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avra: rename AGAIN, to AGAIN?,
AGAIN, becomes a shortcut for "' RJMP AGAIN?,"
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@ -10,6 +10,6 @@
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( L1 FLBL, .. L1 ' RJMP FLBL! )
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: FLBL, ( l -- ) LBL! 0 A,, ;
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: FLBL! ( l opw -- ) SWAP @ TO, ;
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: BEGIN, PC ;
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: AGAIN, ( op ) SWAP 1- SWAP EXECUTE A,, ;
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: BEGIN, PC ; : AGAIN?, ( op ) SWAP 1- SWAP EXECUTE A,, ;
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: AGAIN, ['] RJMP AGAIN?, ;
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: IF, ['] BREQ SKIP, ; : THEN, TO, ;
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@ -210,7 +210,7 @@ BEGIN,
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20 LSL,
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PORTB CP SBI,
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16 DEC,
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' BRNE AGAIN, ( not zero yet? loop )
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' BRNE AGAIN?, ( not zero yet? loop )
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( release PS/2 )
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DDRB DATA CBI,
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SEI,
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@ -239,7 +239,7 @@ L2 ' RCALL LBL, ( resetTimer )
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BEGIN,
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16 TIFR IN,
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16 1 ( TOV0 ) SBRS,
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' RJMP AGAIN,
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AGAIN,
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( Good, 100us passed. )
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( Pull Data low, that's our start bit. )
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PORTB DATA CBI,
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@ -257,36 +257,36 @@ DDRB CLK CBI, ( Should be starting high now. )
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BEGIN,
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( Wait for CLK to go low )
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BEGIN, PINB CLK SBIC, ' RJMP AGAIN,
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BEGIN, PINB CLK SBIC, AGAIN,
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( set up DATA )
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PORTB DATA CBI,
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19 0 SBRC, ( skip if LSB is clear )
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PORTB DATA SBI,
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19 LSR,
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( Wait for CLK to go high )
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BEGIN, PINB CLK SBIS, ' RJMP AGAIN,
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BEGIN, PINB CLK SBIS, AGAIN,
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16 DEC,
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' BRNE AGAIN, ( not zero? loop )
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' BRNE AGAIN?, ( not zero? loop )
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( Data was sent, CLK is high. Let's send parity )
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19 1 MOV, ( recall saved value )
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L6 FLBL, ( RCALL checkParity )
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( Wait for CLK to go low )
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BEGIN, PINB CLK SBIC, ' RJMP AGAIN,
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BEGIN, PINB CLK SBIC, AGAIN,
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( set parity bit )
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PORTB DATA CBI,
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16 0 SBRC, ( parity bit in r16 )
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PORTB DATA SBI,
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( Wait for CLK to go high )
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BEGIN, PINB CLK SBIS, ' RJMP AGAIN,
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BEGIN, PINB CLK SBIS, AGAIN,
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( Wait for CLK to go low )
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BEGIN, PINB CLK SBIC, ' RJMP AGAIN,
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BEGIN, PINB CLK SBIC, AGAIN,
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( We can now release the DATA line )
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DDRB DATA CBI,
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( Wait for DATA to go low, that's our ACK )
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BEGIN, PINB DATA SBIC, ' RJMP AGAIN,
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BEGIN, PINB DATA SBIC, AGAIN,
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( Wait for CLK to go low )
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BEGIN, PINB CLK SBIC, ' RJMP AGAIN,
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BEGIN, PINB CLK SBIC, AGAIN,
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( We're finished! Enable INT0, reset timer, everything back to
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normal! )
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L2 ' RCALL LBL, ( resetTimer )
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@ -320,6 +320,6 @@ BEGIN,
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19 LSR,
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' BRCC SKIP, 16 INC, ( carry set? we had a 1 ) TO,
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19 TST, ( is r19 zero yet? )
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' BRNE AGAIN, ( no? loop )
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' BRNE AGAIN?, ( no? loop )
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16 0x1 ANDI,
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RET,
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