3.5" floppy jumpers

[Pete Turnbull]

On 28/11/2008 14:13, Curtis H. Wilbar Jr. wrote:

> Mine has 6 jumpers, not a grid, and they are :
> H HO
> OP
> LHI
> HHI
> D1
> D0

Aha -- that first one is HHO.  It controls whether the drive outputs a 
density signal according to what its hole sensor detects.  LHI and HHI 
are are pair that you set according to whether you want to input an 
active-high or active-low density select from the controller (usually 
you don't).  OP is normally shorted on a PC, but I can't remember what 
exactly it does (something to do with disk changed, IIRC).

> On the Sony one, the bottom side has silscreened for one jumper S0/S1
> and the Other 3/3M.  So one is drive0/drive1, but what is the other ?

S0/S1 is the drive select (DS) or DS1).  I expect the other jumper set 
may be to do with the density, and whether it determines that from the 
holes in the disk ("Auto") or by a signal from the controller ("AT").

-- 

Pete						Peter Turnbull
						Network Manager
						University of York