2016-03-13 23:12:14 +00:00
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; SBC, test decimal mode.
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;
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; NV-BDIZC
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; ??1110??
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;
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; Expected results (I got on Rockwell 6502 AP):
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; 00 - 00 and C=0 gives 99 and N=1 V=0 Z=0 C=0 (B8)
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; 00 - 00 and C=1 gives 00 and N=0 V=0 Z=1 C=1 (3B)
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; 00 - 01 and C=1 gives 99 and N=1 V=0 Z=0 C=0 (B8)
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; 0a - 00 and C=1 gives 0a and N=0 V=0 Z=0 C=1 (39)
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; 0b - 00 and C=0 gives 0a and N=0 V=0 Z=0 C=1 (39)
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; 9a - 00 and C=1 gives 9a and N=1 V=0 Z=0 C=1 (B9)
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; 9b - 00 and C=0 gives 9a and N=1 V=0 Z=0 C=1 (B9)
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;
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*=$0200
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SED
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CLC
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LDA #$00
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SBC #$00
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STA SBT1A
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PHP
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PLA
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STA SBT1F
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SEC
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LDA #$00
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SBC #$00
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STA SBT2A
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PHP
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PLA
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STA SBT2F
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SEC
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LDA #$00
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SBC #$01
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STA SBT3A
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PHP
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PLA
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STA SBT3F
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SEC
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LDA #$0A
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SBC #$00
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STA SBT4A
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PHP
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PLA
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STA SBT4F
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CLC
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LDA #$0B
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SBC #$00
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STA SBT5A
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PHP
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PLA
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STA SBT5F
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SEC
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LDA #$9A
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SBC #$00
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STA SBT6A
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PHP
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PLA
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STA SBT6F
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CLC
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LDA #$9B
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SBC #$00
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STA SBT7A
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PHP
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PLA
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STA SBT7F
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BRK
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*=$0300
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SBT1A: .DB 0
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SBT1F: .DB 0
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SBT2A: .DB 0
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SBT2F: .DB 0
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SBT3A: .DB 0
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SBT3F: .DB 0
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SBT4A: .DB 0
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SBT4F: .DB 0
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SBT5A: .DB 0
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SBT5F: .DB 0
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SBT6A: .DB 0
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SBT6F: .DB 0
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SBT7A: .DB 0
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2016-02-20 23:14:25 +00:00
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SBT7F: .DB 0
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