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Thread: IBM PS/2 Floppy converter development

  1. #11
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  2. #12
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    I've seen all of those before, unfortunately. This link: http://webpages.charter.net/zip4dos/PS2 may be helpful but I have been unable to find a mirror anywhere.

  3. #13
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    I've repaired all but one (it had mechanical damage) PS/2 floppy drives of different brands and types (small button, large button, HD, DD) just by replacing the electrolytic capacitors on the motor control board (bottom part of the drive). Swollen caps causing spindle motor to lost speed feedback and run fast. Head misalignment is rarely an issue on this drives (only one drive needed it in all my PS/2 computers) and even it has, it can be easily aligned by using ImageDisk software with adequate accuracy.

    Adapting a modern drive is electrically not that hard but mechanical adaptation is challenging particularly for big-button, thick drives. With that adapter with pull-ups, I've successfully tested modern Teac, Alps, Mitsumi, Samsung and Sony branded floppies in different PS/2 computers.

    Quote Originally Posted by steve314 View Post
    Hi all,

    A few months ago I purchased an IBM PS/2 model 50 for $20 CAD. The floppy drive didn't work, so I've been developing a PCB to connect a standard floppy drive to the computer. At the moment, it consists of an edge connector and floppy connector, as well as some pullup resistors and a power connector(output for the floppy drive, so I don't have to modify the power supply).

    It kind of works - when the computer boots, the floppy head moves back and forth, just like on the original drive. However, I get a floppy error and the system refuses to boot. Doing some research, I found one or two people saying that a floppy drive with jumpers is required. This is to change the logic level between CMOS and TTL(I'm not sure which one is the correct one for the PS/2 systems). Since the header requirement is rarely mentioned, I have a feeling a lot of drives work with both logic levels by default(but clearly mine don't!)

    If anyone has a floppy drive with headers they are willing to give away(or maybe sell), that would be great. I need to confirm the board works before I start designing a revision with logic level shifting built in. Eventually, I would like to sell the boards alongside a 3D printed floppy drive mount. (I am also designing an MCA card, but that's another project entirely.)

    I am also interested if anyone knows more about this. I was unable to find very much information on the specifics.
    IBM 5150 - IBM 5155 - IBM 5160 - IBM PS/2 Model-60 (8560-041) - IBM PS/2 Model 55 SX with 8503 - IBM PS/2 Model 35 - IBM PS/2 Model 80 (8580-X21, XGA2) - IBM PS/2 Model-30 (8530-021, IBM 8513) - IBM PS/2 Model-30/286 (8530-H31) - IBM PS/1 (2133-642) - IBM PS/1 (2155-593) - IBM PC 330 450DX2 (6571-KV1) - TANDY 1000 TL/2 - Turbo XT Clone - Wearnes Boldline (80286/16) - Hyundai SUPER386ST (386SX/25) - AST AdvantagePro! (486DX/33) - Olivetti PCS46/C (486DX2/50), - 386DX/40 System - AMD K6-2/400 System - Pentium PRO/200 System

  4. #14
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    Quote Originally Posted by steve314 View Post
    I've seen all of those before, unfortunately. This link: http://webpages.charter.net/zip4dos/PS2 may be helpful but I have been unable to find a mirror anywhere.
    I have a copy of that URL. Which files do you need?
    Code:
    -rw-r--r-- 1 root root   38377 Dec 29  2013 badpage.JPG
    -rw-r--r-- 1 root root  293197 Dec 29  2013 blowup.jpg
    -rw-r--r-- 1 root root   94457 Dec 29  2013 Fdpinout1.jpg
    -rw-r--r-- 1 root root    1866 Jan 25  2016 index.html
    -rw-r--r-- 1 root root     935 Dec 29  2013 Narration.txt
    -rw-r--r-- 1 root root    2000 Dec 29  2013 Notes.txt
    -rw-r--r-- 1 root root 2146042 Dec 29  2013 test1.jpg

  5. #15
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    Tor, perhaps one of the forum members would like to re-post the information on their own web servers. I see the charter.net site referenced on several other pages.

  6. #16
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    Norway/Japan
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    Yes, that would be good. I have a copy of http://webpages.charter.net/zip4dos (copied Jan. 2016) but I can't provide a mirror myself. Anyone wanting to put that on their mirror, please PM me. It's only about 9.6MB.
    I don't have the rest of the charter.net site, only the zip4dos part.

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