DATAMATH CALCULATOR MUSEUM
Texas Instruments TM 990/301 Microterminal
|Date of introduction:||1978||Display technology:||LED-stick|
|New price:||Display size:||8|
|Size:|| 5.8" x 3.1" x
148 x 78 x 36 mm3
|Weight:||5.3 ounces, 150 grams||Serial No:||9947040001|
|Batteries:||Date of manufacture:||year 1984|
|AC-Adapter:||Origin of manufacture:|
|Program steps:||Courtesy of:||Joerg Woerner|
The TM 990/301 Microterminal was introduced in 1978 as a small console for the TMS9900 based computer system TM 990/100M.
Microterminal is obviously based on a normal TI-30,
the most successful scientific calculator of that time frame.
Dismantling the TM 990/301 Microterminal discovers a completely different internal construction. Instead the small printed circuit board (PCB) of the TI-30 and all the other calculators using its housing we notice a big PCB based on a TMS1000 single-chip microcomputer. Remember that the TMS1000 is still recognized as the first true microcomputer and found its way into millions of products.
A similar approach using a standard calculator housing for industrial products could be found with the TI-510 PLC Programmer.
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© Joerg Woerner, December 5, 2001. No reprints without written permission.