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Thread: PS2 Model 25-004 Questions

  1. #41
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    Hmm, you know I could check the disk change switch. The drive I has however that is edge connector, WILL read and write high density 1.44MB disks just fine on a model 25, and thus should work on the 30 also, they contain the same disk controller. While the tech ref manual was written before the machines were released, it's clear to say we have proven it time and time again, that they CAN read and write 1.44MB with the correct disks.

    The best drive I've found however is the pin header type PS/2 drive, it works first try and still works to this day (but could use a cleaning).

    See, I proved these older PS/2's can read and write 1.44MB disks just fine: https://www.youtube.com/watch?v=H4y0TPFV_qI

    With the right drive, they work great! Not only does the BIOS support it (and I have the earliest known BIOS ROM there is---maybe the only BIOS ROM known actually, my later PS/2 model 25-004 motherboard contains the same exact BIOS, bit for bit), but the disk controller can handle it, and works just as good as if it came with the drive, no mods.
    IBM PS/2 Model 25, NEC V30 8MHz, 640KB RAM, ATI VGA Wonder XL, 2GB SSD, Ethernet, DR DOS 6/GeOS, Xircom PE3 Ethernet

  2. #42

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    So, just ordered a Sony-made 1.44mb with card edge. The last drive I ordered came in broken.

    Hopefully this one will work, lol.
    Current Vintage Equipment:
    IBM Thinkpad 390, IBM Aptiva A12, IBM PS/2 Model 25-004. Compaq Contura 4/25C.
    Asus P5A-B Socket 7 Box, Tandy 1000RLX-HD "B" & 1200-2FD, VIC20, Zenith ZFL-181-93, Packard Bell 300SX.
    Looking for: 286 Laptop, 386 Laptop, C64. Packard Bell Legend 20CD.

  3. #43
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    I have never successfully tested those drives in a 25. Hope it works for you.
    IBM PS/2 Model 25, NEC V30 8MHz, 640KB RAM, ATI VGA Wonder XL, 2GB SSD, Ethernet, DR DOS 6/GeOS, Xircom PE3 Ethernet

  4. #44

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    Quote Originally Posted by evildragon View Post
    I have never successfully tested those drives in a 25. Hope it works for you.
    Indeed, it works! I'm quite happy with it. Everything seems to be 100% working with it, as well. No problems detected so far.

    I have one of those preconceptions that Sony drives are better than others. Let's hope this one doesn't let me down

    This is the drive I puchased: eBay Link I removed the power converter board (not sure what machine uses that, but I have one now if anyone needs it), and the 5.25 bay sled.

    21586587_1688159107862138_6828792917865193940_o.jpg
    Current Vintage Equipment:
    IBM Thinkpad 390, IBM Aptiva A12, IBM PS/2 Model 25-004. Compaq Contura 4/25C.
    Asus P5A-B Socket 7 Box, Tandy 1000RLX-HD "B" & 1200-2FD, VIC20, Zenith ZFL-181-93, Packard Bell 300SX.
    Looking for: 286 Laptop, 386 Laptop, C64. Packard Bell Legend 20CD.

  5. #45

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    Interestingly enough, the drive numbers are different than I expected. I expected to use drive 0 in the middle cable position. It wouldn't work, and gave an Error (161 or 163, I don't remember). I put it at the end of the cable, and the error disappeared, but wouldn't boot from that configuration.

    I moved it back to the center cable position, and set the drive select to 1, and it worked flawlessly.

    I figured Drive 0 should be "A" and boot, but it seems I was wrong in my guess. Drive 0 seems to be "B" and wants to be in that position on the cable as well.
    Current Vintage Equipment:
    IBM Thinkpad 390, IBM Aptiva A12, IBM PS/2 Model 25-004. Compaq Contura 4/25C.
    Asus P5A-B Socket 7 Box, Tandy 1000RLX-HD "B" & 1200-2FD, VIC20, Zenith ZFL-181-93, Packard Bell 300SX.
    Looking for: 286 Laptop, 386 Laptop, C64. Packard Bell Legend 20CD.

  6. #46
    Join Date
    May 2007
    Location
    Oviedo Florida
    Posts
    1,525

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    Sweet, that's awesome. Does it read 1.44MB disks? I had that exact drive model and it would not read high density disks on a Model 25, only double density. Another drive however did just fine, but it was pin headered.
    IBM PS/2 Model 25, NEC V30 8MHz, 640KB RAM, ATI VGA Wonder XL, 2GB SSD, Ethernet, DR DOS 6/GeOS, Xircom PE3 Ethernet

  7. #47

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    Quote Originally Posted by evildragon View Post
    Sweet, that's awesome. Does it read 1.44MB disks? I had that exact drive model and it would not read high density disks on a Model 25, only double density. Another drive however did just fine, but it was pin headered.
    Reading 1.44 just fine. Didn't test writing. Can swap disks with no problems either.

    IMG_20170918_165534712_BURST000_COVER_TOP.jpg
    Current Vintage Equipment:
    IBM Thinkpad 390, IBM Aptiva A12, IBM PS/2 Model 25-004. Compaq Contura 4/25C.
    Asus P5A-B Socket 7 Box, Tandy 1000RLX-HD "B" & 1200-2FD, VIC20, Zenith ZFL-181-93, Packard Bell 300SX.
    Looking for: 286 Laptop, 386 Laptop, C64. Packard Bell Legend 20CD.

  8. #48
    Join Date
    May 2007
    Location
    Oviedo Florida
    Posts
    1,525

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    Awesome, glad to know!! Now we have verified proof, my drive was just simply faulty then. (I would rather my drive having been faulty, than it not having been incompatible).
    IBM PS/2 Model 25, NEC V30 8MHz, 640KB RAM, ATI VGA Wonder XL, 2GB SSD, Ethernet, DR DOS 6/GeOS, Xircom PE3 Ethernet

  9. #49
    Join Date
    May 2007
    Location
    Oviedo Florida
    Posts
    1,525

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    Why is your DOS prompt purple?
    IBM PS/2 Model 25, NEC V30 8MHz, 640KB RAM, ATI VGA Wonder XL, 2GB SSD, Ethernet, DR DOS 6/GeOS, Xircom PE3 Ethernet

  10. #50

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    Quote Originally Posted by evildragon View Post
    Why is your DOS prompt purple?
    That was my question in the OP :P

    Lastly, while the color screen is beautiful, and all the colors seem to show fine with the system test disk, the white text in DOS & Basic seems a bit 'purplish', any ideas if there's an adjustment?
    Current Vintage Equipment:
    IBM Thinkpad 390, IBM Aptiva A12, IBM PS/2 Model 25-004. Compaq Contura 4/25C.
    Asus P5A-B Socket 7 Box, Tandy 1000RLX-HD "B" & 1200-2FD, VIC20, Zenith ZFL-181-93, Packard Bell 300SX.
    Looking for: 286 Laptop, 386 Laptop, C64. Packard Bell Legend 20CD.

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