There’s a manual available on the retro web site check the motherboards beep code list

Greywolf1 wrote on 2025-11-25, 06:34:

There’s a manual available on the retro web site check the motherboards beep code list

Tried this already. Conveniently the manual doesn't contain a post code directory.

I found 2 interesting bits of info could be worth looking into 1 is the watch dog timer and 2 the cmos battery (not a normal battery) cr 1225 won’t post with dead battery.

Greywolf1 wrote on 2025-11-25, 14:52:

I found 2 interesting bits of info could be worth looking into 1 is the watch dog timer and 2 the cmos battery (not a normal battery) cr 1225 won’t post with dead battery.

I've disabled the watch dog timer and I've metered the CMOS battery and it's still got over 3 volts. Still the 4 beeps remain D;

I’ve tried looking for different models of the same brand motherboard but haven’t found anything else that explains the beep codes.
The only beep code it mentions is the failed cmos battery. But it’s not 4 beeps

Greywolf1 wrote on 2025-11-27, 12:28:

I’ve tried looking for different models of the same brand motherboard but haven’t found anything else that explains the beep codes.
The only beep code it mentions is the failed cmos battery. But it’s not 4 beeps

I have realized this board probably came out of a military touchscreen unit produced by HMW Enterprises in the early 2000s and I believe it requires an LCD controller or some other peripheral component to function properly. A part of me also believes that maybe only LCD output functions for display during BIOS and setup and that CRT output might only work once configured. It's possible that the board works perfectly fine and I just can't see it working and that the weird 4 beeps code is for something completely separate of post.

I would suggest connecting the SBC's first serial port to a terminal (8N1 @ 9600).

Many SBC's have debugging facilities available from COM1 which is usually a standard RS-232 port. Beeps might indicate just an usually expected hardware condition not met (like LCD availability, lack of compatible keyboard, bad memory, etc.). Since it is a military SBC there is no way this feature would be left out for cost saving measures, as the military has deep pockets, and any manufacturer would like to keep them as a happy customer. I would give this serial connected terminal a try if you haven't already.

That Is something I have noticed during my searches is this range of boards were for industrial use there are websites in Italian and polish that have information but could not tell you if it’s the information you’re looking for.

igully wrote on 2025-11-27, 22:38:

I would suggest connecting the SBC's first serial port to a terminal (8N1 @ 9600).

Many SBC's have debugging facilities available from COM1 which is usually a standard RS-232 port. Beeps might indicate just an usually expected hardware condition not met (like LCD availability, lack of compatible keyboard, bad memory, etc.). Since it is a military SBC there is no way this feature would be left out for cost saving measures, as the military has deep pockets, and any manufacturer would like to keep them as a happy customer. I would give this serial connected terminal a try if you haven't already.

Turns out I'm an absolute dolt and it was working the whole time. I still don't know what the 4 beeps is and it still does it but video just isn't getting properly output from the CRT connector. The 50pin LCD connector worked just fine though I just didn't do that before hand because I needed to find a compatible LCD controller for the board but I've got one and it's displaying properly. I didn't even connect a keyboard.

I wonder if the four beeps is just a POST success noise, like with those cheap Chinese boards from AliExpress.

Dan386DX wrote on 2025-12-07, 05:49:

I wonder if the four beeps is just a POST success noise, like with those cheap Chinese boards from AliExpress.

No, it seems the POST success is 1 beep once power is sent. The 4 beeps only seems then to happen once the power toggle is shorted after POST success. The device doesn't require that the power be toggled to turn on so maybe it has to do with it?