It's happening again!
Got a new MOBO:

Zida 4DPS Ver 2.1 Tomatoboard (SiS 496/497) 486 PCI Motherboard
Very nice board, saw it and fell in love with it.

Plug it in....same exact symptoms as the other MOBO...so I'm starting to think that it is a Power Supply related problem.
Also I normally screw the motherboard into the case itself, is that a bad thing at all?
I'm going to try change Power Supply....this can't be happening!!!

I always test stuff on my test bench. This is just a LCD monitor box on a table 😀

Also I use a brand-new ATX power supply with an ATX to AT adapter. Much more reliable...

Yeah I'd check using another PSU. Back in the old days I threw out several nice 'bad' motherboards I'd love to have back now that I'm pretty sure it was the PSU to blame...

I have the exact same mobo but with another name - PCI400, I have no idea what they were trying to say. If you manage to run Am5x86-133 at 133Mhz, let me know! I could only make it work as 3x50Mhz or 3x33Mhz, when I set the board to 4x33Mhz (which is 2x default setting), it shows 3x33Mhz...

RacoonRider wrote:

I have the exact same mobo but with another name - PCI400, I have no idea what they were trying to say. If you manage to run Am5x86-133 at 133Mhz, let me know! I could only make it work as 3x50Mhz or 3x33Mhz, when I set the board to 4x33Mhz (which is 2x default setting), it shows 3x33Mhz...

As soon as I get an Am5x86 I'll test it. Probably around next week.

BTW guys, solved problem with MOBO. It was the PSU all the time. Damn!!!

I'm having some problems with the Mouse, the MOBO doesn't seem to recognise it. Tried in both COM1 and COM2. Tried different drivers....Logitech and CTMouse, nothing.

I know the mouse works, what else can I try? Maybe changing any setting in Bios?

BTW right next to the COM1 I see a GAMEPort, what's that about?

That has to be the parallel port.

Can't seem to make Serial Mouse work. In a near future I'll try a PS2 Mouse, I'm waiting for the 5 pin cable to arrive.
Strange....I posted a few pictures of the BIOS as the problem might be IRQ conflict or something similar:

Any help in appreciated. Sorry to be so insistent but, NO MOUSE, NO FUN...hehe. Can't do shit without it

Probably you've got the wrong type of serial port cable. There are two types.
Re: COM ports on a 486 PCI board

WOW! Didn't know cables weren't standard...guess I'm going to wait for the 5pin to PS2 port and see if it works.
thanx Markk

the the higher 1500uf won't dick with the circuit's operation as opposed to 1000uf cap?