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Atari/CBM plotter ink cartridges
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We manufacture a blaster's seismograph that uses an old ALPS plotter carriage, 4" Wide. This plotter prints data and ground vibration wave curves. Our source for these pens has dried up, Tandy RS# 126-1480. This little ball point pen is used in the Commodore 1520, the Atari 1020, Tandy CGP-115, Oric MCP40 etc...
It would be great to find a new source.
Thanks Steve Fisher