74act2155 chips

From: Jules Richardson <julesrichardsonuk_at_yahoo.co.uk>
Date: Tue Nov 16 07:44:00 2004

Anyone know what a 74ACT2155 IC is? Memory of some sort, but is there
anything special about them?

I've managed to pull the NCR Tower into the middle of the garage and
have pulled the covers off - I'll take the disks out later and see if
they spin up first as the machine's somewhat useless if they don't!
After that I'll reseat the boards, check the PSU etc. but I do remember
the machine had developed some sort of fault when I parked it up years
ago. ISTR it being *totally* dead, so there's likely a PSU problem.

Anyway, there are quite a few of these 74ACT2155 chips on little modules
on the system board; one of the modules is labelled as being cache so
they're definitely memory of some flavour - I've just not come across
these with a 74xxx part number before.

NCR didn't half like their PAL chips. I counted over 40 on the system
board alone. There's almost as many as there are typical logic ICs.


Received on Tue Nov 16 2004 - 07:44:00 GMT

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