Re: Hardware emulation of 6509 using 6502?

From: Michał Pleban <*lists_at_michau.name*> Date: Wed, 04 Jul 2018 10:17:23 +0200 Message-ID: <5B3C8293.6020501@michau.name> · lists_at_michau.name

Mia Magnusson wrote:

> If it can store at least a bit of data before the trigger, how about
> just trigger it on the bank outputs of the CPU being anything else than
> bank 15?

That would be too early. We don't want to find what heppens when the CPU
_starts_ testing the RAM. We want to find out what caused the CPU to
_stop_ testing the RAM - that's when the error occurs. And we don't know
when it really occurs. For what it's worth, it could be testing 65535
bytes correctly and bail out on the 65536-th (not that I consider it
likely, but you don't really know).

Regards,
Michau.