[time-nuts] HP8568B firware eproms anyone ?

Poul-Henning Kamp phk at phk.freebsd.dk
Fri Oct 20 02:25:53 EDT 2006

In message <PKEGJHPHLLBACEOICCBJCENMIJAA.jmiles at pop.net>, "John Miles" writes:

>Actually, since each EPROM is now 4x bigger than necessary, couldn't you do
>all this with just one chip?  The circuit must be decoding a couple of
>high-order address lines to drive the chip-select pins of the other three
>EPROMs, so you'd just tie those two address lines to the unused address pins
>of your new EPROM.

I seriously thought about that.  The address decoding is done by a PAL
however, and adding the necessary glue logic would have taken more
effort than a few seconds with the Dremel :-)

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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