Subj : Cpu Display
To   : All
From : MIKE ROSS
Date : Thu Sep 22 2005 10:59 pm

Hi,

I came across a funny cpu speed display in an old box with a newer
board in it. It is a full 3 digit type but it has an IC marked F51231E
and a small watch battery. At first I thought this was for a clock but
on closer inspection the IC is seems to be a programmable 7 segment
decoder and the watch battery is for backing up its data. There are
also 3 transistors which are used as inverters for the digit decoding.
The oddest thing is that in addition to the usual connection to the
turbo switch it also has a connection to the reset switch.

My question then is how is this thing programmed?

These are the pin markings over the pcb header,
    Label:  L   T   H   R   R   +   -   S   S   T
Connector:  nc  TB-LED  RESET   POWER   TB-SWITCH

Any info is welcome.

 M*i*k*e

.... Do computers on ships run Microsoft Portholes?
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 * Origin: Juxtaposition BBS, Telnet:juxtaposition.dynip.com (1:167/133)

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