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Commit Graph

12 Commits

Author SHA1 Message Date
Virgil Dupras
5ca99ad410 trs80: implement a standalone RS-232 driver
No more relying on the TRS-DOS driver!
2020-12-25 16:54:02 -05:00
Virgil Dupras
da72d7bbe1 doc: add TRS-80 4P keyboard cheat sheet 2020-12-17 15:32:13 -05:00
Virgil Dupras
35dca04ec9 doc/sms/at28: add note about CE-inhibit jumper 2020-12-12 10:47:30 -05:00
Virgil Dupras
374a0a8e46 doc: update AT28 instructions for new ~AT28 routine 2020-12-09 20:44:04 -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
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
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
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