31 Aug
2012
31 Aug
'12
11:42 a.m.
On 8/30/12 4:41 PM, Colin Eby wrote:
That cannot be from a PERQ 1a.
The PERQ modles that I've come across are :
PERQ 1 : 4K WCS CPu (20 bit ALU path), portrait monitor, SA4000
wincheseter drive. CIO board (no ethernet). GPIB tablet
PERQ 1a : as PERQ 1, but with the 16K WCS CPU (still 20 bit path)
PERQ 2 T1 : 16K CPU. portrait (normally, ladnscape is possible) monitor,
revised case design. Micropolis 1203 winchester. EIO board (complete
redesign).. Normally Kriz table, but the GPIB oen is possible too.
PERQ 2 T2 : As 2 T1, but with a 5.25" ST412-type winchester. Normally a
landscape monitor
PERQ 2 T4. : As 2 T2, but with a CPU board with 24 bit ALU path. It is
very unlikely you have this one
PERQ 3a (AGW3300) : A PERQ in name only. It's a 68020 unix box, albeit
with a microcoded graphics processor.
Be assured, we are doing tactical
scanning and imaging, and planning for a pervasive approach
do you have the documentation for the Micropolis disk drive and
custom PERQ interface board? Will Donzelli sent me a drive, and I realized once I looked at it that I have no way to
do anything
with it without documentation.
What sort of drive is it? THe Microposls 1203 (8") was used in the 2T1,
the 1300 series (5.25") were used in soem 2T2s.
For the 2T2, it's a normal ST412 type of device. although the sector
headers will be odd (they contain file system pointers, a la Xerox?). The
little interface board (aka 'DIB' == Disk Interface Board) sits on top of
the drive. There's a schematic in the 2T2 schematics book on bitsavers.
The 8" Micropolis 1203 and its DIB is a bit harder. The 2T1 was partially
an ICL design, and AFAI Kthey designed the DIB. There is no known
official schematic for the DIB. I have a hand-drawn one, I also have some
notes on the drive itself.
If you are serious about figuring this out, you'll need the dumps of the
PROms and PAL equations. I have tried to send those to you a couple of
times, and given up...
-tony