24 Sep
2011
24 Sep
'11
6:36 a.m.
On Fri, 23 Sep 2011, Tony Duell wrote:
>> , IIRC the 2100A used some odd 'Current
Transfer Logic' ICs).
[...]
I am pretty sure there are some in the 2100A too. I
suspect they're
non-tirival to find now, too which could be a problem meaintaining such a
machine.
They are in the 2100A/2100S and all later HP1000 series machines (except
perhaps the A and L series). They are e.g. used on the I/O bus.
There are some manauls for the older HP2100 series
machines on the
Australian museum site. Some of them include pinouts and brief
chracteristics of the ICs.
You don't need to go that far ;-) Many/most of the manuals are also on
bitsavers (or our local mirror), and the scans are generally in a *much*
better quality.
Christian