Headland: Make ROMCS Disable bit only affect E0000-EFFFF per the datasheet#6779
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Summary
Make the ROMCS Disable bit of CR4 only affect E0000-EFFFF per the HT18 datasheet.
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References
Provide links to datasheets or other documentation that helped you implement this pull request.
Headland HT18 datasheet: https://theretroweb.com/chip/documentation/ht18a-b-c-64512ff1a6398435658181.pdf
Headland HT21 datasheet: https://theretroweb.com/chip/documentation/ht21-64513049ae9d4734313407.pdf