DATAMATH CALCULATOR MUSEUM
Texas Instruments Constant Memory Module
|Date of introduction:|| Never
(Announced: May 1982)
|New price:||MSRP: $50.00||Display size:|
|Size:|| 1.3" x 1.25" x 0.55"
33 x 32 x 14 mm3
|Weight:||0.45 ounces, 13 grams||Serial No:|
|Batteries:||CR2430||Date of manufacture:||wk 37 year 1982|
|AC-Adapter:||Origin of manufacture:||USA (ATA)|
|Precision:||0-1184||Integrated circuits:||2 x TP531|
|Program steps:||Courtesy of:||Joerg Woerner|
The Constant Memory Module was developed by Texas Instruments for its TI-88 Programmable calculator system and available as an option the calculator.
Don't miss earlier versions of the Constant Memory Modules
included with TI-88 calculators from the DVT
(Design Validation Test) and EVT
(Engineering Validation Test) builds.
Dismantling this Constant Memory Module manufactured in September 1982 by Texas Instruments in their Abilene, Texas facility reveals a printed circuit board (PCB) to accommodate up to two TP530 Memory Chips. The PCB is populated with two TP531 Read/Write Memories (RAM) with unknown capacity and a Sanyo 3 Volts lithium battery with 24.5 mm diameter and a thickness of 3.5 mm - matching today's CR2430 cells.
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© Joerg Woerner, October 12, 2019. No reprints without written permission.