360/50 microcode listing
elson at pico-systems.com
Thu May 7 12:16:33 CDT 2015
On 03/13/2015 01:32 PM, Al Kossow wrote:
> CHM was able to obtain volumes 18-20 of the IBM 2050
> drawings, which are
> the microcode charts and ROS dump. I got them scanned and
> uploaded yesterday
> to http://bitsavers.org/pdf/ibm/360/fe/2050
> This was one of the things that I had been trying to
> locate for a while now.
Just a curious thing I've noticed. Given the historic
significance, and the large number of machines produced, I'm
kind of amazed at the incredibly small number of 360's that
Yes, I know, any would-be collector could drag home a PDP-8
and put it in his garage, even a whole rack mount system
with an RK02 (or 3), dectape and paper tape reader, and
still get his car in the garage. And, the system could be
run off normal mains power.
You can't do that with a real 360 (some 360/20's were pretty
small), even a 360/30 was a pretty big box. And, you can't
run a 360 off normal residential power, either. Many of the
peripherals used 3-phase motors, and hacking the
converter/inverter to run off single phase would not be a
task for any but the most experienced EE.
But, it sure is a shame that there appear to be a tiny
number of machines in existence. One list shows 15 or 16
machines, excluding the model 20. Probably there are a
couple more hidden somewhere, like the B1900 that came to
light so recently.
As fas as I can tell, NONE of these systems is complete
enough to ever run, with the possible exception of the
360/30 at the CHM, which does seem to have a complement of
peripherals, and maybe control units, too.
Given the number of DEC 10's that are actually up and
running, this seems a bit of a surprise. there might be
some emotional attachments that are behind this disparity.
Anybody have some comments?
More information about the cctech