--- /dev/null
+
+--------------------------------------------------------------------------------
+| | C Flag | HEX value in | H Flag | HEX value in | Number | C flag |
+| Operation | Before | upper digit | Before | lower digit | added | After |
+| | DAA | (bit 7-4) | DAA | (bit 3-0) | to byte | DAA |
+|------------------------------------------------------------------------------|
+| | 0 | 0-9 | 0 | 0-9 | 00 | 0 |
+| ADD | 0 | 0-8 | 0 | A-F | 06 | 0 |
+| | 0 | 0-9 | 1 | 0-3 | 06 | 0 |
+| ADC | 0 | A-F | 0 | 0-9 | 60 | 1 |
+| | 0 | 9-F | 0 | A-F | 66 | 1 |
+| INC | 0 | A-F | 1 | 0-3 | 66 | 1 |
+| | 1 | 0-2 | 0 | 0-9 | 60 | 1 |
+| | 1 | 0-2 | 0 | A-F | 66 | 1 |
+| | 1 | 0-3 | 1 | 0-3 | 66 | 1 |
+|------------------------------------------------------------------------------|
+| SUB | 0 | 0-9 | 0 | 0-9 | 00 | 0 |
+| SBC | 0 | 0-8 | 1 | 6-F | FA | 0 |
+| DEC | 1 | 7-F | 0 | 0-9 | A0 | 1 |
+| NEG | 1 | 6-F | 1 | 6-F | 9A | 1 |
+|------------------------------------------------------------------------------|
+
+Flags:
+C: See instruction.
+N: Unaffected.
+P/V: Set if Acc. is even parity after operation, reset otherwise.
+H: See instruction.
+Z: Set if Acc. is Zero after operation, reset otherwise.
+S: Set if most significant bit of Acc. is 1 after operation, reset otherwise.
git.joshuawise.com / fpgaboy.git / blobdiff