Difference between revisions of "CRTC hardware differences"
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Latest revision as of 22:54, 6 November 2024
Hardware differences
There are several slightly different versions of the 6845. The BBC series require a 6845S varient as the VDU drivers depend on certain functionality:
- R3 Vertical Sync.
- R6 Vertical Displayed any odd/even value, to set to 25 in MODE 3,6,7.
- R8 Character Delay and Cursor Delay timing for MODE 7.
