Sharp PC-1245
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| The PC-1245's alphabetic keyboard, drawn in Sharp's instruction manual. No freely licensed photograph of a PC-1245 was found. | |
| Specifications | |
|---|---|
| Manufacturer | Sharp Corporation |
| Type | Pocket computer |
| CPU | 8-bit CMOS[1] |
| Memory | 2.2 KB RAM (1486 bytes for programs and data); 24 KB system ROM[1][2] |
| Storage | Microcassette, through the CE-125[1] |
| Display | 16-character LCD, 5 × 7 dot characters[1] |
| Sound | — |
| Power | Two CR2032 lithium cells, 6.0 V DC, 0.03 W[1] |
| Dimensions | 135 × 70 × 9.5 mm[1] |
| Weight | About 115 g with cells[1] |
| OS / Firmware | BASIC in ROM[1] |
The Sharp PC-1245 is a pocket computer made by Sharp Corporation, with a 16-character LCD, a 52-key keyboard, BASIC in 24 KB of ROM and 2.2 KB of RAM. It runs for about 300 hours on two CR2032 lithium cells and takes the CE-125 printer and microcassette recorder.[2][1] Sharp's English instruction manual for it is dated 1983.[3]
The PC-1245 has the same 24 KB ROM size, cells, power consumption, dimensions and weight as the Sharp PC-1251, but a 16-character display instead of 24 characters and 1486 bytes for programs and data instead of 3486.[1][4] Sharp Pocket Computers describes it as the first in the PC-124x/125x series and gives the processor as an SC61860 at 576 kHz.[5] Wikipedia's list of Tandy pocket computers, which draws on Ira Goldklang's TRS-80 site, includes no PC-1245; the TRS-80 PC-8 was the PC-1246.[6]
Specifications
[edit | edit source]| Item | Specification |
|---|---|
| Processor | 8-bit CMOS |
| System ROM | 24 KB |
| RAM | About 500 bytes system; 208 bytes fixed memory (A to Z, A$ to Z$); 1486 bytes program and data |
| Display | 16-character liquid crystal display, 5 × 7 dot characters |
| Keys | 52: alphabetic, numeric, special symbols and functions, numeric pad, user-defined keys |
| Memory protection | CMOS battery back-up |
| Power supply | 6.0 V DC, two CR-2032 lithium cells |
| Power consumption | 0.03 W; about 300 hours on the cells |
| Operating temperature | 0 to 40 °C |
| Dimensions | 135 × 70 × 9.5 mm |
| Weight | About 115 g with cells |
| Accessories | Hard cover, two lithium cells (fitted), keyboard template, instruction manual |
| Option | CE-125 printer and microcassette recorder |
A slide switch selects OFF and the RUN and PRO modes; the PC-1245 has no RSV mode. The machine switches itself off after about 11 minutes without a key press, except while a program is running, and returns to the same state when ON is pressed. A contrast control is on the right-hand side.[7][8]
Hardware
[edit | edit source]Sharp's instruction manual gives the PC-1245's capacities but not its circuit. The Sharp Pocket Computers archive holds service manuals for the PC-1246/1247, PC-1248 and PC-1250/1251, but none for the PC-1245.[5] No PC-1245 board drawing or parts list is available. The Sharp PC-1251 page describes the PC-1250/1251 board, a different model with the same ROM size, cells and case dimensions.
Documentation
[edit | edit source]- Sharp PC-1245 Instruction Manual (PDF): Sharp's 1983 English instruction manual, including the reset and cell replacement procedures, troubleshooting, maintenance, error messages and specifications.[3]
General maintenance
[edit | edit source]Cells, the two reset levels, contrast and cleaning are covered in Sharp PC-1245 General Maintenance.
Troubleshooting
[edit | edit source]Sharp's troubleshooting table and error codes are applied in Sharp PC-1245 Troubleshooting Guide.
Capacitor replacement
[edit | edit source]No capacitor values have been published for the PC-1245. See Sharp PC-1245 Capacitor Replacement Guide for what is known and how to record your own board.
Related pages
[edit | edit source]- Sharp PC-1245 General Maintenance
- Sharp PC-1245 Troubleshooting Guide
- Sharp PC-1245 Capacitor Replacement Guide
- Sharp PC-1245 Instruction Manual
- Sharp PC-1251
- Sharp PC-1500
References
[edit | edit source]- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 Sharp, PC-1245 instruction manual, appendix G "Specifications", printed page 157 (PDF page 159).
- ↑ 2.0 2.1 Sharp, PC-1245 instruction manual, chapter 2 "Introduction to the PC-1245", printed page 7 (PDF page 9): 52-character keyboard, 16-character display, BASIC in 24 KB ROM, 8-bit CMOS processor, 2.2 KB RAM, CE-125 option. Hosted as File:Sharp PC-1245 Instruction Manual.pdf.
- ↑ 3.0 3.1 Sharp, PC-1245 instruction manual, back cover (PDF page 212): "1983 © Sharp Corporation", printed in Japan, code TINSE3931CCZZ.
- ↑ Sharp, PC-1251 instruction manual, appendix G "Specifications", printed page 173 (PDF page 175). Hosted as File:Sharp PC-1251 Instruction Manual.pdf.
- ↑ 5.0 5.1 Sharp Pocket Computers, Printers, Cables, Level Converters & Accessories, sharppocketcomputers.com—link(accessed 2026-10-21) PC-1245 row: "First in the PC-124x/125x series", 1 × 16 display, SC61860 at 576 kHz, 2 × CR2032, PC-1245 Operation Manual; service manuals listed for the PC-1246/1247, PC-1248 and PC-1250/PC-1251.
- ↑ Tandy Pocket Computer, Wikipedia—link(accessed 2026-10-21) Models list: PC-1 Sharp PC-1211, PC-2 Sharp PC-1500, PC-3 Sharp PC-1251, PC-8 Sharp PC-1246; PC-4 to PC-7 were Casio designs.
- ↑ Sharp, PC-1245 instruction manual, chapter 3, printed page 17 (PDF page 19): RUN or PRO modes; auto power-off after about 11 minutes.
- ↑ Sharp, PC-1245 instruction manual, chapter 2, "Contrast control" and "Cell replacement", printed pages 13 to 14 (PDF pages 15 to 16): contrast control on the right of the computer.