3.5" drives and tape drive in Unix PC

[Marty Donaldson]

>From article <9221 at stiatl.UUCP>, by bgi at stiatl.UUCP (Brad Isley):
> In article <22605 at pasteur.Berkeley.EDU> sjohn at cory.Berkeley.EDU (John Sasinowski) writes:
>>	I am interested in adding a 3.5" drive to my Unix PC to make
>>backing up the hard disk easier.  Jameco Electronics has a drive that
>>is listed as a 720K drive for an IBM PC.  Will this work in my machine?
>>If so, will it give me 800K on a disk?  The drive is manufactured by
>>Sony.
> 
> I waited a while for the correct response, but it didn't come.  Anyway, here's
> the sketchy requirements for making a 3.5" floppy work in the 3b1.  If it's
> configured for an IBM PeeCee it  WILL NOT WORK.  Sony's recent offerings in
> the 3.5" size are hardwired for PeeCee compatibility - no jumpers. :-(
> I know it won't work, I tried.  Gotta have jumpers.

I got that Sony drive from Jameco. Works great on my 7300, 4meg, 3.51m,
and two 20meg hd's. But you have to:

1). add a 34 contact IDC socket connector to the current floppy ribbon cable,
    this drive can not use the card-edge connector like the 5 1/4" drive.
    Jameco part # S34 for $.79 each or part # S34-18-S for $2.95, which is
    a cable  with S34's on each end.
2). There are no drive select jumpers, that is true. There IS a drive select
    switch (4 position). It's on one of the sides, don't remember which. The
    drive came with the switch set for "drive select 1" (pc type do-do). I
    just moved the switch to ds0, cabled up, created a desc. file in
    /usr/lib/iv and started to format flops.