Logic Analyzers and In-Circuit Emulators

Eric Smith spacewar at gmail.com
Mon Jan 5 21:04:52 CST 2015

On Mon, Jan 5, 2015 at 7:52 PM, Al  Kossow <aek at bitsavers.org> wrote:
> Has anyone ever noticed a pattern to the numbering on the underside of MMI PALs?

I think those are packaging lot numbers, so they may not have a 1:1
correspondence with part numbers.

> Next thing to do is trace the pinouts and see if the house-marked 6809
> memory mapper is a MC6829.

The Motorola SC67476 is apparently an MC6829. The SC prefix indicates
that it was sold as a custom (or semi-custom) part, so it could have
functional, electrical, or timing differences from the MC6829

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