I checked the 264 schematics on Funet now, and they show that the 8501 has
7 processor port I/O lines, P0-P4 and P6-P7. P5 is not there! So pins 25
and 24 on the processor socket have the wrong connection in Ruud's schematic,
they should be connected to PA6 and PA7 of the VIA instead. It seems the
changes affect the serial port input lines and maybe the cassette WRT
line.
Nicolas
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