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Thread: Just picked up an IBM convertible w/ prototype screens

  1. #11
    Join Date
    Jan 2010
    New Zealand
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    Might just need a good clean.
    Thomas Byers (DRI)- "You'll have a million people using the A> [MS-DOS prompt] forever. You'll have five million using [nongraphic] menu systems such as Topview, Concurrent PC-DOS, Desq, and those types. But there'll be 50 to 100 million using the iconic-based interfaces."

  2. #12


    I don't think that using the wrong media in a floppy drive will "kill" the drive. It's more likely that the media that you used was just simply flaking due to old age, and it left residue on the heads.

    Clean it with a cleaning diskette and isopropyl alcohol. This happens to floppy drives all of the time.

  3. #13


    Ditto what the previous two posts stated.
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  4. #14


    Well, after all, I did hear no popping capacitors, so that's a good sign. This IBM 5140 was however new; it came completely unused from a warehouse, so the disk drives still had their plastic anti-dust diskettes, although the LCD is damaged; And the diskette I used that caused the drive to repeatedly whirr was read perfectly in many USB drives before. Then again, they have different mechanics from real, older drives... I'll try seeing how the cleaning will go.

    P.S.: I'm still willing to offer the LCD for parts if anyone wants to take a stab. Also will be more glad if I can be offered a fully working screen. It only has a very, teeny tiny bit of plastic chipped off from my attempts to disassemble it; quite a nice board inside there too! Capacitors look clean and fresh, which also confused me trying to trace out the problem.
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  5. #15


    Managed to scrounge some actual IBM 720k disks for free, still trying to source a power supply. If anyone has an extra, please PM me.

  6. #16


    I can send pictures, if that helps. :P
    It is a mistake to think you can solve any major problems just with potatoes.

  7. #17
    Join Date
    Jan 2007
    Pacific Northwest, USA
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    'scuse me?

    You're saying a floppy disk (of any density) in good physical condition will destroy a drive?

  8. #18


    Good news in that today I think I made a boot disk for the PC Convertible, with all of the PC Convertible programs on it. Very convoluted process to write it, but it's on a good 720k disk and tested in virtualbox. Of course, it will not actually let me run anything, as it detects if it is actually on a 5140, but the fact that it booted gives me hope that it worked correctly.

    Am still in need of a 5140 power adapter, if anyone has one or a link to a compatible one, that would be fantastic. It needs to be 15V, 2.7 amps, 5.5mm x 2.5 mm, center positive. If you have anything, PM me please.

  9. #19


    I now have a compatible power adapter and finally got to fire it up! It beeped on power on, both drives spun up, went into basic. Gives me a clock error on bootup but that's because it keeps forgetting the time when I unplug it as there is no CMOS. It turns out only one of my three screens works and it is easily the least useful of the lot. My backlit screen whines and shows random lines, my reflective one is leaky inside and only a few lines work. The one screen that does displays properly has some weird anomalies. There seems to be no reflective material behind the screen, you can see right through and look at the circuit boards. As such, I need a very direct, bright light to see it at all. As such, I'm now looking for a backlit screen to purchase. Here are some photos of what I have so far.

    backlit broken:

    reflective broken:

    non-reflective working:

    the circuits visible on the non-reflective:

    Anyone know anything about why this screen would be like this? I know the last owner said there was one or two prototype screens, does this provide any evidence one way or the other? There is a serial number on the inside of the screen (backwards) that reads (to the best of my ability): "EPSON LD-BU8953J-5", then a line break, then "JAPAN ..... 622N"


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