Many retro PCs were used with serial port mouse and don't have any PS/2 ports. Unfortunately most of the serial mice are broken or expensive today. Furthermore they were mechanical devices with a ...
Motherboard with AMI Legacy BIOS. Here I will use an ECS G31T-M, with 1MB ROM, using the Macronix MX25L4005 flash chip. Flash programmer (can be a Raspberry Pi). Unless you want to do the hot swapping ...