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Is there any test software you can run on the MK14 that will test the components, ie Memory, Display and I/O chip.
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Not as such. Sounds like a job for you.
There is a method you can use to crudely 'manually' check the I/O ports of the 8154 just using the monitor, see this post and the several after it:
https://www.vintage-radio.net/forum/...&postcount=155
Slothie wrote a RAM tester program but I can't for the life of me remember where it is, Timbo is usually the best at digging up things like that.