mirror of
https://github.com/hsoft/collapseos.git
synced 2024-11-27 12:38:05 +11:00
440ea43a88
Initially, I used the same letters as those used in the z80 ref docs, but it makes the different assemblers harder to use than they should. Having consistent "argtype" rules across assemblers should help.
16 lines
460 B
Plaintext
16 lines
460 B
Plaintext
CODE _status
|
|
A 0b11111101 LDri, ( TH output, unselected )
|
|
PAD_CTLPORT OUTiA,
|
|
PAD_D1PORT INAi,
|
|
0x3f ANDi, ( low 6 bits are good )
|
|
B A LDrr, ( let's store them )
|
|
( Start and A are returned when TH is selected, in bits 5 and
|
|
4. Well get them, left-shift them and integrate them to B. )
|
|
A 0b11011101 LDri, ( TH output, selected )
|
|
PAD_CTLPORT OUTiA,
|
|
PAD_D1PORT INAi,
|
|
0b00110000 ANDi,
|
|
A SLA, A SLA, B ORr,
|
|
PUSHA,
|
|
;CODE
|