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BlotterP
Anonymous File :-(, x)
>>262911
There really isn't much modification needed. I found an old HP plotter, a 7470A but any that uses a pen will do. Rolands are better but more costly.
I removed the left and right pen 'grabbing' arms and taped in a pen in each. Oddly it uses the presence of a pen to calibrate the carriage.
The hardest part was making a serial cable. These 30 year old HP plotters use 'Reverse HP Null Modem' and it took me days to find that and then a diagram.
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