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
126 x 66 x 26 mm3
|Weight:||4.9 ounces, 139 grams||Serial No:||1500011364|
|Batteries:||2*AA NiCd||Date of manufacture:||wk 21 year 1974|
|AC-Adapter:||AC9140, AC9900/C||Origin of manufacture:||USA|
|Program steps:||Courtesy of:||Joerg Woerner|
|Download manual:||(US: 3.2M Bytes)|
Introduced in 1974 the TI-1500 was the successor of the TI-2500 Datamath series. In direct comparison the TI-1500 with its rather small, yet stylish chrome-bordered housing it is only about one half of the earlier Datamath's volume and two-third of its weight.
This original version introduced in 1974 used an odd keyboard
layout. The [%] key was placed left from the  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.
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 cheape
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.
Ken Shirriff studied the United
States Patent Application
describing the TMS0800 architecture and the program code used with the
TI-1500 very carefully and was
for the TMS0800 simulating a (slightly modified)
Don't miss the Miracle of the Sinclair Scientific!
The TI-1500 design was individual, no other TI calculator used later the idea of that shape and appearance.
The TI-1500 is featured in the Texas Instruments Deutschland GmbH leaflet ER-1975 dated 1975.
If you have additions to the above article please email: firstname.lastname@example.org.
© Joerg Woerner, October 5, 2002. No reprints without written permission.