DATAMATH CALCULATOR MUSEUM
Texas Instruments Constant Memory Module (EVT)
|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:||LF-1/2W||Date of manufacture:||wk 17 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.
This Constant Memory Module was included with an early TI-88
EVT (Engineering Validation Test) and sports a a transparent housing to
verify mechanical fit of the integrated backup battery.
Dismantling a Constant Memory Module included with a later TI-88 PVT (Production Validation Test) and 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 from the type LF-1/2W with 24.0 mm diameter and a thickness of 3.0 mm - matching today's CR2430 cells.
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© Joerg Woerner, October 12, 2019. No reprints without written permission.