Commit Graph

22 Commits

Author SHA1 Message Date
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
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
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
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
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
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
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
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
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
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
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
Virgil Dupras
f09950a12a sms/vdp: clear rest of line on line feed
This allows us (in the following commit), to stop unvariably
spitting 64 chars by line in LIST. This way, short lines don't use
3 rows per line (the line number uses 3 chars, which brings us to
67 chars per line).

If we don't do that, we end up with the old contents of the line
being kept at the right of the printed line.
2020-11-08 16:43:37 -05:00
Virgil Dupras
4b71f0a344 sms/spi: sample DO when CLK is high
I was sampling DO at the wrong moment, so my input was always
one-off.
2020-11-08 10:24:36 -05:00
Virgil Dupras
2b8524d11e sms: CPORT_CTL is write-only!
why did I think that I could read from it?
2020-11-08 08:43:24 -05:00
Virgil Dupras
7d568bd782 sms: simplify and solidify ports-related drivers
Add _TRA!, _THA!, _TRB!, _THB! routines to easily handle those pins'
value without stepping on other pins like the drivers previously
did. For SDC driver, it's going to be important soon because it turns
out that I can't get away with "always on" CS, so I'll need a scheme
where it's important that TH/TR pins have stable values.
2020-11-02 18:53:57 -05:00
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