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collapseos/arch/z80/sms/blk/626

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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
CODE _TRB! HL POP, chkPS, ( B0 -> B6, B1 -> B2 )
L RR, RLA, RLA, RLA, RLA, L RR, RLA, RLA, RLA,
sms: CPORT_CTL is write-only! why did I think that I could read from it?
2020-11-08 08:43:24 -05:00
0x44 ANDi, L A LDrr, CPORT_MEM LDA(i),
0xbb ANDi, L ORr, CPORT_CTL OUTiA, CPORT_MEM LD(i)A,
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
;CODE
CODE _THB! HL POP, chkPS, ( B0 -> B7, B1 -> B3 )
L RR, RLA, RLA, RLA, RLA, L RR, RLA, RLA, RLA, RLA,
sms: CPORT_CTL is write-only! why did I think that I could read from it?
2020-11-08 08:43:24 -05:00
0x88 ANDi, L A LDrr, CPORT_MEM LDA(i),
0x77 ANDi, L ORr, CPORT_CTL OUTiA, CPORT_MEM LD(i)A,
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
;CODE
CODE _D1@ CPORT_D1 INAi, PUSHA, ;CODE
CODE _D2@ CPORT_D2 INAi, PUSHA, ;CODE
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