15 Feb
2010
15 Feb
'10
3:57 a.m.
Date: Sun, 14 Feb 2010 18:21:34 -0800
From: hilpert at cs.ubc.ca
To: General at invalid.domain
Subject: Nicolet DSO & analog comps / was Re: Getting to dislike tantalum caps
dwight elvey wrote:
Hi
It uses one TMS9900 for the disk drive and another TMS9900 for the
I/O ( GPIB or serial depending on an option module ).
The mainframe use 3 2901 bit slice.
I begining to dislike these things.
I recently got an old 2090 Nicolet DSO ( Digital scope ).
When I got it, it had a blown tantilum on the 5V
for the I/O section. I fixed this and the blown regulator
along with it.
There are two Nicolet DSO at theradio museum here, a 1090A and a 2090-III.
I played with the 1090 when it first arrived a few years ago, until the
switching power supply blew up. I RE'd the power supply to produce the
schematic but didn't get around to repairing it.
The 2090 I haven't even tried powering up yet.
IIRC from when I was working on it, the 1090 is 8080-based. JOOI, have you
determined what microproc the 2090 uses?
I originally got it so that I could display
things from
my analog computer ( That I'm having fun with ).
I powered it up and was just getting the parameters
right for a nice Rose Engine display when the display
went to a defocused dot.
I'm also interested in hearing about analog computer work, would like to go back
to working on programs for mine sometime:
http://www.cs.ubc.ca/~hilpert/e/tyrotek/index.html