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Update rom5_zeros.txt

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mgcaret 2017-03-17 09:06:30 -07:00 committed by GitHub
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notes/rom5_zeros.txt
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@ -27,3 +27,13 @@ FCC9 - 55 bytes
FE96 - 352 bytes - but reserve 65816 vectors
- Future ROM 5X accelerator enhancements
Other potential usable space:
Aux Bank
D249-D32B - 227 bytes
This is the ROM checksum diagnostic, and we currently patch around it
because it fails with the ROM 5X patches in place, for obvious reasons.
We could fix the checksum, or reclaim the space.
To patch around it in a reclaimable fashion, a the JSR instruction at
C53D and the following carry check and JSR must be patched out, easiest
by placing BRA C555 at C53D.