Re: Hardware emulation of 6509 using 6502?

From: Mia Magnusson <mia_at_plea.se>
Date: Wed, 8 Nov 2017 18:21:07 +0100
Message-ID: <20171108182107.0000203e@plea.se>
Den Wed, 08 Nov 2017 17:13:52 +0100 skrev Michał Pleban
<lists@michau.name>:
> Mia Magnusson wrote:
> 
> > Are we even sure how the real 6509 does? Writing a short look that
> > stores data in one or two of the registers and then just loops back.
> > That would produce a load of write pulses if write actually goes
> > out on the external bus, but it won't produce any write pulses
> > (except the spurios ones generated by interrupt service routines
> > e.t.c.) if writing to 0/1 doesn't generate any write pulses.
> 
> I suppose it's done the same way as on the 6510 - how does it look
> there?

I'm not sure, but VIC can display the contents of adress 0/1 as
graphics information so it's possible to check how it is without
opening the case.

:)

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Received on 2017-11-08 18:00:02

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