DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
The TMS1100 Microcomputer introduced in June 1976 doubled both the ROM Size and RAM Size of the original TMS1000 Microcomputer and kept all other parameters identical for an easy upgrade of existing designs. As of today we know only two Texas Instruments calculators using the TMS1100, the failed SR-40 Prototype and the short-lived TI-5050M. Nevertheless was the TMS1100 a success for Texas Instruments, powering everything from electronic games to microwave ovens and even the World's first Computer Radio Scanner used these chips.
| Type | Calculator | Application | Comments |
| TMS1111 | SR-40 | Scientific | Prototype |
| TMS1115 | TI-5050M | Small Printing | |
| TMS1116 | Regency ACT-T16K | Radio Scanner |
| Description | Comments | |
| Architecture | Single-chip Calculator | First Generation Digit Processor |
| Category | Digit Processor | 4-bit Digits |
| Related | TMS1000 Portfolio | |
| ROM Size | 16,384 Bits | 2,048 Words * 8 Bits |
| RAM Size | 512 Bits | 8 Registers * 16 Digits |
| Outputs | 11 Digits 8 Segments |
External Digit Drivers Internal Segment Drivers |
| Inputs | 4 Keyboard 0 Miscellaneous |
Digit to Keyboard Scan-Matrix |
The Datamath Calculator Museum DCM-50A (Platform) supports TMS1100 chips directly with the TMS1000 Textool Test Socket set to DCM-50A (TMS1000) mode. Both Characterization of TMS1100 Calculator Circuits and Reverse-engineering of TMS1100 Calculator Circuits is supported by the DCM-50A (TMS1000).
| Parameter | Min | Typ | Max | Unit | Comments |
| VSS | 0 | V | |||
| VDD | -14 | -15 | -17.5 | V | 15V Series |
| VDD | -7.5 | -9 | -10 | V | 9V Series |
| IDD | 4.5 | 10 | mA | 300 kHz, -15V | |
| VOUT | 0.3 | VDD | V | Output Voltage | |
| Ext. CK | 100 | 400 | kHz | Level between VSS and VDD | |
| Int. CK | 250 | 300 | 350 | kHz | Rext= 50k Ohm, Cext= 47 pF |
The original TMS1100 was manufactured in a 8 um metal gate PMOS process (metal width = 0.30 mil / 8.0 um, metal spacing = 0.35 mil / 9.0 um, diffusion width = 0.25 mil / 6.0 um, diffusion spacing = 0.35 mil / 9.0 um).
The TMS1100 is using in TI's calculator applications a standard 0.6” wide 28-pin DIP (Dual In-line Package with a 0.1” / 2.54 mm lead pitch).
| Pin | IO | Function | Pin | IO | Function |
| 1 | O | R8 Output | 28 | O | R7 Output |
| 2 | O | R9 Output | 27 | O | R6 Output |
| 3 | O | R10 Output | 26 | O | R5 Output |
| 4 | V | Negative Voltage VDD | 25 | O | R4 Output |
| 5 | I | K1 Input | 24 | O | R3 Output |
| 6 | I | K2 Input | 23 | O | R2 Output |
| 7 | I | K4 Input | 22 | O | R1 Output |
| 8 | I | K8 Input | 21 | O | R0 Output |
| 9 | I | INIT (Reset) | 20 | V | Common Voltage VSS |
| 10 | O | O7 Output | 19 | I | OSC2 (Ext. CLK = VSS) |
| 11 | O | O6 Output | 18 | I | OSC1 (Cext, Rext) or Ext |
| 12 | O | O5 Output | 17 | O | O0 Output |
| 13 | O | O4 Output | 16 | O | O1 Output |
| 14 | O | O3 Output | 15 | O | O2 Output |
If you have additions to the above datasheet please email: joerg@datamath.org.
© Joerg Woerner, December 3, 2023. No reprints
without written permission.
