I have a copy... it was meant to read a program from "drum" memory, a coffee can covered by a piece of paper with the appropriate holes cut it in so paper-clip "brushes" made contact. The problem is that you then had to (if I remember correctly) make the changes in the states of the 'flip-flops' yourself and move to the next instruction... I'll have to find it and check it out... Megan Gentry Former RT-11 Developer +--------------------------------+-------------------------------------+ | Megan Gentry, EMT/B, PP-ASEL,ST| email: mbg at world.std.com | | Member of Technical Staff | megan at savaje.com | | SavaJe Technologies, Inc. | (s/ at /@/) | | 100 Apollo Drive | URL: http://world.std.com/~mbg/ | | Chelmsford, MA 01824 | "pdp-11 programmer - some assembler | | (978) 256 6521 (DEC '77-'98) | required." - mbg KB1FCA | +--------------------------------+-------------------------------------+