DATAMATH CALCULATOR MUSEUM
Texas Instruments TI Programmable 57
|Date of introduction:||May 24, 1977||Display technology:||LED-stick|
|New price:|| $79.95, £49.95
$40.00 (October, 1981)
|Display size:||8 + 2|
|Size:|| 5.8" x 3.1" x
148 x 78 x 36 mm3
|Weight:||6.4 ounces, 180 grams||Serial No:||1246799|
|Batteries:||BP6, BP7||Date of manufacture:||wk 32 year 1977|
|AC-Adapter:||AC9131, AC9132||Origin of manufacture:||USA|
|Program steps:||50||Courtesy of:||Joerg Woerner|
|Download leaflet:||(US: 2.2 MByte)||Download manual:||(DE: 13.1 MByte)|
Introduced together with the TI-58 and TI-59 the TI-57 represented the low budget programmable calculator of that epoch and replaced the SR-56. Unbelievable that this powerful calculator made use of the one-chip approach of the SR-40 calculator.
A sales brochure of 1977 says:
"The key to its value is a remarkable advance in integrated circuit
technology - a single MOS/LSI chip with the equivalent capacity of 30,000
transistors". Well, today the guys of TI integrate millions and millions of
transistor on one chip.
A novel step was the squeezing of key entries into program code, the time before the memory hold the key codes. This technique allowed up to 3 key entries (i.e. INV-2nd-sin) to be compressed into one program step. Sure that marketing sold a calculator with 50 memory places as a calculator with 150 program steps!
Please read this interesting comment from Anders Persson: "However, it was actually possible to pack up to four keystrokes in one step, not only three. An instruction like INV-2nd-Prd-4 would still fit in one step (code -39 4). Admittedly, not many instructions took four keystrokes - perhaps this is the only one...".
If you are interested in the calculating accuracy of scientific calculators don't miss the Calculator forensics.
Find a nice collection of program listings for the TI-57 on Laurent Bonnin's website.
Early in production (about wk 36 year 1977) TI changed the battery pack and the related connector and charger from the SR-51-II style to the TI-55 style. The battery packs are not compatible, don't use a BP6 with a AC9132 charger !
Simply by comparing the designation of the integrated circuits of the upper line "Majestic" calculators, you'll get the all members of this family:
| TMC1501 TI-57
Later in production the metallized TI logo was replaced with
an unmetallized. This gives in total 3 different US versions. View here the TI-57
w/o chrome. Finally we should add an early TI-57
assembled in Italy with different styling.
The TI-57 was sold under the label of Radio Shack as EC-4000.
The calculator was available till 1982.
|TI Programmable 57
The self-teaching programming system for student and professionals.
Eight multi-use memories provide addressable memory locations to store and recall data. Powerful program memory stores 50 fully merged steps (up to 150 key-strokes). Once a program is built, it can be executed repeatedly by supplying new sets of variables. Computer-like programming functions help solve repetitive problems quickly and accurately.
© Texas Instruments, 1981
If you have additions to the above article please email: firstname.lastname@example.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.