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Thanks for the suggestions. I ended up removing the socket, soldering in a new one, dropping in the DS1287 replacement I got from eBay, and it was fully working. An hour later, the hard drive died. Back to eBay I go.

I installed the DS1287 replacement - https://www.ebay.com/itm/256115671181 and the "illegal shutdown" error is gone, however, now it gets stuck at "testing extended memory". No beep codes, continual flashing cursor.

I found this - The CMOS battery on this motherboard is integrated inside Dallas DS1287 real time clock controller. It can be replaced following these instructions. Without a working battery, the computer will loose its BIOS settings during reset and it will be not possible to boot it correctly.

In the meantime, I'll watch the video you suggested.

I replaced a Dallas DS1287 with a Dallas DS14287. I though they were supposed to be equivalent. Do you think this would work? https://www.ebay.com/itm/256115671181

I recently picked up PC40-III. Initially the error was a battery failure / CMOS checksum error. In researching I discovered this was a common issue and the Dallas time clock needed to be replaced. So, I removed the Dallas chip, installed a socket, and replaced with a NOS Dallas chip. Now I...

Working now. Thank you.

I'm using a PTI-205 XT/AT 8 bit FDD Controller.

Thanks. I'm almost there. I have the Shugart setup as drive B. On boot, it lights up and the head moves as expected and then the light goes out. In IMD, the head clean process now does move the head as expected. When I try to format a disk, the head moves across the disk and back to stop...

I have not. I recently ordered a logic probe but have never used one. I removed the drive from its enclosure and I'm assuming you mean pin 41 on the ribbon connector. I have additional information that may shed new light on the issue, if not I can try to figure out how to probe pin 41. New...

Update - I now have the drive set up with a 37 pin to 50 pin adapter. The drive light is on and using the IMD program, the RPM test runs. When I use either IMD of 8FORMAT to format the disk, I get a write protect error. The 8" disks I am using are not notched, Additionally, with 8FORMAT I...

On the inside, Newtronics will be written on the sticker under Mitsumi and Model.

I think the Newtronics drives have the drive door handles and the Alps have the push tab.

Thank you. I don't see the picture?

I'm trying to restore a 1541 Newtronics drive to working order. At this point, the drive can list directories and load programs. It cannot format or write files to disks. The alignment program (WorldofJani) shows all correct tracks with 100% in the track column and -100% in the 1/2 track...

Found one.

I assume you sold out a long time ago ..... I'm looking for a MOS 901486-01

Ok, so before I drive myself nuts, any thoughts on what I'll need to actually connect the drive to the PC? The PC (5150) has an external DB37 female connector from the floppy controller The external 8" drive has an external 50 pin male ribbon cable connector (at least that's what I think it...

Thanks everyone. I was looking at a Thinker Toys 8" drive.

Could an external floppy drive designed for an S100 system with a 50 pin connector be made to work on an IBM PC?