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Prevent ROM paging if interrupt bits are set. #15

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Prevent ROM paging if interrupt bits are set. #15

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Commits on May 12, 2024

  1. Prevent ROM paging if interrupt bits are set. 

    According to recent investigations, the ULA will only change the
selected ROM if the four upper bits of &FE05, used for changing
interrupt-related state, are clear. This allows software to
conveniently clear interrupts without inadvertently changing the
selected ROM or needing to engage with the ROM selection logic.

See: https://stardot.org.uk/forums/viewtopic.php?t=27791
    @uiopaubo
    uiopaubo committed May 12, 2024
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