>Actually, Stuart is right that the MFS format can handle 800K >(double-sided) disks, but I think only very rarely would anyone want to >do it. I think the only reason anyone would need to would be if they >had installed an 800K drive into a 128K or a 512K machine without >upgrading the logic board, which is possible with later versions of the >800K drives. Larry Pina covers this in _Macintosh Repair and Upgrade >Secrets_, p. 192 (to avoid confusion note that "128K ROMs" came with >the Mac 512Ke and Mac Plus--the original Mac and the Mac 512K came with >64K ROMs): > >"Older models of the 800K drive won't boot unless 128K ROMs are >installed. Newer models boot fine with any version of the ROMs. You can >even install an 800K drive (part # 661-0345) in a 128K Mac and it'll >work fine. You'll have twice as much MFS disk storage as before, ..." > >There are some problems with this--the main one being you can't use an >external 400K drive with it (see Pina, pp. 193-194). > >But yes, Disk Copy 4.2 running on System 6.0.x can read/write/format >both 400K MFS and 800K HFS disks with no problem. I don't think it will >let you format an MFS disk as 800K, but it can read such a disk just >fine. To do that I think you need the above configuration. But I could >be wrong about that. I don't think it's a limitation of the system--I >think it's a limitation of the Disk Copy application. > >Eric > Thank you very much, Eric! Although for me, personally, it's purely theoretical, it may be of very practical use for others. I hoped you would give us this explanation. And the idea of a "bilingual" System 6 will please some of our listers ...:-)
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