DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
With the TMC05xx building blocks Texas Instruments created a novel architecture for scalable scientific calculators. The architecture uses minimum a 2 chip design with the Arithmetic chip TMC0501E and the SCOM (Scanning Read Only Memory) but was expandable to a maximum of 8 SCOMs, additional RAM as program memory for programmable calculators, additional RAM for general purpose registers and even a chip driving a printer.
The TMC0582 Double Scanning Read Only Memory DSCOM contains 2.5k*13 instruction memory and 16*16 digits constants.
Additional functions of the TMC0582 include scanning of the display digit driver outputs and the keyboard.
| Type | Calculators | Function |
| TMC0581 | SR-51-II | DSCOM |
| TMC0582 | TI-58, TI-59, SR-60A | DSCOM 1, with TMC0571 |
| TMC0583 | TI-58, TI-59, SR-60A | DSCOM 2, with TMC0571 |
| TMC0584 | SR-60(A) | DSCOM |
| TMC0587 | TI-5230 | DSCOM 1, with BROM |
| TMC0588 | TI-5230 | DSCOM 1, with TMC0572 |
| TMC0580/CD2401 | TI-58C | DSCOM 1, with TMC0573 |
| TMC0580/CD2402 | TI-58C | DSCOM 2, with TMC0573 |
| Item | Min | Typ | Max | Unit | Comments |
| VSS | 0 | V | |||
| VDD | -10.5 | -10.0 | -9.5 | V | |
| VGG | -16.3 | -15.8 | -15.3 | V | |
| PHI1, PHI2 | 225 | 230 | kHz | Opposite phases |
The TMC0582 uses a 0.4” wide 28-pin SPDIP (Shrink Plastic Dual In-line Package with a 0.07” / 1.778 mm lead pitch).
| Pin | IO | Function | Pin | IO | Function |
| 1 | O | Digit driver 15 | 28 | O | Digit driver 14 |
| 2 | V | Negative Voltage VGG | 27 | O | Digit driver 13 (OVER) |
| 3 | V | Negative Voltage VDD | 26 | O | Digit driver 12 (E-MSD) |
| 4 | IO | SCOM Interface D0 | 25 | O | Digit driver 11 |
| 5 | IO | SCOM Interface D1 | 24 | O | Digit driver 10 |
| 6 | IO | SCOM Interface D2 | 23 | O | Digit driver 9 |
| 7 | IO | SCOM Interface D3 | 22 | O | Digit driver 8 |
| 8 | O | Instruction words | 21 | O | Digit driver 7 |
| 9 | I | Calculating status | 20 | O | Digit driver 6 |
| 10 | I | External access | 19 | O | Digit driver 5 |
| 11 | I | Clock Input 2 | 18 | O | Digit driver 4 |
| 12 | I | Clock Input 1 | 17 | O | Digit driver 3 (M-LSD) |
| 13 | V | Common Voltage | 16 | O | Digit driver 2 (E-MSD) |
| 14 | O | Digit driver 0 | 15 | O | Digit driver 1 (E-LSD) |
The keyboards of all calculators based on the TMC0501 Arithmetic chip consist of a x/y-matrix connected to the SCOM digit driver outputs and the TMC0501 keymatrix inputs,
Example for TI-58 and TI-59:
| KN | KO | KP | KQ | KR | KS | KT | |
| D0 | (?) | (?) | |||||
| D1 | A | B | C | D | E | ||
| D2 | 2ND | INV | lnX | CE | CLR | ||
| D3 | LRN | X#T | x2 | sqrX | 1/X | ||
| D4 | SST | STO | RCL | SUM | yX | ||
| D5 | BST | EE | ( | ) | : | ||
| D6 | GTO | 7 | 8 | 9 | * | ||
| D7 | SBR | 4 | 5 | TI58! | 6 | - | |
| D8 | RST | 1 | 2 | 3 | + | ||
| D9 | R/S | 0 | . | +/- | = | ||
| D10 | Card Sense | ||||||
| D11 | |||||||
| D12 | (?) | (?) | |||||
| D13 | |||||||
| D14 | |||||||
| D15 | (?) | (?) |
Comments: The TI-58 is identified by a diode between D7 - KR, the TI-59 detects the Card Sense switch between D10 - KR. The (?) nodes are used to detect PRINT, PAPER ADVANCE and TRACE on the PC-100A.
If you have additions to the above datasheet please email: joerg@datamath.org.
© Joerg Woerner, February 02, 2001. No reprints
without written permission.
