DATAMATH CALCULATOR MUSEUM
Texas Instruments TI-1000 (silver)
|Date of introduction:||1978||Display technology:||LED-stick|
|New price:||$9.77||Display size:||8|
|Size:|| 5.4" x 2.8" x
138 x 72 x 32 mm3
|Weight:||3.0 ounces, 84 grams||Serial No:|
|Batteries:||9V||Date of manufacture:||wk 43 year 1978|
|AC-Adapter:||AC9180||Origin of manufacture:||USA (LTA)|
|Program steps:||Courtesy of:||Joerg Woerner|
|Download manual:||(US: 0.8M Bytes)|
the original TI-1000 introduced in June 1977 sports a
golden trim around the keyboard, changed Texas Instruments the design in Summer
1978 to a silver-gray finish.
Dismantling both generations of the TI-1000 reveals a surprise! The earlier model uses an internal construction with a small printed circuit board (PCB) similar to the TI-30 while later model looks with its larger flexible PCB more like a TI-50. The picture shows on the left a TI-1000 manufactured in 1977, the TI-1000 on the right was assembled in 1978.
The most important difference are the two single-chip calculator circuits used with the early and later TI-1000s:
• TI-1000 (1977):
TMC1991 packaged in 28-pin SPDIP (Shrink Plastic Dual In-line Package) with Die-up (standard pinout) on
a two-sided Rigid-PCB
• TI-1000 (1978): TMC1992 packaged in 28-pin SPDIP (Shrink Plastic Dual In-line Package) with Die-down (reverse pinout) on a single-sided Flex-PCB
The use of a single-sided PCB was made possible with an unconventional approach of scanning the keyboard switch-matrix with 10 dedicated pins (6 row outputs, 4 column inputs) instead of using either the digit-driver outputs or segment-driver outputs for the keyboard rows.
Calculators with different keyplates were sold from Western Auto as Citation.
The two different internal designs of the TI-1000 calculators are used with the Little Professor (1978), too.
If you have additions to the above article please email: email@example.com.
© Joerg Woerner, January 4, 2002. No reprints without written permission.