DATAMATH CALCULATOR MUSEUM
|
DATAMATH CALCULATOR MUSEUM |
With the introduction of the SR-51-II in 1976 the original 28-pin DIP (Dual Inline Package) encapsulation used for the TMC0501 Arithmetic Chip was changed to a 28-pin SDIP (Shrink Dual Inline Package) roughly the size of a standard 20-pin DIP encapsulation and the TMC0580 DSCOM (Double Scanning and Read-Only Memory) Chip more than doubled the capacity of the larger TMC0520/TMC0530 SCOM Chips from 1k*13 Bits to 2.5k*13 Bits in a 28-pin SDIP housing paving the way for the TI Programmable 59.
The TMC0580 DSCOM Chip integrates 2.5*13 Bits Instruction Memory with serial interface to the TMC0501E Enhanced Arithmetic Chip, 32 Constants mainly used for the calculation of transcendental functions with 16 digits, each accessible through a 4-bit bidirectional I/O bus and outputs for 16-digit display scanning. In addition to the 5 Registers of the TMC0501E Enhanced Arithmetic Chip labeled A, B, C, D, and E integrates the SCOM Chip two additional Registers with 16 digits capacity each, and named accordingly Register F and Register G. The DSCOM Chip not only doubled the number of additional Registers but increased them from two to eight.
While the design of the TMC0580 DSCOM Chip would allow the use of multiple devices in one product, were most designs implemented with two TMC0580 and additional TMC0560 BROM Chips to increase program memory to the maximum addressable capacity of 8k*13 Bits. Only the SR-60A Prompting Desktop Calculator makes use of three DSCOM Chips..
Communication between the TMC0501E Enhanced Arithmetic Chip and the other family members of the TMC0500 Building Blocks for Scientific and Programmable Calculators is realized with multiple means:
|
• IDLE, CLK 1 and CLK 2
Outputs are used to synchronize all peripherals connected to the TMC0501E
Enhanced Arithmetic Chip with the 16 States of its Instruction Cycle • EXT Output indicates that the TMC0501E Enhanced Arithmetic Chip is addressing external memories/registers • IRG Input to receive the 13-bit Instruction Words from the ROM of the TMC0580 • 4-bit bidirectional I/O Bus I/O 8, I/O 4, I/O 2, and I/O 1 to communicate with registers |
QUICK-LINK to TMS0500 Family.
| Type | Calculators | Function |
| TMC0581 | SR-51 II | DSCOM |
| TMC0582 | TI-58, TI-59 | DSCOM 1, with TMC0571 |
| TMC0583 | TI-58, TI-59 | DSCOM 2, with TMC0571 |
| TMC0584 | SR-60A | DSCOM 1 |
| TMC0585 | SR-60A | DSCOM 2 |
| TMC0586 | SR-60A | DSCOM 3 |
| TMC0587 | TI-5230 | DSCOM 1, with TMC0572 |
| TMC0588 | TI-5230 | DSCOM 2, with TMC0572 |
| TMC0580/CD2400 | TI-58C | DSCOM 1, with TMC0573 |
| TMC0580/CD2401 | TI-58C | DSCOM 2, with TMC0573 |
| Revision | Products | First Prototypes | Comments |
| TMC0581 | SR-51-C (SR-51 II) | Initial design | |
| TMC0581 Rev A | SR-51-C (SR-51 II) | May 1976 | 6 [:] 0 [=] [SUM] → {INV] [SUM] |
| TMC0581 Rev B | SR-51-C (SR-51 II) | August 1976 | |
| TMC0582 | SR-52 II (TI-59) | December 1976 | Initial design, DSCOM 1 |
| TMC0582 Rev A TMC0523 Rev A |
SR-52 II (TI-59) | January 1977 | Card protecting, etc. |
| TMC0582 Rev B TMC0523 Rev A |
SR-52 II (TI-59) | March 1977 | |
| TMC0583 | SR-52 II (TI-59) | December 1976 | Initial design, DSCOM 2 |
| TMC0583 Rev A TMC0523 Rev A |
SR-52 II (TI-59) | January 1977 | Card protecting, etc. |
| TMC0583 Rev B TMC0523 Rev A |
SR-52 II (TI-59) | March 1977 | |
| TMC0584 | SR-60A | May 1977 | Initial design, DSCOM 1 |
| TMC0584 Rev A TMC0523 Rev A |
SR-60A | July 1977 | Card protecting, etc. |
| TMC0585 | SR-60A | May 1977 | Initial design, DSCOM 2 |
| TMC0586 | SR-60A | May 1977 | Initial design, DSCOM 3 |
| 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 TMC0580 was manufactured in a 6 um metal gate PMOS process (metal width = 0.25 mil / 6.0 um, metal spacing = 0.30 mil / 8.0 um, diffusion width = 0.25 mil / 6.0 um, diffusion spacing = 0.30 mil / 8.0 um).
The die size of the TMC0580 is approximately 215 mils * 220 mils / 5.4 mm * 5.6 mm.
The TMC0580 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 (M-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 | √x | 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.
