Sorry, no PDF manual readily at hand.

But, since I'm here - I suppose you've already found this, with the bios dump?
https://www.ultimateretro.net/en/motherboards/6777#downloads

Random thoughts: Obvious OEM board. Not only because of the OEM name on it, but also weird shape, proprietary connectors for front panel. (White ones, center left, I'd assume)

That header left of the PSU connector looks like a floppy connector? Very OEM then.
One whole megabyte of RAM onboard already.

Not much else to jumper here? You could install a DX-40 by changing the oscillator crystal, but will it work at that speed?

If nothing comes up on its own here, you could try and contact some people who uploaded stuff like this:
https://wiki.preterhuman.net/File:Gs386-1.jpg
?

Good luck!

Have been experimenting tonight. I believe the four pin header at the front is for a lock, and disables the keyboard. It is definitely not a header for a speaker, haha.

I believe the BIOS wants me to run a setup program from DOS. I don't think I have any of those at the moment so I'm kind of stuck.

Ah yeah, ye olde keylock switch, some machines you needed a jumper across the middle pins, or an unlocked keyswitch, before they would boot.

The speaker was making weird ringing beeps while I had it plugged in there, but occasionally the machine would POST. It would make a more different beep if you pressed a keyboard key, and the key would not register.

I'm still wondering where the speaker header is. There's a three pin header in back, but it doesn't seem to send anything to the speaker. Also, perhaps I'm overlooking it but I don't see a battery anywhere on this board?

40MHz is a bad idea considering the chipset is stamped 20MHz and dated 88/89. I'd say 25MHz tops.

I believe that board is from a GS320.... unfortunately most all Goldstar stuff prior to 1995 disappeared.......

Tried the set-up programs I found here (Re: How to enter old Phoenix 386 BIOS?) and that seems to taken care of the 'invalid configuration' error message I was getting at boot, though the configuration being invalid seemingly was causing no problems with booting. Unfortunately, the machine does not seem to be detecting the 4 known-good sticks of RAM I have installed (each an identical 4MB 60ns parity stick) and is only making use of the 1MB onboard. When I use gsetup to tell it that there's extended memory there, it throws an error at boot. I don't have a lot of 30-pin SIMMs - all 4 of them I have are installed in this machine right now. Assuming this thing *is* out of a GS320, according to the brochures I have seen it probably doesn't know what to do with RAM sticks this size. I suppose I'll have to see if I can track down some 256K SIMMs.

That is good ! Too bad it needs a Setup Util to change BIOS settings...
I think you could get 1MB parity simms to work, you only need 2 to see if they work. Many older 286/386 boards do not like 4Mb simms, specially if the chipset/bios needs a setup util to configure it.
Can you take a good picture of the motherboard ?

Is that a shot at my photography skills? Haha.

Any details in particular on the board you're wanting to see better?

prokyonid wrote on 2022-03-15, 14:46:

Is that a shot at my photography skills? Haha.

Any details in particular on the board you're wanting to see better?

No not a bad photo but a lot of glare in middle part, I have similar issues and take my pictures in part of the kitchen as there is no overhead light (only side lights)...

Ah, yeah, you can't even see the jumpers there, now that I'm looking at it again. I'll get another one uploaded momentarily

EDIT: Not much better, should be able to make out all the markings on all the chips at least though - http://prokyonid.sdf.org/Goldstar386-2.jpg

Thanks ! Yes much better, can easily see all the detail. Now if only we could get any info on it 😀

I should have my 256K 30-pin SIMMs in the mail tomorrow, and after that I guess I'll start playing with jumpers and plugging switches and LEDs into random headers to see what they do. I'm pretty sure, from comparing the layout of the board against photos of same-era Goldstar machines, that the headers at the 'front' near the notch are for a reset switch & a turbo switch (2 pin headers), a keylock (4 pin header), and some indicator lights (5 pin header?). I guess the three pin header at the back is *probably* for an external battery. Not at all sure on the jumpers though