DATAMATH CALCULATOR MUSEUM
|
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
1.3" 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 |
| Precision: | Integrated circuits: | TMS1071 | |
| Memories: | 1 | ||
| Program steps: | Courtesy of: | Joerg Woerner | |
| Download manual: | 
(US: 2.8M Bytes) |
The
name gives you a first idea of this calculator: It is the successor of the
TI-2550, a wedge shaped basic calculator.
The housing used for the TI-2550 II is identically to the SR-16
II,
the difference is the keyplate and the underlying keyboard frame. The TI-2550 II
uses two sliding switches and a green Vacuum 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.
The
TI-2550 II uses a battery pack BP2 with
only two rechargeable AA-sized NiCd batteries compared to the three cells used in
the original BP1/BP1A
pack.
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: joerg@datamath.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.