(Fwd) IBM 1401

From: Gene Ehrich <gehrich_at_tampabay.rr.com>
Date: Sat Mar 16 07:46:01 2002

At 08:27 PM 3/15/02 -0800, you wrote:
>Machine Language Instructions
>Instruction Operation A Address B Address d-Char Comments
> Address Code
> 0378 1 READ A CARD
> 0379 M 0009 0230 MOVE CHARACTER
> 0388 M 0029 0250 MOVE CHARACTER
> 0397 2 WRITE A LINE
> 0398 / 0378 0299 CLEAR AND BRANCH

And punch a card was OpCode 4.

Op codes could be combined so the OpCode 7 was read/write/punch. You could
make the machine real busy by putting a 7 with a word mark throughout
storage using the switches on the console.
Received on Sat Mar 16 2002 - 07:46:01 GMT