for less time afterwards.

Also, made the mismatch check silently ignore MSB. Previously, writing
a value larger than 0xff with AT28! would always result in a mismatch.
2020-12-07 12:28:48 -05:00
Virgil Dupras 1e8f957910 emul/trs80: implement floppy emulation
So far, only the first 400 sectors of the disk image are accessible.

TODO: add keybindings to swap floppies on the emulated machine.
2020-12-06 19:52:18 -05:00
Virgil Dupras bb8d66a425 doc/hw/z80/sms: add Dual EEPROM cartridge design 2020-12-06 15:44:45 -05:00
Virgil Dupras 23885dac33 emul: add TRS-80 emulator
Not complete yet, but has @KEY and @DSP, enough to get prompt.
2020-12-05 22:04:22 -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 038ca61ea5 Fix broken tools makefile 2020-11-28 11:31:27 -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 631e7f1008 tools/exec: fix segfault 2020-11-17 17:02:10 -05:00
Virgil Dupras 959382c079 sms: implement (spix) in z80 asm
Doing SPI bit-banging through a controller port is already really
slow, but doing so with the Forth version of (spix) was really,
really slow.

With this pure z80 version of (spix), it's more bearable.
2020-11-17 17:01:49 -05:00
Virgil Dupras 4d26f1c490 VE: try to use CELL! more
At-XY+EMIT is slow compared to direct CELL! usage. It is seen very
clearly on a SMS when VE is doing its initial clrscr (yes, I could
manage to load VE from a SD card and run it on a real SMS!).

The grid protocol wasn't there when I wrote VE initially. I only had
AT-XY. Now that we have a solid protocol to build on, let's do it.
2020-11-17 12:07:22 -05:00
Virgil Dupras 224e9183fb cvm: fix NEWLN behavior
I hadn't noticed yet, but making CVM use the Grid subsystem made
me lose scrolling. It's fine because that scrolling was "artificial"
in the sense that it was provided by curses, not Collapse OS and I
prefer having something that closer emulates a real machine.

However, CVM didn't properly clear the new line when entering it.
Fixed.

Scrolling behavior will come back when it's implemented in the Grid
subsystem.
2020-11-17 11:52:54 -05:00
Virgil Dupras eab8ab6f60 Fix "," char in 5x7 font 2020-11-17 11:24:51 -05:00
Virgil Dupras 30da1bd75b grid: fix PSP leak on newline 2020-11-17 11:19:37 -05:00
Virgil Dupras 57fd14b0b3 sms: fix cursor mis-display in text mode
In CURSOR!, I was using a write commande to read from VRAM and the
emulator didn't properly behave and did as if everything was fine.

The result on a real SMS was that the cursor would contain the
inverted glyph of the contents of the *old* cursor position.
2020-11-16 13:10:04 -05:00
Virgil Dupras c8be290b88 sms: add cursor indicator to text mode
I do this by adding an inverted version of all glyphs in the upper
range of the pattern memory. This is a big waste of the pattern
space (only one inverted character is needed at once), but it's the
simplest way to proceed. I'll change this if I ever need more
pattern space.

Also, remove _blank. It was wastefully blanking the whole memory.
Only the name table needs to be blanked on initialization.
2020-11-16 11:13:38 -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 74d2a5d722 sms: use CELL! directly in Pad driver 2020-11-16 09:19:55 -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 c939c7e84a cvm: use Grid in /cvm/forth
Also, fixed broken AT-XY in Grid...
2020-11-14 20:08:18 -05:00
Virgil Dupras 95ab1ad588 Transform "blk/" folders into "blk.fs" text files
Working in "blk/" folder from a modern system is harder than it
should be. Moving blocks around is a bit awkward, grepping is a
bit less convenient than it could be, git blame has troubles
following, etc.

In this commit, we modify blkpack and blkunpack to work with single
text files with blocks being separated by a special markup.

I think this will make the code significantly more convenient to
work into.
2020-11-14 18:34:15 -05:00
Virgil Dupras 532bcc7e78 cvm: split stage and forth xcomp units
I wanted to make CVM's forth use the Grid subsystem, but doing so
would break the stage binary. Hence, this split.
2020-11-14 15:00:03 -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 6a7c8ae1c8 VE: allow usage on screens narrower than 67 columns
Previously, display would be completely broken. We have yet to add
a way to display the "right" part of a buffer on such smaller
displays.
2020-11-13 15:52:12 -05:00
Virgil Dupras 10da104873 VE: decouple from core's LIST
I'm planning on de-hardcoding columns in VE a bit to add support
for screens narrower than 67 columns. There's a lot of hardcoding.

Let's begin with not using core's LIST anymore. This allows us to
spit 1-16 numbers only at startup.
2020-11-13 15:19:00 -05:00
Virgil Dupras d1718a90c7 sms: add support for VDP's text mode
Because that mode behaves exactly like in a regular TMS9918, a new
driver for TMS9918 has been added in blkfs and SMS' VDP now uses it.

Also, fix broken 5x7 font.
2020-11-13 12:18:00 -05:00
Virgil Dupras 09c01c4a43 emul/z80: extract tms9918 unit from sms_vdp
I'm planning on supporting Text Mode soon, and SMS' VDP, when mode
4 is not active, behaves mostly like a regular TMS9918.

By having this behavior in a separate unit, we'll be able to use it
in other systems.
2020-11-12 11:13:18 -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 603ad5d255 sms: don't use MIN in drivers
it has been removed from the core.
2020-11-09 15:03:41 -05:00
Virgil Dupras be52fb1383 sms/vdp: fix bad mirroring
On the real machine, I ended up at some point getting a weird "bottom
mirroring" issue. It turns out that it was because when I revamped my
VDP flags in an earlier commit, I hadn't read the whole technical
notes about register $02 and falsely thought that B0 was ignored. No
it's not. When set, it mirrors the bottom 8 rows.
2020-11-09 14:56:25 -05:00