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Can I change the clock crystal in a PCjr to speed it up?

April 26, 2017clock crystal pcjr speed

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Can I change the clock crystal in a PCjr to speed it up?

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No. The PCjr uses the clock crystal for a lot of things. Changing it by even a few percent will leave you with a dead screen and a dead keyboard. However, you can use the PC-Sprint modification which is almost equivalent.