Re: Hardware emulation of 6509 using 6502?

From: Mia Magnusson <mia_at_plea.se>
Date: Wed, 4 Jul 2018 00:38:22 +0200
Message-ID: <20180704003822.0000651b@plea.se>
Den Tue, 03 Jul 2018 19:52:52 +0200 skrev Michał Pleban
<lists@michau.name>:
> Jim Brain wrote:
> 
> > Though I have a few different logic analyzers (8 channel, 34
> > channel, etc.), my most useful Logic Analyzer is an older HP 1650B
> > (80 channel, an awesome unit, BTW, for which I did not pay much),
> > which does not have a huge memory.  However, it has extensive
> > triggering capabilities.
> > 
> > The easiest way to test would be to provide me with the address you
> > want to start the trace at, and I will set that as a trigger.
> 
> How much information can it hold BEFORE the trigger? Because I think
> the best place to set the trigger would be the branch where the KERNAL
> decides that the memory test is not successful. Then we could look
> back and see what happened before - what it was fetching, what it
> got, what it was expecting instead, etc.
> 
> I will consult the KERNAL disassembly and find this point.

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?

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Received on 2018-07-04 01:00:04

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