Whatever it has been that caused such a thing to occur, it has been a long time since I enjoyed the assembly of a computer and so, referencing heavily from this place as a source have recently completed one that I in fact quite did.

As, below - much will not be new here, however included references are mostly general and may together, as a list of problems be of some use to any considering a similar project - a 486, more (or perhaps less) period correct.

Bill of Materials

FIC 486-GIO-VT2 (VLB/ISA)
486 DX4/100 &EW
2x 72pin 1Mbit x36 (4MB) SIMM
Cirrus Logic 5428 2MB
AWE64

Storage:
* IDE HDD
* SD > IDE Adapter

* 3.5 Floppy
* GoTek FDD emulator

ATX Case
* ATX Supply > AT Adapter with toggle power switch
* Nylon PCB Spacers/Standoffs

Input
- AT to PS2 Adapter >> PS2 to USB Adapter >> Cherry Keyboard
- Null Modem adapter/gender changer >> FTDI chipset USB to serial >> Raspberry Pi >> Any USB Mouse

for - 6.22.

A few points worthy of highlight.

Core Board/Components

A VLB/ISA board is a constraint, depending on perspective of the reader either interesting, or aggravating. I found a board having 72 pin FPM SIMM a positive, for availability but (at least by the manual) parity type may be a requirement, and a factor that could complicate, if sourcing RAM separately without being aware to take consideration to check.

* FIC 486-GIO-VT2 (VLB/ISA) - https://stason.org/TULARC/pc/motherboards/F/F … IO-VT2-129.html
* 486 DX(3) 100, which happened to be acquired with the board and therefore, inferring it supporting 3V, (486's generally being 5V) - lucking out with &EW Write back cache variant.

* Cirrus Logic 5428 2MB:
With ref to great comparison video by PhilsComputerLab - any Cirrus Logic 54xx seem to be easiest, good options
https://youtu.be/7Ha8Q_oLUr8?list=PL5T8bmLxd_ … MJ8MokDwSq&t=29

Though prevalent on *bay, I found it surprising how many different board layouts of each 54xx chip exist; (overloading the question, "what's the difference?"), so many, I've wondered if there were third party clones at the time.
In finding a 2MB card, a 1MB card wouldn't seem to compromise anything I'd require.

It's very long. By itself, a mounting bracket for the Baby AT board to ATX case.

ATX Case / Power
Using a new ATX power supply - of lowest wattage available, from a brand expressing enough confidence in its product to claim it made it.
ATX > AT power adapter, with a pre-connected toggle switch for power

AT/ATX dimensions, for case selection, guesstimated based on an infographic, and keeping the screw-standoffs that overlap the Baby AT mount points, & nylon standoffs that don't. The 'end' selection, isn't complete, yet;
https://en.wikipedia.org/wiki/ATX#/media/File … _Dimensions.svg

AWE64
Not as long, as the AWE32 I've once had; in practical terms is more available, if a little too 'new' for the era -from a certain perspective (i.e. the choice makes a contribution to your experience), it's not just better, it's also better in that respect, than modern sound cards.
https://www.youtube.com/watch?v=kXb3gNj--yo

Received, to find its outputs are RCA jacks, not 3.5mm -- back to the cable shop.

Storage:
* IDE HDD - in principle, most anything available should work, though capacity limits from the FIC board top out at ~2GB. (Here, an IBM Death(Desk)star, yet to live up to its reputation).
http://www.dewassoc.com/kbase/hard_drives/dri … mitations_2.htm

OnTrack Disk Manager - does make accessible more usable disk to the 486, but it's unnecessary and more importantly, hasn't read directly from a windows 10 system (for transferring files, by SD Card).
https://www.youtube.com/watch?v=sI7U9LYbt28

* IDE to Compact Flash - these exist/ are well understood;
* IDE to SD Card - an active adapter, may or may not exist, in supply with master/slave jumper (none I found) - effective as means of transfer data into the system, or primary IDE

* FDD emulator - The Gotek, well known on this site; info > https://www.youtube.com/watch?v=taFP1J_lZBI
- May yet undertake to reflash the FDD emulator -- https://www.youtube.com/watch?v=-K31S2xqZIk , https://github.com/keirf/FlashFloppy

Input

* KB: AT to PS2 >> PS2 to USB adapter
An understanding can be gained, that not all KB's will work through passive adapters (through 3 protocols, on principle - it probably should not). In this case, a Cherry is being used, without any issue and could almost be disappointing except that:
- this is less of a factor in difficulty, perhaps than acquiring a functional serial mouse.

Adapters of kinds do exist - but have to be supported by the mouse:
-> passive PS/2 to serial -- require that ps/2 mouse supports serial
-> passive usb to PS2 -- require that usb mouse support ps2, support serial; "unlikely"

3 approaches:
* a five times refurbished resale; no.

* active adapters
-> matze ps/2 to serial (a ps/2 mouse or usb+passive is still required) -- PS/2 to Microsoft Serialmouse Adapter Converter / Updated First Post / Firmware Update added ; a fantastic solution, but -
-> raspberry pi >> https://github.com/mborjesson/USB-Mouse-to-Serial

After acquisition of 3 adapters that will not work, here utilised is the Pi, as all parts have already have been present, and to use USB mice (even wireless ones) is, by an infinite margin, the technical best; it's also, as an adapter - faster than the computer to which it is attached.

Which seems somehow, Improbable.

Thanks!