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sms/kbd: PS/2 driver WIP

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This commit is contained in:
Virgil Dupras 2020-05-19 20:52:48 -04:00
parent aad6b5c2e5
commit c86d8a74a0
3 changed files with 26 additions and 0 deletions
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Sega Master System Recipe
622 VDP 630 PAD
640 KBD

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( kbd - implement (ps2kc) for SMS PS/2 adapter )
: (ps2kcA) ( for port A )
( Before reading a character, we must first verify that there
is something to read. When the adapter is finished filling its
'164 up, it resets the latch, which output's is connected to
TL. When the '164 is full, TL is low. Port A TL is bit 4 )
0xdc PC@ 0x10 AND IF 0 EXIT ( nothing ) THEN
0x3f PC@ DROP 0b11011101 ( Port A TH output, low ) 0x3f PC!
0xdc PC@ ( bit 3:0 go in 3:0 ) 0x0f AND ( n )
0b11111101 ( Port A TH output, high ) 0x3f PC!
0xdc PC@ ( bit 3:0 go in 7:4 ) 0x0f AND 4 LSHIFT OR ( n )
( Port A/B reset ) 0xff 0x3f PC!
;

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: (ps2kcB) ( for port B )
( Port B TL is bit 2 )
0xdd PC@ 0x04 AND IF 0 EXIT ( nothing ) THEN
0x3f PC@ DROP 0b01110111 ( Port B TH output, low ) 0x3f PC!
0xdc PC@ ( bit 7:6 go in 1:0 ) 6 RSHIFT ( n )
0xdd PC@ ( bit 1:0 go in 3:2 ) 0x03 AND 2 LSHIFT OR ( n )
0b11110111 ( Port B TH output, high ) 0x3f PC!
0xdc PC@ ( bit 7:6 go in 5:4 ) 0xc0 AND 2 RSHIFT OR ( n )
0xdd PC@ ( bit 1:0 go in 7:6 ) 0x03 AND 6 LSHIFT OR ( n )
( Port A/B reset ) 0xff 0x3f PC!
;