This was probably a prototype.
On Wed, 12 Dec 2001, Nicolas Welte wrote:
> 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.
>
> Nicolas
>
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>
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