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2 changed files with 11 additions and 25 deletions

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@ -559,14 +559,16 @@ handleLDrr:
handleRST: handleRST:
ld a, (INS_CURARG1+1) ld a, (INS_CURARG1+1)
; verify that A is either 0x08, 0x10, 0x18, 0x20, 0x28, 0x30 or 0x38. ; verify that A is either 0x08, 0x10, 0x18, 0x20, 0x28, 0x30 or 0x38.
; Good news: the relevant bits (bits 5:3) are already in place. We only ; Good news: they're all multiples of 8.
; have to verify that they're surrounded by zeroes. ; to verify that we're within range, we to 8-bit rotation. If any of
ld c, 0b11000111 ; the first 3 bytes are set (thus not a multiple of 8), the cp 8
and c ; later will yield NC because those bits will now be upwards.
jr nz, .error rrca \ rrca \ rrca
; We're in range. good. cp 8
ld a, (INS_CURARG1+1) jr nc, .error
or c ; good, we have a proper arg. Now let's get those 3 bits in position
rlca \ rlca \ rlca
or 0b11000111
ld (INS_UPCODE), a ld (INS_UPCODE), a
ld c, 1 ld c, 1
ret ret

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@ -1,27 +1,12 @@
# TI-84+ # TI-84+
The TI-84+ is a machine with many advantages, one being that it's very popular. **This is a work-in-progress**
It also has a lot of flash memory and RAM.
Its builtin keyboard and screen, however, are hard to use, especially the
screen. With a tiny font, the best we can get is a 24x10 console.
There is, however, a built-in USB controller that might prove very handy.
## Recipe ## Recipe
This recipe gets the Collapse OS shell to run on the TI-84+, using its LCD This recipe gets the Collapse OS shell to run on the TI-84+, using its LCD
screen as output and its builtin keyboard as input. screen as output and its builtin keyboard as input.
## Gathering parts
* [zasm][zasm]
* A TI-84+ (TI-83+ compatibility is being worked on. See issue #41)
* A USB cable
* [tilp][tilp]
* [mktiupgrade][mktiupgrade]
* Optional: [z80e][z80e] to emulate
## Build the ROM ## Build the ROM
Running `make` will result in `os.rom` being created. Running `make` will result in `os.rom` being created.
@ -89,7 +74,6 @@ a "normal" key. The presses must be sequential.
Keys that aren't a digit, a letter, a symbol that is part of 7-bit ASCII or one Keys that aren't a digit, a letter, a symbol that is part of 7-bit ASCII or one
of the two mode key have no effect. of the two mode key have no effect.
[zasm]: ../../tools/emul
[knightos]: https://knightos.org/ [knightos]: https://knightos.org/
[z80e]: https://github.com/KnightOS/z80e [z80e]: https://github.com/KnightOS/z80e
[mktiupgrade]: https://github.com/KnightOS/mktiupgrade [mktiupgrade]: https://github.com/KnightOS/mktiupgrade