I have had some success refilling vintage plotter pens for the Casio, Sharp, and Radio Shack printer plotters. After quite a few trials and errors, I might have finally solved the refill challenge.

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The Casio PB-770 was quite an impressive model given the release date. With a multi-line display and memory expansion options, this model was certainly a competitor to the Sharp offerings of the time.

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The RS-232 interface for the Radio Shack PC-2 along with the CE-158 for the Sharp PC-1500 are difficult to find these days. These added possibilities to connect to printers, modems, save load programs faster and more. Luckily the CE-158X has been released.

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I recently acquired the PC-4 printer and cassette modules and wrote a version of my banner program for this model pocket computer. With only 544 bytes available, it was the most challenging version to code.

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