DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Texas Instruments TI-1500 (1st design)
| Date of introduction: | April 8, 1974 | Display technology: | LED modules + lens |
| New price: | $69.95, DM 148.00 | Display size: | 8 |
| Size: | 5.0" x 2.6" x 1.0" | ||
| Weight: | 7 ounces | Serial No: | 1500011364 |
| Batteries: | 2*AA NiCd | Date of manufacture: | wk 21 year 1974 |
| AC-Adapter: | AC9140, AC9900/C | Origin of manufacture: | USA |
| Precision: | Integrated circuits: | TMS0803 | |
| Memories: | |||
| Program steps: | Courtesy of: | Joerg Woerner | |
| Download manual: | 
(US: 1.357 kB) |
Introduced
1974 the TI-1500 was the successor of the TI-2500 Datamath series. In direct
comparision the TI-1500 with it's stylish, chrom-bordered housing it is only half
of the earlier Datamath's volume.
This original version introduced in 1974 used an odd keyboard
layout. The %-key was placed left from the 0-key instead the usual place in the
top row. This minor flaw was corrected with the 2nd
design of the TI-1500.
Due
to the high pressure on manufacturing costs some other changes were realized
step by step.
 | The
expensive display made of
9 single 7-segment modules borrowed from the SR-50 was replaced first with a LED-stick manufactured by Bowmar and later with an even cheaper LED-stick found in the TI-1200. |
| The two
removable, individual AA-sized NiCd-batteries were replaced finally with a solder-type battery-pack. |
Similar electronics to the TI-1500 was used with the TI-2500-II, the last member of the famous Datamath series. This gives you an idea, why the TI-2500-II uses only two batteries in it's huge battery compartment.
The TI-1500 design was individual, no other TI calculator used later the idea of that shape and appearance.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, October 5, 2002. No reprints without written permission.