![]() ![]() This makes it awkward to use with the new controller boot disks designed for the old controller. The boot PROM of the Disk II was changed, however, so that instead of trying to read a boot sector written using the old format, it would instead load a boot sector written in the newer format. This made it possible for the controller to read FM, MFM, GCR-encoded data, but software designed for the earlier PROM would work as-is with the newer one. ![]() From what I understand, early versions of the Disk Controller II required that there never be two or more consecutive bit times without a phase transition (which would read as "0") but an upgrade to the "Woz machine" controller PROM made it possible to accommodate bit patterns that had two consecutive zeroes.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |