Commodore 1520 Plotter

Correct. I mentioned the Sharp CE150, which is what the PC2 printer/plotter is a rebandged version of. The PC2 family was closely related to the Shapr PC1500 machine, although I think the pritner/plotter was the only unit that was simply rebandged. The machine itself had a different keyboard layout (a right pain if you wanted to use keyboard overlays), and the RS232 interface was a Sahpe CE158 RS232/centronitcs interface without he centronics buffer PCB and connector. The I/O chip was still there though. I have both the Sharp and Radio Shack version, I modified the latter by fittend an 8-bit ADC converter on a bit of prototyping board, fitting it where the Centronics buffer should have gone and interfacing it through the unused lienson the I/O chip that would have been used for the Centronics port. Anyway, it does use the same pens. As does the Radio Shack CGP115, the printer that's built into one version of the Sharp MZ700 (I think that's the number, but the manual [1] is not to hand), the Oric printer, and several others. I think at least one digital 'scope (Gould?) used the same mechanism. [1] It's a nodd manual. It starts off telling you how to plug the machine in to the mains and your TV. Then ther's an introduction to BASIC with cartoon characters. So it's not a technical manual. But then you get full schematisc (of everything, including the printer and SMPSU), an introduction to machine code, memory maps and a commentes source of the monitor ROM. Hmmm... -tony