#1 386 single board computer. Designed for a passive backplane.
#2 controller board for a 3.5" floppy drive
#3 video card for #1. Don't separate them.
#4 looks like an ACER 486 board, but there is considerable battery damage. Remove that blue barrel at the top right and do some research about leaky batteries. if you want to go down that rabbit hole.

maybe this board: https://stason.org/TULARC/pc/motherboards/A/A … NC-486-VI9.html

As for that video card for the SBC... you will need a VGA cable for it as well. Pretty sure the blue header is where the vga breakout cable would hook up.

That video card is not necessarily needed for that SBC. You could use any old ISA video card, but that one is a nicer TSENG so might as well as long as you can get the vga output wired up properly.

It probably came in a very compact setup as the header on the SBC is just an extension of the ISA bus. The vga output probably hooked up to a separate punchout in the case and wouldn't have needed an extra expansion slot.

am i doing it right? And am i able to run this thing up when there is no 486 cpu on the main board? I have also normal vga card and hdd/fdd controller, i think..

Don't plug that 386 board into anything other than a passive backplane.

The first thing to do is to diagnose the 486 board for damage.

Ok, so 486 cpu is required. This socket has 168 pins, but there is a hole without pin contact. Is that means that i can use 486 cpu with 169 pins designed for "socket 1" ?

That motherboard looks like it was designed for 486 dx2 chips. Look for a dx2-66

1: Ok, there is only one seller that sells chips in decent price. Do you think that cpu marked on a attached picture will be ok?

2: Turning on at format pc requires connect two wires coming out from the at power suply. Am i right?

Yes, and yes.

The power supply should have a switch on the end.

THE WIRES ARE 120VAC LIVE! BE CAREFUL.

in my region - even a 240
: )

That 386 card is nice to have since it has 32K cache using 385 cache controller give nice boost to the 386DX. But that will not beat the 486 anyway but fun to play with.

Cheers,

This is your board I think
http://www.win3x.org/uh19/motherboard/show/4369

If you can turn it on, a bios dump would be appreciated 😀

Edit : I added your photo 😀

pentiumspeed wrote on 2020-09-29, 01:45:

That 386 card is nice to have since it has 32K cache using 385 cache controller give nice boost to the 386DX. But that will not beat the 486 anyway but fun to play with.

Cheers,

True, but no battery damage, so better chance that it will work.

Btw, my experience is that it is possible to run some SBCs in 'normal' motherboards so long as there's no CPU in the board, the voltages are all OK (could be an issue with all that corrosion) and all ISA slots are wired up fully. YMMV and don't blame me for burning down the house (or more likely: your boards and PSU) if you try it, but it might be an option. That said, biggest issue is power draw - good chance the board draws more than a regular motherboard can supply over ISA and this SBC doesn't seem to have any aux power possibilities.

In any event even if you do get the 386 SBC to work in the ISA slot of the 486 board, it is just doing that: using the ISA bus. You won't be able to use VLB or any of the onboard devices on the 486 board. I fully agree that the correct way to use that SBC is in an ISA backplane. You can find them online fairly cheaply, or - even cheaper, more educational and fun - make one yourself: http://www.alexandrugroza.ro/microelectronics … lane/index.html

Still waiting for 486. Meanwhile - can someone identify simm module with 3 chips? simm above on the picture has 1mb. Can i "mix" these ram modules in one memory bank?

no.

the bottom simm is a 1mb, but it's wired differently than the top. they need to be the same type of simm in the bank.

The three chip memory has two AAA4M204J chips. These are 1M * 4bit words memory chips, so together they make one megabyte.

So these sticks may work together, however you need four sticks to complete a 486 bank and also the other ram stick may have a 100NS timing whereas the other one seems to have just 70ns timing.

@luckybob
Really ? Huh well then I guess you're right ^^

it's not so much the timings, but that is a a HUGE factor, 3-chip and 9-chip simms are electrically different.