Re: Hardware emulation of 6509 using 6502?

From: Michał Pleban <*lists_at_michau.name*> Date: Sat, 04 Nov 2017 20:45:32 +0100 Message-ID: <59FE18DC.5050505@michau.name> · lists_at_michau.name

A. Fachat wrote:

> The easiest way to do this is probably hook up two register and a small
> gal to the databus mainly and the sync, r/-w phi2 and prob some more
> signals. Also a 15bit compare on the address bus.
> 
> The gal would monitor the executed opcodes using the sync signal and on
> the right opcode and the right cycle would switch the register values.

My thoughts exactly. For the 15 bit compare, I would probably prefer to
use something like 74LS25, no need to waste PLD pins on something this
trivial.

Regards,
Michau.

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