DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Texas Instruments TI-2550-IV
| Date of introduction: | 1978 | Display technology: | Fluorescent |
| New price: | Display size: | 8 | |
| Size: | 5.8" x 3.2" x 1.3" | ||
| Weight: | 8 ounces | Serial No: | 30391 |
| Batteries: | BP4 | Date of manufacture: | wk 17 year 1979 |
| AC-Adapter: | AC-9900/H | Origin of manufacture: | Turkey |
| Precision: | Integrated circuits: | TMC1981, TMC0999 | |
| Memories: | 1 + 20 Playback | ||
| Program steps: | Courtesy of: | Joerg Woerner | |
| Download manual: | 
(EUR: 5.949 kB) |
With
the TI-2550-IV Texas Instruments introduced a new feature into the TI-2550
series, the Playback mode known from the TI-1680. Similar to a paper printout you can scroll back
up to 20 of your entries and do some corrections. Due to the missing
ON/OFF-switch and only 24 instead of 28 keys known from the TI-2550
III the calculator looks somewhat unusual.
Due to its late introduction, this calculator was never a success
for Texas Instruments. We assume that it was sold only in some European
countries. Up to now we discovered the pictured calculator assembled in Turkey
and one model assembled in Italy.
The
internal construction of the TI-2550-IV is once again different from the former TI-2550
II and TI-2550 III, we notice another battery pack BP4
and the electronic circuits of the TI-1680.
Read more about the memory operations possible with just the [M] and [MR] keys here.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.