Additional Pictures 


This Pool Water Analysis calculator was manufactured in April 1979 by
Texas Instruments in Abilene, TX (Date code ATA 1779 wk 17 yr 1979).

The backside of the Pool Water Analysis calculator with the battery and lid of the
Solid State Software Module compartment removed.

The OLIN Pool Water Analysis module
with copyrights from 1979.

Inside the module we located
a standard TMC0540 with a 
ZA5539 ROM-Code.

The base calculator of this Pool Water Analysis calculator is a
standard TI-58C manufactured in 1979.

horizontal rule

If you have additions to the above article please email:

Mark Bollman and Joerg Woerner, August 3, 2008. No reprints without written permission.