Re: wanted:info on IIe extension

[david@zircon.cs.uow.edu.au (David E A Wilson)]

dempson@actrix.gen.nz (David Empson) writes:
>3. Decimal mode implements the N, V and Z flags, at the expense of one
>additional clock cycle for each ADC/SBC in decimal mode.

Does anyone have a Rockwell R65C02 in their computer? According to the Rockwell
data book I have, the R65C02 only fixes the N flag - the Z flag is still invalid
after an ADC or SBC in decimal mode. This would be easy to check:

	LDA	#$99
	CLC
	SED
	ADC	#$01
	CLD
	BRK

At this point N should be clear, Z should be set. I guess this would be unlikely
to cause problems as most code would be assuming a 6502 and ignoring the flags.