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DATAMATH CALCULATOR MUSEUM

Texas Instruments SR-56 Programmable

Date of introduction:	1976	Display technology:	LED-stick
New price:	$139	Display size:	10 + 2
Size:	5.8" x 3.2" x 1.3" 147 x 81 x 32 mm³
Weight:	8.5 ounces, 240 grams	Serial No:	152051
Batteries:	BP1A	Date of manufacture:	wk 08 year 1977
AC-Adapter:	AC9130A	Origin of manufacture:	USA (LTA)
Precision:	12/13	Integrated circuits:	TMC0501, TMC0537, TMC0538. TMC0599
Memories:	10
Program steps:	100	Courtesy of:	Joerg Woerner
		Download manual:	(US: 15.0M Bytes) (US: 13.1M Bytes) (US: 26.8M Bytes)

Introduced only few month after the SR-52 programmable, the SR-56 was it's small brother. The housing looked identical to the SR-51A, only the LRN-key gave you an idea of it's programmability. Compared to the SR-52 it uses only one instead of two memory-chips (the TMC0599), this reduced the possible program length from 224 steps to 100 steps. Main disadvantage was the lack of a permanent storage like a card reader or the continuous memory of the later TI-58C.

This calculator works with both the PC-100 and PC-100A printer cradle.

There are two different versions of the calculator reported, one with and one without the word "Programmable" under the SR-56 logo.

Fellow collectors - if you own a SR-56 please report us the serial number and date code on the back of the calculator for our SR-56 Database.

If you have additions to the above article please email: joerg@datamath.org.