Re: 1551 Repair - 28 pin 6523 Wanted

From: Marko Mäkelä <>
Date: Wed, 5 Mar 2014 23:38:24 +0200
Message-ID: <20140305213824.GA4044@x220>
Hi John,

On Wed, Mar 05, 2014 at 08:06:27PM +0000, John McKenna wrote:
>That would make '/IRQ', '/RES', 'O2', and 'XX' simply standard I/O pins 
>which have been given funny names by the person who drew the schematic.

This could still make some sense, if these GPIO pins on the 264-side 
cartridge are connected to some control signals inside the 1551. It 
certainly makes some sense to control the 1551 /RESET signal from the 
264. I am not so sure about /IRQ, and I guess that in this case, O2 
would have to be something else than Phi2.

I guess that your best bet is to check MESS, hoping that it really 
emulates the interface, instead of faking it with some hooks.


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Received on 2014-03-05 22:00:08

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