>However, 400KB Macintosh disks made on an early powermac did not work >in my 1984 Macintosh. I had to use a SE/030 and even these disks crash >the 1984 Macintosh if i try to format them. Early Macs used a slighty revised floppy disk interface (the IWM - Integrated Wozniak Machine) was used which was smarter at synchronizing with the data on a floppy disk than the discrete state machine on the Lisa I/O board. Starting with the Mac II, the floppy disk driver software utilized this characteristic in formatting disks. As a result, disks made on a Mac II or later may not be readable on a Lisa unless using MacWorks Plus II with the PFG (Programmable Frequency Generator) that goes on the I/O board. Later models had the SWIM (Super Wozniak Integrated Machine) and 1.4M drive which does not have the variable speed ability of the 400/800k drives. The controller chips modified the data rate to emulate writing to the lower density disks. Although this works really well, I can imagine that in some cases, this emulation may cause compatibility problems. Hence, to make "good" 400k disks for Lisa use, I suggest you use one of the following: - Lisa 2 - 128k/Original Mac - 512k Mac - Mac Plus - Mac SE without the superdrive upgrade I suspect that using a 400k drive instead of an 800k drive may help give maximum compatibility, but have not tested this. HTH, James James MacPhail "Think not of engineering as art, [EMAIL PROTECTED] but of art as engineering" Sigma Seven Systems Ltd. [EMAIL PROTECTED] <http://SigmaSevenSystems.com> -- LisaList is sponsored by <http://lowendmac.com/> and... Shop buy.com and save. <http://lowendmac.com/ad/buy.com.html> 123Inkjets.com <http://lowendmac.com/ad/123inkjets.html> Star Trek Movie Collection on Video CD - $32.97 Back to the Future Collection on Video CD - $15.97 EurekaMovies.com <http://lowendmac.com/ad/eureka.html> - - - - - LisaList info: <http://lowendmac.com/lists/lisa.html> Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/lisalist%40mail.maclaunch.com/> Using a Macintosh? Get free email and more at Applelinks! <http://www.applelinks.com>
