[time-nuts] HP8568B firware eproms anyone ?
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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