Home▸ Forums▸ 68kMLA▸ New Lisa! some questions about what to do with it — #25
Post #25 by sunder
Source Forum68kMLA
CategoryTroubleshooting
Post DateWed, 5 Dec 2007 - 11:20
Original URLhttps://68kmla.org/bb/threads/new-lisa-some-questions-about-what-to-do-with-it.10803/
Post
"Technical Explanation: The Lisa floppy disk controller (FDC) anticipates 5 bytes of "bit-slip-FF" to synchronize its state machine to an address mark or data mark. The Macintosh FDC was improved to need only 3 bytes of bit-slip-FF, however use of this improvement was only implemented in the Macintosh II ROM and later.
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This only applies to disk images restored to floppies via DART on certain Macintosh models. If the disks were restored with Disk Copy 4.2, they'll have the proper bit-slip.

The slowness is a symptom of not having an 800K I/O ROM. Experimenting with restoring either pin 20 or 9 might help.

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