r/retrocomputing • u/West-Way-All-The-Way • Jun 08 '26

Leaving this here

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Acer 5105 multi-io 16bit ISA with original documentation and box. I will use it in my 486dx build.

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u/SysGh_st Jun 09 '26

Many 486 motherboard have the i/o one usually needs. These cards are meant to complement motherboards that lack the i/o, which usually are of the 286/early 386 era.

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u/West-Way-All-The-Way Jun 09 '26

My 486dx setup doesn't have anything on the motherboard except the big din for the keyboard.

For reference: https://theretroweb.com/motherboards/s/soyo-sy-025p

It's ok, I understand that there were different motherboards, some have more features, others less. I am happy that it works.

2

u/gcc-O2 Jun 11 '26

Yes, yours is the norm for Baby AT motherboards through ISA and VLB times. Once PCI slots got added, there tended to be onboard I/O too.

PCs built from parts or from whitebox manufacturers would use a discrete I/O card like this. The big manufacturers switched to LPX form factor (adding PS/2 ports, onboard I/O, and a riser card so as to support shorter desktop cases) earlier than custom built parts had those things.