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Texas Instruments TI-5050M

Date of introduction:  June 1976 Display technology:  
New price:  $129.95, 99.00 Display size:  n.a.
Size:  8.6" x 3.9" x 2.5"
 218 x 98 x 63 mm3
Printer technology:  Thermal TP-20225
Weight:  28.2 ounces, 802 grams Serial No:  85310
Batteries:  6*AA NiCd Date of manufacture:  1976
AC-Adapter:  AC9171 Origin of manufacture:  USA
Precision:  10 Integrated circuits:  TMS1115
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner
    Download manual:   (US: 5.7M Bytes)

Texas Instruments introduced already in June 1976 the successor of the TI-5050 introduced just 15 months earlier. Main differences from the users point of view are one additional memory and some improvements in the algorithm used for the division.

Dismantling this TI-5050 manufactured in 1976 by Texas Instruments in the USA reveals a designed centered around a member of the famous TMS1000 Microcomputer family. The TMS1115 is manufactured in PMOS (p-channel metal-oxide-semiconductor) technology similar to the original Canon Pocketronic and features 2k*8 Bits ROM plus 128*4 bits RAM in a 28-pin DIP (Dual In-line Package) housing.

Please notice that the original design of the TI-5050 is centered around two TMS1000 chips labeled TMC1014 and TMS1214, both sporting just 1k*8 Bits ROM plus 64*4 bits RAM, each. A similar evolutionary step was observed in 1978 with the TI-5040, switching from a two-chip design based on a TMC1115 (ZA0351) and TMC1276 to a single-chip design with a TMC0261 chip.

Don't miss the twin brother Radio Shack EC-3001 and the similar but different TI-5015.


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

Joerg Woerner, December 5, 2001. No reprints without written permission.