ruud.baltissen_at_abp.nl
Date: 2006-09-04 07:57:33
Hallo Magnus,
> (Any of you guys have an idea what could have caused it?
Something can have decreased the ability to push or pull the line. This means that it takes more time before the voltage level of a line is that what you want. A good CIA will change the value within 100 nanoseconds but if a bad one needs several microseconds, you can imagine that the other side of the line already starts to read the value when it hasn't changed completely yet.
But such a thing can also happen at the input side: it takes some time to transfer the signal from the pin to the register that is read by the CPU. In this case the CPU simply reads the wrong value.
I hope this helps a bit.
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/ / |_/ Groetjes, Ruud
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