FDHD internal registers — #3

Post #3 by onlyonemac

Source Forum	68kMLA
Category	Development
Post Date	Mon, 17 Aug 2015 - 07:56
Original URL	https://68kmla.org/bb/threads/fdhd-internal-registers.2527/

Post

I am not programming the SWIM chip. I am trying to be the floppy drive, with the SWIM chip programming my registers. Therefore I need documentation on what registers are in the floppy drive itself.

Guide to the Macintosh Family Hardware said:
The signals PH2 through PHO, from the SWIM, together with the signal SEL, from the VIA,
make up the state-control lines used by the disk interface to select registers in the floppy
disk drives. The signal PH3, from the SWIM, is used for writing data to the registers in the
floppy disk drives.