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Michaelangel007 2016-01-26 11:33:18 -08:00
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#Apple ]\[ //e HGR Font 6502 Assembly Language Tutorial #Apple ]\[ //e HGR Font 6502 Assembly Language Tutorial
Revision: 41, Jan 26, 2016. Revision: 42, Jan 26, 2016.
# Table of Contents # Table of Contents
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330:E6 85 F6 60 330:E6 85 F6 60
## DrawString() # DrawString()
Now that we have the basic print char working lets extend it to print a C-style string (one that is zero terminated.) Now that we have the basic print char working lets extend it to print a C-style string (one that is zero terminated.)
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``` ```
## Copy text screen to HGR # Copy text screen to HGR
For our final trick we are going to copy the characters off the text screen onto the HGR screen. More magic? Nah, just bit-shuffling. For our final trick we are going to copy the characters off the text screen onto the HGR screen. More magic? Nah, just bit-shuffling.
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* Other non-7x8 fonts * Other non-7x8 fonts
## Conclusion # Conclusion
Hope this HGR font tutorial helped you understand the inner workings of a font blitter! Hope this HGR font tutorial helped you understand the inner workings of a font blitter!
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That's all folks! Now go write some cool font blitter code. That's all folks! Now go write some cool font blitter code.
## References # References
* https://en.wikibooks.org/wiki/6502_Assembly * https://en.wikibooks.org/wiki/6502_Assembly
* http://www.6502.org/tutorials/compare_instructions.html * http://www.6502.org/tutorials/compare_instructions.html
* http://www.6502.org/tutorials/6502opcodes.html * http://www.6502.org/tutorials/6502opcodes.html
* https://skilldrick.github.io/easy6502/ * https://skilldrick.github.io/easy6502/
## Misc. Utilities and Files # Misc. Utilities and Files
* Convert [font image to C array](image_2_c.html) * Convert [font image to C array](image_2_c.html)
* Convert [C array to binary font](c_2_fontbin.c) * Convert [C array to binary font](c_2_fontbin.c)