On Sun, Jul 05, 2009 at 05:55:23PM -0400, B Degnan wrote:
> I noticed the photos from your web site were different.  The P500
> computer came from a place called Vulcan Electronics.  What is the
> benefit/difference with the addon module?

It allows to use eproms instead of roms. The 8K roms used by Commodore have 24
pins, while common 8K eproms (2764) have 28, so they're not pin compatible.

Looking at my own photos, I have to correct my last posting: At least the P500
on the photos does also have eproms. I wil have to check the other one.

> I have uploaded more pictures in the directory listed above.

Even the power supply looks like that one from the 610.

> I should have a 3.6864 MHz crystal someplace to use to replace the
> 1.8432 MHz.  To be honest, I was surprised that the computer worked
> without having to tinker with it.

The crystal is only for the UART. You won't notice if it doesn't work, as long
as you don't use the serial port.

Regards


        Uz


-- 
Ullrich von Bassewitz                                  uz@musoftware.de

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