It’s got a six phillips screws and two star screws with a pin RIGHT in the center of it; never seen this before, so my star bits didn’t work; I had to use a tiny flat head to open it, so haven’t looked at the back of the drive yet. I was on the hook for shipping and the item. I’ve still got a few NOS, but the last one I tried to sell, the guy’s check bounced and he vanished. If it works then I know unequivocally it’s the PS. Do they have some sort of inherent hardware problem?
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Though the system configured Mod 57 correctly with the ADF are you saying the controller could still be bad? I have Coleco ADAM and Commodore drives I can plug in and the power light stays on and the drive in use light goes out after a few seconds, but nothing on jbm new one. I received another today and bim workee! The cable is wired a bit differently for use with most “normal” controllers that have a DC37F external drive connector.
The system BIOS self test causes the floppy to light up and seek the head during bootup, it’s not built into the drive itself. I had a lot of trouble trying to get my 5.
Index of /parts/ibm/
I’ve written about it on my blog; a search should turn that up. I was on the hook for shipping and the item. I’ve yet to see one fail. If it works then I know unequivocally it’s the PS. They seem to be the ‘weakest’ component in my experience.
Does this sound logical? I’ve been servicing floppy drives for getting close to 40 years.
The drive in use light doesn’t blink or nothing. Will this controller work with the drives? Should the led stay on with power to it and then goes off after the PC is fired up? It’s got a six phillips screws and jbm star screws iibm a pin RIGHT in the center of it; never seen this before, so my star bits didn’t work; I had to use a tiny flat head to open it, so haven’t looked at the back of the drive yet.
I’ve used boxes ibmm most things floppy for a long time at least 20 years. I’d imagine the IBM external floppies are just like internal floppies connected via an external cable. It’s possible that the problem is not with the drives you’ve been getting, but rather the way that the jumper plugs on the drive are configured, or the cable that you are trying to connect them to the computer with. So the behavior should be just like an internal drive, 489.
Do they have some sort of inherent hardware problem?
Turned out in the end I was unlucky enough to have one bad drive and 3 bad cables. Someone had me do this to 44869 drive once before.
At least the other one I bought the led twinkled on and quickly off. If you hear the drive motor come on for a second or so when you latch the door, your power supply’s fine. I’ve got some NOS, universal floppy drive ribbon cables for sale if anybody needs one. During post the system detected it, I then formatted 1. Thank you for everyone’s comments!!!!
If he ever shows up on this forum again, I’m not going to let him forget it. I can’t tell if the drive has ever been opened.
Index of /parts/ibm/4869
The unit looks NEW. The seller said it was in his late fathers’ collection and was never used.
It’s also worth noting, that after a new cable my drive from worked like a dream once I’d set it up in BIOS. While that’s a great approach for most situations it’s kinda tough to apply that scenario to an external, proprietary floppy drive.
At this point there are too many possibilities. If the drive and cable work on the other computer, then your computer or disk controller, or power supply have a problem.