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I'm working on applying the same principles as the HDDLW to retrofit high-density support to old Acorn Archimedes systems, and while experimenting with drives in my junk drawer, I came across a variant of the Teac FD235HF that does not appear to be suitable for this modification: the FD235HF-4240 has a 10-pin (rather than 11-pin) connector to the motor board, and the motor controller's OSC1 and OSC2 pins are connected to a crystal on the motor board (Y61 in my example), rather than having OSC1 driven by a clock from the main IC.

Aside from the -4240 model suffix, the other distinguishing feature of this variant is an unusual blue-coloured external layer on the main PCB. Never seen that before.

While I'm here, I might as well also add that the Sony MP-F17W doesn't seem to take well to this modification either. Though it has a convenient 0-ohm resistor that makes it easy to interpose the motor clock, the motor has fewer slots than most others I've seen, and at half speed, you get visible torque pulsations (and some pretty horrible noises). No bueno.

TEAC FD-235HF C829

Multi-meter identifies R12 and S6 are the target parts on this version of the PCB

It looks like the drivespeed (from pc2amiga package on aminet)reports 145 rpm. I'm using the alternative TEACs, but HD doesn't seem to be working properly. I'm wondering if it's due to building the .jed on windows.

Working on a printed insulator strip...
Once test fitted, I'll send the TinkerCAD link and STL

I don't have a collection of Amiga software on floppy to test with.
So the first thing I've tried to do is format DD and HD disks

Format of DD disk was successful
Wrote 600KB .MOD files, read and played back correctly.

Format of HD disk, detects 1.76MB disk, not successful in completing format.

Detection:

Failure:

It fails on different cylinder numbers each time.. usually 0, 1, 2... but I've gotten as far as 31

Alternative Failure:

I've run the DriveSpeed program (like the other active read\write issue)
with DD disks it shows 600RPM Average
with HD disks it shows 300RPM Average

DriveSpeed utility location:
https://aminet.net/package/docs/hard/PCFloppy2Amiga

DriveSpeed Usage:
"DriveSpeed 0" where 0 is my track device number

I've also run AmigaTestKit v1.21 on the floppy drive:
DD Floppy Index pulses at 196ms
HD Floppy Index pulses at 399ms

AmigaTestKit utility location:
https://github.com/keirf/Amiga-Stuff/releases

The AmigaTestKit results seem to be as expected.
The DriveSpeed results are counter-intuitive (out by a factor of 2).

Makes me wonder about the validity of DriveSpeed as a test ?

Setup:
I'm using ATF16V8b and pre-compiled .JED file.
Programmed and verified on T56 (big brother of T48 & TL866, same software)

Drive hardware is second alternative TEAC model shown.

Computer, A2000 AOS 3.2.2, 68030, 128MB RAM

Further testing:
I figured I should verify my Amiga hardware and OS was able to format \ write \ read 1.76MB disks.
Set a v4.35 FF Gotek's FF.CFG for:
interface = amiga
pin34 = auto
Copied a blank EMPTY-HD.ADF file onto the USB stick with the FF.CFG file.
The Empty disk appeared on my desktop.
I formatted it successfully, then copied a 1.3MB .MOD file into Empty
Opened HippoPlayer, loaded and played the file direct from volume Empty.
Works great.
Suggesting that my Amiga, Paula, Gary, CIA, Floppy cable, etc. seem to be working fine in HD.

Can we please have the .JED file ?
I too am using an ATF16V8b device.
WinCupl can not use the .PLD file supplied to create a .JED
My T56 programmer in Windows will only accept a .JED file.

This would be greatly appreciated.

Thank You,

how can I use GAL instead of PAL