Converting a Sony MPF920 floppy drive
Looking at my old Sony floppy drive model MPF920 it looks like it can be converted for Amiga according this link http://jope.fi/drives/. After modding can I just connect it directly as a replacement for the internal floppy drive?
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oh thanks! I thought you still need some circuitry to convert it. That's good then as i have several spare floppy drives around. :)
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Note that these drives don't have a proper /READY signal. Thus, some games may refuse to work. |
Please note that a modded PC drive will technically work, but the eject button may not line up properly or at all.
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So I tried the mod with the Sony floppy drive i mentioned. It seems to work sometimes but most of the time it's having a hard time reading/booting my diskettes. I can hear it trying hard to read disks. My Amiga keeps popping "read/write" error. These diskettes work just fine with the original internal floppy drive.
Any ideas what could be? |
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To avoid this, you could also solder a wire accross the pins of the HD detection switch. If all that doesn't help your drive is misaligned. But try these simple things first. |
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In any case, use Amiga Test Kit to check the floppy drive signals and see whether they are as expected. |
When I done the mod I didn’t really transfer the DSO resistor to the DS1 but just soldered a jumper wire which basically shorted them. So i fix it by following what’s really in the instruction and that is swap the ds0 and ds1 by moving the resistor. It’s all working now! :)
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If your drive issues a correct READY signal, it's sufficient to set the DS1 jumper to have ONE external drive. For more drives, you need the daisy-chain id switching which is usually coupled with the latch circuit anyway. On the big boxes, there's a jumper DF1: on/off. If set to on, this activates the DF1 latch circuit which, for the big boxes, is part of the mainboard. |
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The external drive case's circuitry provides a ready pulse for drive type/presence identification. This shares the same pin (READY) on the bus, but it is used for a different thing. The pulse is usually provided by a 7438 NAND chip and there is a specific algorithm for pulsing SELECT and MOTOR to read the ID pulse [1]. Quote:
[1]http://amigadev.elowar.com/read/ADCD_2.1/Hardware_Manual_guide/node01AB.html [2]https://www.amigawiki.org/dnl/schematics/A2000_R6.pdf page 11 |
I remember ruining a perfectly functioning (brand new) PC drive back in the day trying to mod it. I'm sure I followed the guide exactly but the picture that was given was actually of the wrong drive so it all went horribly wrong!
There are some drives that are much simpler to mod (changes to jumpers) and so in future I will probably end up getting one of these lol. In fact, I have bought one just for this purpose but the mod is simpler on this drive on the motherboard :) ... not to mention I refurbished a rusty Amiga A500 floppy drive that I thought was going to the tip and ended up working perfectly fine with the rust removed! |
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Just finished my Amiga Drive Selector which should also work Gotek and floppy drives like the Sony MPF920.
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[EDIT] http://jope.fi/drives/ lists drives but NOT which would be casework friendly ;) I have a Teac FD-235F which doesnt like me and am wondering if the button would transfer to a modded Teac FD-235HG for example? |
Hardly any old drives have an eject button that can be swapped directly into a newer drive. Thankfully new buttons can be 3d printed for many popular mechanisms.
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