Support text character set modifications #24
Merged
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Rewrite the text character rendering to use a character ROM format similar to original Apple II video ROMs so that original ROM data could be used more easily.
Add a couple registers to allow text character patterns to be changed on the fly.
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
This PR adds support for loading in new text character sets on the fly from an Apple II program. Changes to the character ROM are not persisted across power-cycles.
As part of this, I also refactored the way the internal character ROMs were handled so that they more closely match original Apple II character ROMs and it's possible to convert an original character ROM for use by the firmware using the included
dump_character_rom.pyscript.