DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Datamath Calculator Museum DCM-50A (TMS0800)
| 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 TMS0800, TMS0830, TMS0850, 3*SN75493, 2*SN75494 | |
| Memories: | Displays: | 12*HP 5082-7653 | |
| Program steps: | Courtesy of: | Joerg Woerner |
The
Datamath Calculator Museum DCM-50A (TMS0800) 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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TMS0800 Product Family TMS0830 Product Family TMS0850 Product 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 TMS0800 Devices in its middle TMS0800 Textool Test Socket with the voltages VSS set to 10.0V and VGG set to -5.8V, accordingly.
Device-under-Test:
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TMS0801NC - Canon LE-84 (July 1974) TMS0803NC - TI-2500-II (January 1975) TMC0805NC - Sinclair Scientific (June 1974) TMC0806NC - Exactra 19 (October 1974) TMS0807NC - Canon LE-85 (August 1974) |
The DCM-50A Platform supports the Characterization of TMS0830 Devices in its middle TMS0800 Textool Test Socket. While the TMS0830 is specified for operation at 9.0V for both VSS and VGG, did we operate a TMS0833 successfully with the voltages VSS set to 9.0V and VGG set to -3.5 respectively.
Device-under-Test:
| TMS0833NC - MBO Expert (October 1975) |
The DCM-50A Platform supports the Characterization of TMS0850 Devices in its middle TMS0800 Textool Test Socket with the voltages VSS set to 10.0V and VGG set to -5.8V, accordingly.
Device-under-Test:
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TMS0851NL - Sovrin Model 128 (May 1975) TMS0852NC - TI-150 (December 1974) TMS0855NC - Canon LD-80 (December 1974) |
Reverse-engineering of Single-chip Calculator Circuits
The DCM-50A Sidekick TMS0800 ROM Recorder attached to the DCM-50A (TMS0800) allows Recording of all TMS0800 Product Family Members including the TMS0830 and TMS0850.
The Recorded ROM Images of the various members of the TMS0800 Product Family are published as TXT-Files in the "ROM Content" sections of their respective "Data Sheets":
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TMS0800: TMS0801 (Canon
LE-84), TMS0803 (TI-2550-II), TMC0805 (Sinclair Scientific), TMC0806 (Exactra
19), TMS0807 (Canon LE-85) TMS0830: TMS0833 (MBO Expert) TMS0850: TMS0851 (Sovrin Model 128), TMS0852 (TI-150), TMS0855 (Canon LD-80) |
IMPORTANT NOTE: This information is provided as a service of the Datamath Calculator Museum to enthusiasts of early Texas Instruments calculators and please be aware that the Copyright of the Software transcribed in the ROM Images, the underlying algorithm or application might be owned by Texas Instruments or other third parties. The commercial use of the published Recorded ROM Images is strictly prohibited. In case of questions please contact us using the email address listed in the footer of this webpage.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, September 21, 2022. No reprints without written permission.