From: Pete Rittwage (peter_at_rittwage.com)
Date: 2007-12-04 22:53:52
> Hi ! > > I would like to know more about weak bits. What are weak bits ? How can > they > be stored in the > GCR file format ? what would be necessary to support weak bits if you want > to emulate the r/w > head for drive emulation ? > As for how they are represented in the G64 format, it is a raw GCR stream, so it will have the bytes that the drive hardware saw at the time of imaging. In N2G (and now NIBTOOLS) I detect these areas and zero the bytes out. The emulator authors know what to do with these zeroed bytes (CCS, Hoxs) and return random (sort of) data to the emulated 15x1. WinVICE has support for it as a patch from me (and improved by Womo) but it is commented out in the source- you have to uncomment and recompile the updated rotation.c - Pete Rittwage C64 Preservation Project http://c64preservation.com Message was sent through the cbm-hackers mailing list
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