On Fri, 7 Jun 2002, Sipke de Wal wrote:
> Problem with the 6502 is that different versions
> from different manufacturers had different
> undocumented instructions. So for the general
> public this was not much of a boon ....
True.
> The Z80 situation was much better
>
> Also the 65C02 (the special CMOS version)
> als was more reliable in this respect
The 65C02 actually has additional instructions which invalidate former
"undocumented" instructions on the 6502.
Sellam Ismail Vintage Computer Festival
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Received on Fri Jun 07 2002 - 14:03:48 BST