Re: db-19 cables from older Mac 400K 3.5" drives

[buggie@musca.unm.edu (stephen e buggie)]

Followup Bugg-comments!

Jim Poore ----- he smoked the IWM chip by plugging a 400k oldest drive
into a IIc ------- I have heard of this, but have avaoided attaching the
400K oldest Mac drive into any II.

I do know that the Apple II is not harmed by the short Mac 400 _cable_ by
itself.

In the past week, I attached a short oldest Mac db-19 cable SUCCESSFULLY
to a platinum 3.5 800K drive, and it works good.

In the past week, I tried a cable from the slimline beige Mac 800k
no-eject-button drive, on a 5.25" drive ----- just spins, but no smoke or
damage.

The IDE-20 plug on the oldest db-19 Mac cable looks like it can be
reconfigured.

David Empson: One reader said you can explain why some oldest Mac db-19
cables work and others do not.   Please tell!

Lets make these cables compatible so that I can attach them to
Bugg-Drives.  (Have made about 40-45 Bugg-Drive enhanced Disk II drives so
far!)

Steve Buggie
200 College Rd.
Gallup NM 87301








stephen e buggie (buggie@argo.unm.edu) wrote:
:                DB-19 ROUND CABLES FROM OLDER MAC 400k SINGLE-SIDED DRIVES

:                THESE CABLES SOMETIMES WORK WITH A2; SOMETIMES NOT: WHY?




: 	Occasionally, I salvage an older Mac 400K single-sided external
: 3.5" disk drive at a flea market or yard sale.  This drive is TOTALLY
: INCOMPATIBLE with A2, and must not be connected to any Apple II.

: 	I salvage the chassis screws, the round pancake magnet (makes a
: great fridge-magnet), and the round db-19 cable.   The cable is short and
: has twin thumb-screws.

: 	I once did pin-out measurements on this short db-19 cable and
: found them to be the same as with Apple II db-19 cables.

: 	I've connected this short Mac db-19 cable to Apple Disk II drives.
: About half the time, the drive works perfectly.  Yet, with half the short
: cables, the drive does not work well.   WHY???   My _hunch_ is that
: possibly the male pins on the db-19 plug may be slightly thin, and some do
: not make good contact with the walls of the female db-19 socket.   

: 	Any ideas, anyone?????		Steve Buggie     buggie@unm.edu