Note, that I tested this Gotek drive with several usb sticks on the other working 520STFM and works fine. Seems to work, but accessing to the floppy does not. Replaced the FDD for a Gotek with FF 0.9.18a -> Same behavior. Tested the floppy on another 520STFM -> Worked like a charm Not even the typical "Drive is not responding" error. The floppy icon is displayed on TOS, however when you try to access to it, the floppy led blinks for 2-3 seconds.and then nothing happens. The problem in essence is the same: this computer came to me with non-working FDD.
I have EXACTLY the same problems as kokkiklhs stated, in an almost-identical hardware: a 1040STE and some noise on the RF image (which is noticeable by seeing some noisy vertical lines).
I'm so sad not to have found this thread before! I am no ST expert but here is the details of my recent ordeal replacing my floppy if this helps: I had similar problems that I tried everything to diagnose and ultimately I was able to replace the drive with a new $8 ebay floppy drive and all works fine now. the ST is a very sturdy and reliable machine. Sorry you have had such problems, I agree. I guess I will stop my efforts for now, but if I have any news in the future, I shall let you all know!! Thanks, man!!! I was planning to get a gotek USB floppy emulator flashed for ST, but since this problem appeared, I cannot be sure whether this could be really usable on this particular machine of mine, or not. Lotherek's (sp?) web store is also a great place. Exxox webstore is a good place to find parts that are tested. There is a FD sized unit that uses flash drives as the media, also Ultra-Satan Disk is my preferred go to solution. There are other solutions then a standard FD. but they are getting harder and harder to come by. But my experience with ST's is to replace FD with the EXACT same model as the failed unit. You obviously have much more EE knowledge than I. I've tried many, but met with little success. Mostly about using a HD FD in place of a 720K FD. There is a whole lot written here about FD in ST's. ST's are very reliable, if it has been kept in good condition it's whole life. So before trying to replace the capacitors, I ask for your opinions. And otherwise the machine seems to be working well. The only thing left for me to suspect is bad capacitors in the PSU (they SEEM to be good, though, and some DC measurements I already did seem to be OK), but it's not easy for me to find replacements here. Last but not least, I borrowed a good working SF314 from a friend and tried with its original mechanism, still the same results. Made further modifications to both 1.44 floppy drives for use with Amiga and tried them, they both worked perfectly with reading/formatting/writing/diskchange. Also tried to feed power to the floppy drives from an external ATX PSU. Checked the DC voltages on floppy power connector, they seem to be correct. Re-soldered all the capacitors inside the PSU. Re-soldered the bottom of the ribbon connection AND the FDC chip on the STE board, still the same. Removed and reseated all soceted ICs, after having cleaned the sockets with contact spray. Changed the original floppy ribbon cable with a new and longer one, exactly the same symptoms. Turned the little trimmer inside the PSU to the extreme right position, got a little improvement with picture quality but nothing else changed. Tried to format some disks (old and brand-new HD and DD disks), both drives refuse to format (step motor bangs 5-6 times, but ends with messages about drive not ready or write protected, no progress at all with the format bar of the GEM window). All exec files return with TOS Error #35, but I can read the contents of some non-exec files in ASCII form. I can open the disk directory, but ALL the folder names and filenames are corrupt (e.g. So what's the problem, I hear you say.īoth drives do not boot as expected, they just seem to read the disks for a couple of seconds, the machines turns to GEM afterwards. Had a couple of spare 1.44 floppy drives (Samsung SFD 321B and Mitsumi D359M3D) and made the modifications required for use with the ST and followed carefully the instructions of reversing the ribbon cable etc. so now, the drive is dead and unusable, beyond any repair! Opened it up and realized that the little ribbon that connects the upper head to the drive's main PCB was kind of cut, trying to fix it made it worse.
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I first managed to load a couple of Automation game disks that I wrote to real floppies using my PC and STDISK utility, but loading was not always successful. I recently acquired a 520STE, came to me working (with a little picture distortion on RF), but with an almost dead floppy drive! The drive is Newtronics (Mitsumi) D357T. Relatively noob with the ST range here, but very old and experienced with retrocomputing, in general.