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An early electronic printing calculator. There is no display besides the printer and it doesn't print keypress digits until the entire number is entered.
The printer uses a form of electrographic printing requiring special paper. A rotating stylus scans across the paper delivering high-voltage pulses to burn pixels on the paper. A MOS character generator ROM like those used in CRT computer terminals of the day is used to generate the character pixel patterns.
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| 200464 | |
| 1971 (Integrated circuits stamped with 6927, 7031, 7126, etc.) | |
| 08 Dec 2000 | |
| Brownlee Office Equipment. | |
| Some neon lamps light up. No printer motor activity. |
| 02 Apr 2002 | |
| Cleaned. |
| 02 Apr 2002 | |
| Portion of reverse engineering done: power supply, printer, clock, memory, character generator. |
| 05 Apr 2002 | |
| Filmy gunk on PCB edge connectors cleaned off. Upon reassembly unit seems to function properly, as far as it is possible to test it in the absence of the special paper required. Digit lamps and motor function as would be expected and a scope indicates the pixel stream is present at the printer. |
| 05 May 2002 | |
| Reverse engineering complete. Unit is back to being stuck in print more (CC2 presumably). |
| 27 Dec 2004 | |
| Half-role of aluminized paper received. Unit mostly functional, addition and subtraction work. Multiplication results in overflow lamp coming on, although the correct result will accumulate into the accumulator. MSD seems to print as '4' when it should be '0'. |
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Canon Canola EP151
Calculators | Integrated Circuits | Displays | Simulations EEC |
bhilpert |
