The jumper is indeed missing. If someone wants to install one, they will need a
very low profile switch. I got what I thought was pretty low profile, but it
was just slightly too tall. But I didn't care much that I couldn't put the
switch cover back on so I left it that way.
-------- Original message --------From: [email protected] Date: 5/19/24
8:20 AM (GMT-05:00) To: [email protected] Subject: Re: [M100] FB100 disk
communication error I seem to recall there was something different on the
FB100. Like the dip sw was missing so you have to jumper it out so it uses the
correct BAUD rate. Jef Birt From: M100 <[email protected]> On
Behalf Of David PlassSent: Saturday, May 18, 2024 6:36 PMTo:
[email protected]: [M100] FB100 disk communication error I recently
got a FB100 disk drive. I disassembled it to check the belt, which
seemed...okay... I didn't put it all back together (fool me once, shame on
you...) On my T102 with TS-DOS (in ROM), it recognized the drive. I put in a
disk (DSDD) and TS-DOS said "not-formatted", as expected. So I formatted, but
after crunching for a while it said "Communication error". I tried with another
DSDD disk that I formatted on my laptop and it had the same result. Since I
hadn't reassembled it completely, during the format, I could see the head
moving so I knew at least the signalling was working. Also, possibly
significantly, during the format it seemed that the upper pad arm (opposite the
read/write head) wasn't touching the disk. Is this normal? More background:
after the partial reassembly, I tried inserting a disk and it didn't slot in,
and I may have pushed a little too hard. Turns out somehow the upper pad arm
shaft was stuck under one of the metal tabs of the "disk holder assembly" so
there was no way for a disk to go in. After fixing its location, I was able to
easily insert a disk. Could the upper pad arm be misaligned, causing the
communication error? Or could it just be an old belt, causing timing issues on
the motor? Any additional debugging tips would be appreciated.
(https://archive.org/details/tandy-portable-disk-drive-service-manual-26-3808/page/n4/mode/1up
is my reference.)
