Assertion: decimal point's value | /r/HasProperty | undocumented behavior
Facets:
value: on 65816
type: TEMPORAL
value: in decimal mode
type: OTHER
value: effectively
type: MANNER
value: on the 6502
type: TEMPORAL
Source sentences:
text: To summarize, on the 6502, the value of the N, V, and Z flags when both BCD numbers are valid and the value of the accumulator, N, V, Z, and C flags when one or both BCD number are invalid is undocumented behavior.
text: Even though the 65C02 and 65816 datasheets state the V flag is valid (it is invalid on the 6502, however), ADC and SBC perform unsigned BCD arithmetic, and the V flag has meaning for signed rather than unsigned arithmetic, so the the value (and meaning) of the V flag is effectively undocumented in decimal mode.
text: On the 65C02 and 65816, the value of the V flag (despite the claim in the datasheet that it is valid) when both BCD numbers are valid and the value of the accumulator, N, V, Z, and C flags when one or both BCD number are invalid is undocumented behavior.