DATAMATH CALCULATOR MUSEUM
|
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
1.4" 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: | ||
| Precision: | Integrated circuits: | TMS1000NLP | |
| Memories: | |||
| 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.
This
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.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.