DATAMATH CALCULATOR MUSEUM
Texas Instruments TI-2550 II
|Date of introduction:||October 17, 1975||Display technology:||Fluorescent|
|New price:||$49.95||Display size:||8|
|Size:|| 5.8" x 3.2" x
147 x 81 x 32 mm3
|Weight:||6.7 ounces, 190 grams||Serial No:||208610|
|Batteries:||BP2||Date of manufacture:||wk 01 year 1976|
|AC-Adapter:||AC9130, AC9130A||Origin of manufacture:||USA|
|Program steps:||Courtesy of:||Joerg Woerner|
|Download manual:||(US: 2.8 MByte)|
The name gives you a first idea of this calculator: It is the successor of the TI-2550, an extremly wedge shaped basic calculator.
The housing used for the TI-2550 II is identically to the SR-16
the difference is the keyplate and the underlying keyboard frame. The TI-2550 II
uses two sliding switches and a green Vaccum Fluorescent Display, a rare
combination in TI's calculator history.
The TMS1071 discovered in this calculator was the first LSI MOS chip of the TMS1000 family using integrated display drivers, The TMS1001 found in the SR-16 used external drivers in conjunction with a Light Emitted Diode display.
TI-2550 II uses a battery pack BP2 with
only two rechargable AA-sized NiCd batteries compared to the three cells used in
the original BP1/BP1A
This wonderful calculator was quickly replaced by the TI-2550 III, a keyboard without a [+/-] key was not too useful.
A similar calculator chip was used with the innovative Canon MD-8 sporting a multi-line display.
Don't miss the TI-2550 II for the vision impaired people, the Schoenherr Braillotron 2550 II.
If you have additions to the above article please email: firstname.lastname@example.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.