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