Additional Pictures 


This IMCO DrilMod calculator was manufactured in January 1982 by
Texas Instruments in Abilene, TX (Date code ATA 0182 wk 01 yr 1982).

The IMCO DrilMod module.

Inside the module we located
a standard TMC0540 with a 
ZA5511 ROM-Code.

The base calculator of this IMCO DrilMod calculator is a
standard TI-59 manufactured in 1982 and serviced in 1983.

horizontal rule

If you have additions to the above article please email:

Joerg Woerner, April 3, 2021. No reprints without written permission.