I have found it:

http://www.epanorama.net/sff/Computer/Motherb … Motherboard.pdf

Some information that could be important:

This manual is suitable for two model: AH4T and AH4. The model AH4 is a low cost solution of AH4T
by removing the DX4 supported. Install DX4 CPU on AH4 system board may cause the CPU burned-out.

So i guess both boards are just the same, the differents are: AH4 doesnt have the voltage regulator onboard so it will do only 5 volt cpus.
AH4T comes with the VR so it can have support for lower voltages.. So i guess the bioses would be the same.