DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Datamath Calculator Museum DCM-50A (TMS0900)
| Date of introduction: | September 21, 2022 | Display technology: | LED |
| New price: | $849.95 (2022 = $119.95 in 1972) | Display size: | 12 |
| Size: | 10.5" x 8.5" x 1.5" 267 x 216 x 38 mm3 |
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| Weight: | 17.4 ounces, 494 grams | Serial No: | 0001 |
| Batteries: | 4*AA | Date of manufacture: | mth 09 year 2022 |
| AC-Adapter: | DC 6V | Origin of manufacture: | USA |
| Precision: | Integrated circuits: | ZIF-Sockets for TMS0950, TMS0970, 3*SN75493, 2*SN75494 | |
| Memories: | Displays: | HP 5082-7653 | |
| Program steps: | Courtesy of: | Joerg Woerner |
The
Datamath Calculator Museum DCM-50A (TMS0900) is based on the generic
DCM-50A
Platform to access all features of calculators based on Texas Instruments
single-chip calculator circuits and covers designs based on:
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TMS0950 Family TMS0970 Family |
With many of the single-chip calculator circuits either designed for Texas Instruments' proprietary applications or developed for OEM manufacturers, available documentation of their features is rather scarce and we are committed to provide as much information as possible to the calculator enthusiasts and we document our observations and findings here.
The Technology Section of the Datamath Calculator Museum features under Calculator Chips "Datasheets" of the mentioned product families.
Characterization of Single-chip Calculator Circuits
The DCM-50A Platform supports the Characterization of 28-pin TMS0950 in its right-most TMS1000 Textool Test Socket using an additional TMS0900 Adapter and the voltages VSS set to 9.5V and VDD/VGG set to -5.5V, accordingly. The TMS0900 Adapter hosts an additional voltage regulator to provide VDD (-9V) to the TMS0950 Textool Socket. Additional means on the TMS0900 Adapter are translating the TMS0950 low-side switching digit drivers to DMC-50A compatible high-side switching digit drivers, generating the reference voltage for the TMS0950 and providing the external resistor and capacitor for the integrated clock oscillator.
Device-under-Test:
| TMS0952NL - TI-1250 (Work-In-Progress) TMS0954NL - TI-1260 (Work-In-Progress) |
The DCM-50A Platform supports the Characterization of 28-pin TMS0970 and TMC0900 Devices in its right-most TMS1000 Textool Test Socket using an additional TMS0900 Adapter and the voltages VSS set to 9.5V and VDD/VGG set to -5.5V, accordingly. The TMS0900 Adapter supports a maximum of 9 digit drivers but allows to jumper them to any set of the maximum of 11 digit drivers of the TMS0970 chip.
Device-under-Test:
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TMS0972NL ZA0348 ASP - TI-1200 (October 1976) TMS0972NL ZA0348 ASP - TI-1250 (August 1977) TMS0973NL BP - Bearcat BC 210 Radio Scanner (August 1977) TMS0974NL ZA0355 AP - TI-1270 (July 1976) TMS0975NL ZA0356 AP - Little Professor (September 1976) TMS0975NL ZA0356 BP - Little Professor (December 1976) TMS0975NL ZA0356 CSP - Little Professor (May 1978) TMS0975NL ZA0356 GCS - Little Professor (September 1978) TMC0907NL ZA0379 BSP - WIZ-A-TRON (June 1978) TMC0907NL ZA0379 DBS - WIZ-A-TRON (December 1978) |
Reverse-engineering of Single-chip Calculator Circuits
Work-In-Progress.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, September 21, 2022. No reprints without written permission.