Re: PET II questions (P500, B128, B256)

From: Nicolas Welte (
Date: 2001-12-12 11:30:31

William Levak wrote:
> 2364 ROMs can be replaced by Motorola 68764 or 68766 EPROMs, except in the
> IEEE disk drives where they will not work because of timing differences.

For some very strange reason CBM had two versions of the 8250LP board, one
that uses 2364 ROMs and one that uses 2564 EPROMs. The 2564 version does not
work with ROMs, because CBM used the extra CS inputs on the 2564. I have no
idea why they did this. I think the SFD1001 has jumpers to select between
ROMs and EPROMs, and the SX64 can just accept a ROM in its 2564 socket
without any hassles.


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