Right there are no dip switches but there are jumpers inside a panel on the bottom. Only one jumper was soldered shut so I desoldered it (based on "all open dip switches" as the normal operating mods). No change.
I unfortunately don't have a Linux machine for testing with pdd.sh, yet. On Sun, May 19, 2024, 8:21 AM <[email protected]> wrote: > 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 > Plass > *Sent:* Saturday, May 18, 2024 6:36 PM > *To:* [email protected] > *Subject:* [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.) >
