Thank you for your reply.
I have both the BIOS chip and the keyboard controller, only after I photoshopped the image I noticed they are missing and didn't want to start over. The reason for that - I give each board a good scrub when I receive it, and usually remove all that is removable.
After studying some datasheets and comparing to other boards with the same SiS chipset, I managed to find out/guess the values for most of the missing parts, but there are still a few unknowns and I feel these are enough for the board to mis-behave:
- On the ATC-1425A there is a resistor (R68, missing/removed) that pulls up pin 126 (DIRTY/MA11/PREQ3#) of the SiS northbridge. On all my other SiS 496/497 boards, this pin only connects to one input of an 74F244 buffer, but on the A-trend it also connects to this pull-up resistor.
- C30 and C31, two capacitors that are used as snubbers (I guess?) between northbridge pin 31 (ACLK) and GND, respectively pin 81 (CPUCLK) and GND. They are unmarked on my other boards, and I'm guessing they are in the low pF range so I couldn't measure them anyway.
- A pair of resistors (R84, R85) that are part of the VRM, near the voltage selection jumpers. Without them, one of the settings becomes unavailable, but I still have two other choices (besides +5v) for the CPU voltage, and if I get the board working I could work out their values by trial and error / using some variable resistors in their place until I get the desired voltage.
Other missing parts are already found out / guessed or their values are not so critical. I'm slowly giving up hope that someone will provide the photos, this board seems to be not so common and I've already PM'ed three users on different forums but they either don't respond or don't visit the forums anymore, so if anyone has any suggestion regarding my missing values...
