Commit Graph

10 Commits

Author SHA1 Message Date
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
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
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
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
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
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