Re: Disk ][ Drives not working

["Bill Garber" <willy46pa@comcast DOT net>]

"John B. Matthews" <nospam@nospam.com> wrote in message
news:nospam-412BD7.11523702072004@news-server-fe-02.columbus.rr.c
om...
: In article <6c6dnRaHjfvu63jdRVn-tw@comcast.com>,
:  "Bill Garber" <willy46pa@comcast DOT net> wrote:
:
: [...]
:
: > I too use DD disks in Disk II drives, no problem.
: > Recently I had plugged a Disk II onto the card in the
: > machine and got the first row of holes of the plug on
: > the second row of pins as such:
: >
: >   |===================|  Card edge
: >   |o o o o o o o o o o|  Row of pins
: >   |HHHHHHHHHHHHHHHHHHH|  Plug on Pins
: >   |HHHHHHHHHHHHHHHHHHH|  Plug not on pins
: >
: > After doing so and powering up and down again
: > my Disk II responded as does the drive that is
: > being described in this thread. It will seek
: > track zero, but do no more. I suspect that the
: > IC "ULN2003" is the culprit. I haven't had the
: > opportunity to mess with it yet, but when I do
: > I will post my results.
:
: This is an excellent picture of a well-known way to fry the
: analog card inside the drive. I seem to recall folks saying it
: blew the "read sense amplifier" chip, luridly recounting how it
: would smoke and be visibly burned afterward. Is that the
: "ULN2003" you mention?

I'm not sure if that is the "read sense amp", but
it is the chip most commonly known to go first when
plugging it in that way. I'll see if I can find the FAQ
and post the paragraph on that, or the link if it's too
much to post.  :o)  Maybe someone with more time could
help me out on this.  :o)

Bill @ GarberStreet Enterprizez };-)
Web Site - http://garberstreet.netfirms.com
Email - willy46pa @ comcast DOT net
Change DOT to a dot to contact me



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