Date: Wed, 31 Mar 93 08:28:26 CST From: hanscom@eid.anl.gov (roger hanscom) Subject: Floppy Drives Message-ID: <9303311428.AA11223@athens.eid.anl.gov> Hi -- In hope of fostering some sort of discussion about interchangeability of floppy disk technology, and to further my own immediate requirement to replace an 8" DSDD 1+ MB drive with a 3.5" DSHD drive (yes, I know that I will "waste" some of the capacity of the 3.5" drive, but I don't want to take on the task of rewriting the BIOS right now), can anyone correct/comment on the attached table of cabling conventions and perhaps clarify missing data?? 8" 5.25" 3.5" ---- ------ ----- DRVSEL1* 26 10 DRVSEL2* 28 12 DRVSEL3* 30 14(?) DRVSEL4* 32 side select 14 32 32 in use 16 WD* 38 22 22 GT43* (trk > 43) 6 W GATE* 40 24 24 step* 36 20 20 direction* 34 18 18 head load* 18 16 track 0 42 26 26 index 20 8 8 write prot* 44 28 28 ready* 22 Rd Data* 46 30 30 (* = active low) In particular, I am uncertain about how to handle 3.5" select and motor enable (cable positions 10, 12, 14, and 16), and how to convert the active low 8" select signals, that select one of four drives, to what is required for 3.5" drives. Thanks ---------------------------------------------------------------------- roger hanscom@athens.eid.anl.gov ------------------------------