Quote:
Originally Posted by Jack Spark
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Yes, thanks, that's the diagram I have. You'll note that it doesn't include a circuit diagram of the mouse, but that would appear to be due to all mice of that era having used a 'dumb' 4-wire interface for movement transmission.
Oh, wait, I've just noticed something interesting. There's no WR (write connection) between the Spectrum and the PIO. Surely that's impossible? Without it, the Spectrum won't be able to set up the data direction registers, won't be able to turn the port interrupts on, and certainly won't be able to send anything to the PIO-Connector. Must be an error?