3 Nov
2010
3 Nov
'10
2:47 p.m.
On 3 Nov 2010 at 20:42, Tony Duell wrote:
Interesting... Why specifically for me, though (other
than I have an
HP9845B which AFAIK uses the same I/O backplane PCB).
I seemed to recall that you specifically have an interest in the old
HP 9800 series. If you don't care for things such as this, I'll make
a note to ignore them.
I am also a little suprised by the comment that logic
analysers didn't
really exist at that time (not that a logic analyser would have been a
lot of help fo this fault). I am wondering how the older HP machines
were actually debugged. Having repaired several of them, I find a
logic alauyser to be next-to-essential. Even more so if the design is
not known to be sound.
Oscope, in particular storage-tube scopes.
The HP 1600A dates from 1976 and was marginally useful. The 1602A
dates from 1978. I remember getting one to evaluate from Electro-
Rents and thought it very cool, but didn't use it all that much. We
had a logic analyzer plugin for the Tek 7400 series scope frame that
was good enough--and lots cheaper.
--Chuck