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Awwww, but that's half the fun! Is there an award for worst case to drop a screw in?

I believe these _should_ be the keyboard screws-- https://www.amazon.com/Stainless-Rolling-Plastic-Passivated-Phillips/dp/B00GDYC2IU/

From the Model II Tech Ref, page 13, the keyboard screws are 6-19 x 3/4", page 12 says 'four thread forming and two machine screws' page 139 (Parts list) shows 6-19 x 3/4" (6) and SFT 3-28 x 3/8" (2). Could swear they were all thread forming screws in the keyboard. Page 177 "Case Assembly Parts...

I'm not famillar with those 5-pin connectors either. Amazon's got something that claims to be a 5-pin to 4-pin adapter, but the 5 pin part looks similar to a CD-rom audio connector. https://www.amazon.com/ITROLLE-6-89inch-Connector-Converter-Extension/dp/B099ZFQ2W6/

Tossed the whole thing (DOS, Windows for Pen, pcmcia drivers) onto Internet Archive-- https://archive.org/details/t200_20240329 Looks to be pretty much a clean original install.

Looks like it's got a bent pin on the control port. My guess is it's standard MFM.

Might try ImageDisk and see if it can read anything. Pretty sure it can tell you if the RPM is in the ballpark.

I want to see it in a DIP package!

Mine still lives outside, but I've wondered if you could fit one in the modem slot. If I remember correctly, the modem slot has power on the internal card edge, then connects to the external system bus connector with a short cable.

Sorry, pics have occasionally been showing up as 's-I1600.jpg' for me lately. 2 for $9 https://www.amazon.com/PNGKNYOCN-10-Pin-Serial-Motherboard-Cable（0-3m）/dp/B0BGQCYZMM

These? https://www.amazon.com/uxcell-D-SUB-Ribbon-Connector-Adapter/dp/B00YM41COI 5 for $9

You've got 2x 1meg simms in bank 0, 286 motherboards typically either ignore the 384k in the Upper Memory Blocks or possibly uses it to 'shadow' the roms. You should be able to use 4x 44256 and 2x 41256 in the bank 1 dip sockets to give a total 2.176 meg (2048+512-384). It's either/or per bank...

Sounds like sticktion. With the drive unplugged on a flat smooth surface, give the whole drive a quick spin. The idea is to use the inertia of the disk platters to 'unstick' the heads from the platters. Just don't get carried away and have it fall off the table.

Eproms don't need battery backup. My guess is there's an sram somewhere to hold configuration settings that the battery backs up. A dead battery _shouldn't_ keep it from working, but I've seen it happen. I'd clip the battery off and temporarily feed the board 3.6v and see if it works like that.

Here's a coverless Kittyhawk I've got sitting on the shelf (It was dead before I opened it):

Maybe something like this: https://www.amazon.com/Fielect-Connector-Conductor-Electrical-Equipment/dp/B081N3P1ZY/ref=sr_1_2?crid=QI7G3WTM0R1L&keywords=2mm%2Bdupont%2B1x2%2Bmale%2Bfemale&qid=1706741967&sprefix=2mm%2Bdupont%2B1x2%2Bmale%2Bfemale%2Caps%2C81&sr=8-2&th=1 Couldn't find a...

Looking closer at the pic, that's a _weird_ pin spacing. Closer vertically than horizontally? 3.5" drives used 2.54mm spacing, 2.5" drives used 2mm spacing. I've never seen an IDC connector with mixed pitch.

I wonder if that's a 44pin 2.5" ide interface, but with the spacing of a 40pin 3.5" connector. I don't see a separate power connector.

I'm not familiar with that machine but 'internal processing error' sounds like either memory, cache, or thermal issues. I'd throw memtest ( https://www.memtest.org/archives ) at it for a while and see what it says. Memtest86+ V4.0 is supposed to work on 386 and up cpus. 4.2 and newer I believe...

I'm pretty sure my 5200 'just works' with an external display. I've used an old Dell 4:3 lcd monitor with it.