DATAMATH CALCULATOR MUSEUM
|Date of introduction:||December 1973||Display technology:||Panaplex II|
|New price:||$84.95||Display size:||8|
|Size:|| 9.7" x 7.0" x
246 x 177 x 59 mm3
|Weight:||32 ounces, 908 grams||Serial No:||Production batch 02405|
|Batteries:||Date of manufacture:||mth 12 year 1973|
|AC-Adapter:||120 V or 240 V||Origin of manufacture:||USA|
|Program steps:||Courtesy of:||Joerg Woerner|
|Download manual:||(US: 4.4M Bytes)|
This Heathkit IC-2108 was the third desktop calculator in a line started with the IC-2008 and followed by the IC-2008A before the IC-2100 introduced in December 1974 marked the end of Heath' kit calculators. The new design of the IC-2108 gives a very sleek profile that fits easily into a brief case.
Dismantling the featured Heathkit IC-2108 sold in
December 1973 to an American hobbyist and assembled in picture-perfect quality, reveals a design centered around a Texas Instruments
TMS0119 single-chip calculator circuit on
a conveniently large printed circuit board (PCB) surrounded by the power supply and many
discrete transistors and other components.
The TMS0119 is a member of the TMS0100 Product Family introduced already in September with the TMS1802, later renamed to TMS0102. Other applications of the TMS0119 are different versions of the TI-2500 Datamath calculator manufactured between September 1972 and mid of 1974 including the TI-2510.
The Main-PCB is connected in typical Heathkit tradition with individual wires to the Keyboard-PCB and a third PCB with discrete high-voltage drivers and three 3-digit Sperry SP-753 planar neon gas discharge "Panaplex II" display modules.
The Keyboard-PCB is using eighteen individual short-stroke
push-button switches for the numbers and functions and three rocker switches for
power, constant and a configurable (during assembly of the calculator with a
wire) decimal point.
The IC-2108 calculator was available till May 1974, the priced dropped within a few months down to $69.95.
If you have additions to the above article please email: firstname.lastname@example.org.
© Joerg Woerner, January 11, 2002. No reprints without written permission.