Started by Starglider, 09:20, 17 October 16
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Quote from: JohnElliott on 23:00, 14 May 18I'd probably try to diagnose this by writing a program that mimics the normal lightpen read function and records what values were read from the lightpen as it does so.Thinking about this: If the counter starts ticking when the pen sees the electron beam, and stops ticking when the beam hits the right margin, then if the cursor's always on the right that means the PCW is only seeing small changes in the counter. That suggests the counter's only decreasing by small amounts. Maybe one of the bits isn't rolling over?
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