DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Texas Instruments introduced the TMC0980 family of single-chip calculator circuits in June 1976 with the two scientific calculators SR-40/TI-30 and the counterpart Business Analyst for financial applications. Within two years Texas Instruments introduced with the TI-50, TI-53, and Business Analyst II calculators with a similar feature set in a much smaller housing and powered by two small button style alkaline batteries good for more than 1,000 hours of operation time. This tremendous progress was made possible by replacing the power-hungry LED Display with an LC-Display and switching the manufacturing process of the single-chip calculator circuit from a 9V metal gate PMOS process to a 3V metal gate CMOS process. The TP0320 family is based on the TMC0980 design, an extension of the TMS1000 Microcomputer family, but sports a larger data memory. The TP0320 chip includes 18,432 Bits Read-Only Memory (ROM, 2k*9 Bits) and 832 Bits Random-Access Memory (RAM, 12 Registers * 16 digits, 64 Bits Display), a 4-bit Arithmetic unit, a programmable PLA for segment decoding and both segment and digit multiplexing for a 9-digit LC-Display with up to 66 segments and 3 common scan lines.
The TP0310 chip developed at the same time as the TP0320 for the TI-1030 traces back to the TMC0920, while the next-generation TP0455 allows for a 12-digit LC-Display, timekeeping functionality with a 32.768 kHz crystal, and a 4-bit I/O bus for processor-to-processor communication inherited from the failed TP0485.
Due to a flexible design concept with both programmable ROM and segment decoder some design variations appeared.
| Type | Calculator/Product | Application | Comments |
| TP0320/CD3201 | Investment Analyst | Financial | ROM code CD3201 |
| TP0320/CD3202 | TI-30-II, TI-30 LCD, SR-40 LCD | Scientific | ROM code CD3202 |
| TP0321 | TI-50, Radio Shack EC-497 | Scientific | 2 Constant Memories |
| TP0322 | Business Analyst II, TI-44, BA-III, Radio Shack EC-5100 | Financial | Statistical Functions |
| TP0323 | TI-53 1st Gen., TI-53 2nd Gen. | Scientific | 32 Program Steps |
| TP0324 | TI-35 | Scientific | Statistical Functions |
| TP0325 | Business Card | Financial | Small housing, 28 keys |
| TP0326 | TI-20, TI-38 | Scientific | Conversion Functions |
| TP0327 | Sharp EL-503 | Scientific | 28 keys, Die-down Option |
| TP0328 | Jeppesen avstar 1st Gen., Jeppesen avstar 2nd Gen. | Flight Computer | Conversions and calculations |
| Description | Comments | |
| Architecture | Single-chip Calculator | Scientific, Financial |
| Category | Digit Processor | 4-bit digits |
| Related | TMC0980 | PMOS, 7-segment LED-Display |
| ROM Size | 18,432 Bits | 2048 Words * 9 Bits |
| RAM Size | 832 Bits | 12 Registers * 16 digits 64 Bits Display Register |
| Outputs | 3 Common, 22 Segments | Integrated Common Scan Line and Segment Drivers |
| Inputs | 5 Keyboard | Segment to Keyboard Scan-Matrix |
| Item | Min | Typ | Max | Unit | Comments |
| VDD | 3.0 | V | |||
| VSS | 0 | V | |||
| CK | 250 | 350 | 450 | kHz | Internal oscillator |
The TP0320 was manufactured in a 5 um metal gate CMOS process (metal width = 0.20 mil / 5.0 um, metal spacing = 0.25 mil / 6.0 um, diffusion width = 0.20 mil / 5.0 um, diffusion spacing = 0.20 mil / 5.0 um).
The die size of the TP0320 is approximately 220 mils * 220 mils / 5.6 mm * 5.6 mm.
The TP0320 uses either a 0.6” wide 28-pin DIP (Plastic Dual In-line Package with a 0.1” / 2.54 mm lead pitch)
or a 0.4” wide 28-pin SPDIP (Shrink Plastic Dual In-line Package with a 0.07” / 1.778 mm lead pitch).
TP0320 (Standard)
| Pin | IO | Function | Pin | IO | Function |
| 1 | n.c. | 28 | O | Segments FIN, SIGN, STAT | |
| 2 | O | LCD COM 1 | 27 | O | Segments E8, F8, E1 |
| 3 | O | LCD COM 2 | 26 | O | Segments D8, G8, A8 |
| 4 | O | LCD COM 3 | 25 | O | Segments DP8, C8, B8 |
| 5 | IO | Key row 6, D7, G7, A7 | 24 | IO | Key input 1, E7, F7, G1 |
| 6 | IO | Key row 5, E6, F6, F1 | 23 | O | Segments DP7, C7, B7 |
| 7 | IO | Key row 3, DP6, C6, B6 | 22 | IO | Key input 2, D6, G6, A6 |
| 8 | IO | Key row 4, D5, G5, A5 | 21 | O | Segments E5, F5, A1 |
| 9 | IO | Key row 1, E4, F4, B1 | 20 | IO | Key input 3, DP5, C5, B5 |
| 10 | IO | Key row 2, DP4, C4, B4 | 19 | IO | Key input 4, D4, G4, A4 |
| 11 | IO | Key row 7, D3, G3, A3 | 18 | O | Segments E3, F3, C1 |
| 12 | O | Segments E2, F2, D1 | 17 | IO | Key input 8, DP3, C3, B3 |
| 13 | O | Segments DP2, C2, B2 | 16 | O | Segments D2, G2, A2 |
| 14 | V | Key row 8, VDD | 15 | V | Negative Voltage VSS |
| Pin | IO | Function | Pin | IO | Function |
| 1 | O | Segments GRAD, SIGN, RAD | 28 | n.c. | |
| 2 | O | Segments E8, F8, E1 | 27 | O | LCD COM 1 |
| 3 | O | Segments D8, G8, A8 | 26 | O | LCD COM 2 |
| 4 | O | Segments DP8, C8, B8 | 25 | O | LCD COM 3 |
| 5 | IO | Key input 1, E7, F7, G1 | 24 | IO | Key row 6, D7, G7, A7 |
| 6 | I | Segments DP7, C7, B7 | 23 | IO | Key row 5, E6, F6, F1 |
| 7 | IO | Key input 2, D6, G6, A6 | 22 | IO | Key row 3, DP6, C6, B6 |
| 8 | O | Segments E5, F5, A1 | 21 | IO | Key row 4, D5, G5, A5 |
| 9 | IO | Key input 3, DP5, C5, B5 | 20 | IO | Key row 1, E4, F4, B1 |
| 10 | IO | Key input 4, D4, G4, A4 | 19 | IO | Key row 2, DP4, C4, B4 |
| 11 | O | Segments E3, F3, C1 | 18 | IO | Key row 7, D3, G3, A3 |
| 12 | IO | Key input 8, DP3, C3, B3 | 17 | O | Segments E2, F2, D1 |
| 13 | O | Segments D2, G2, A2 | 16 | O | Segments DP2, C2, B2 |
| 14 | V | Negative Voltage VSS | 15 | V | Key row 8, VDD |
| The Segment drivers A-G and DP (Decimal Point) are connected to the display in the pictured way. |  |
The keyboards of all calculators based on the TP0320 family consist of an x/y-matrix connected to up to seven segment outputs with the top row ([ON] key) connected to VDD and the keymatrix inputs K1, K2, K3, K4, and K8.
Example for the Business Analyst II with TP0322:
| K1 | K2 | K3 | K4 | K8 | |
| VDD | 2nd | DUE | FIX | OFF | ON |
| Row 7 | N | %I | PMT | PV | FV |
| Row 6 | x<>y | CST | SEL | MAR | K |
| Row 5 | SUM+ | % | X2 | 1/X | ÷ |
| Row 4 | STO | 7 | 8 | 0 | × |
| Row 3 | RCL | 4 | 5 | 6 | − |
| Row 2 | SUM | 1 | 2 | 3 | + |
| Row 1 | EXC | 0 | . | +/- | = |
Example for the Sharp EL-503 with TP0327:
| K1 | K2 | K3 | K4 | K8 | |
| VDD | OFF | ON | |||
| Row 7 | |||||
| Row 6 | EXP | SIN | COS | TAN | 2nd |
| Row 5 | ( | ) | ÷ | ||
| Row 4 | 7 | 8 | 9 | × | x<>M |
| Row 3 | 4 | 5 | 6 | − | RM |
| Row 2 | 1 | 2 | 3 | + | M+ |
| Row 1 | 0 | . | = |
Calculators based on the TP0320 make use of a 9-digit LCDs (Liquid-Crystal-Displays) with 3 COM (common scan) lines.
If you have additions to the above datasheet please email: joerg@datamath.org.
© Sean Riddle and Joerg Woerner, January 10, 2021. No reprints
without written permission.
