I have an all in one PC from the mid-90s (Compaq Presario 3020 - See below). Based on the riser and from what I can measure (9" x 13"), it looks like an LPX form factor motherboard/case.
I want to bring it back to life and just do very simple stuff with it, e.g. file server or a Classic Arcade Game emulator.
Therefore, it doesn't have to be too powerful or need much cooling.
Which motherboard form-factors will be able to fit and line up the I/O ports without looking too out of place?
Bonus points if you can suggest an actual motherboard + CPU that isn't too expensive (new or used is fine)!