Re: C64 PCB

From: silverdr_at_wfmh.org.pl
Date: Fri, 19 Jul 2013 19:05:54 +0200
Message-Id: <8AAFA31C-8D14-456A-AF8B-E37DD0803825@wfmh.org.pl>
On 2013-07-19, at 14:41, Nicolas Welte wrote:

>>> Actually I think I'll check whether I can make it two somehow. Should be possible. At some PCB size cost of course.
>> 
>> It depends on how the PCB is laid out I guess. I have TTL chips over the
>> ROM sockets, so I would need to move them elsewhere to accommodate
>> different chip spacings on one PCB...
> 
> I admit I didn't read the whole thread, but if you want to attach something to the three ROM sockets in a C64, you know that all data and address lines are the same on all sockets, and the difference is only in the three chip select lines? So it's enough to attach to one socket and pick up the remaining chip select lines from the other sockets with a wire,

That's (almost) exactly what I did.

> or maybe you can have a PCB with different holes for different ROM spacings for only these two signals.

And this is exactly what I plan to do for the next revision.

> This should work well as long as you don't choose the character ROM socket because this might lack one address line.

As Michau wrote - there is one more thing: SX-64 has both outer ROMs swapped but I plan to handle this as well. The middle ROM socket is always the best bet anyway.

-- 
SD!

P. S. Nicolas, how can I reach you on private e-mail? I tried the addresses I found but to no result so far. Or maybe you could write me?


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Received on 2013-07-19 18:00:05

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