The IBM 1620 was a biquinary machine as I recall. The one that I
worked on did not have a disk. I had the machine code manual bought
new from IBM, but do not have it any more.

On Wed, 05 Jan 2005 20:28:40 -0500, Cliff wrote:

On Wed, 05 Jan 2005 15:21:22 -0800, 'Captain' Kirk DeHaan
wrote:

Bugs said the following on 1/5/2005 7:07 AM:
You're making me nostalgic. How about writing in hex? Now that was fun!
Bugs


How about entering code on a front panel keyboard in octal on an old
Heathkit 8 bit computer.

Knew a fellow that was good at it in binary on the IBM 1620 ....
Sort of ended when he made a typo & wiped MONITOR (the OS) from
the disk one night .... nobody in the world seemed to have a copy
of that version ..... made do with a copy of Upjohn's version IIRC.