I've got this 85C460 based VL-BUS motherboard that I'm not getting a clock signal at the ISA bus. I've traced it to the chipset, and there is nothing there either. There are two clock signals going into it, a 33MHZ, and a ~14MHz. All tests are made at the chip.
The datasheet for the chipset states that the divisor for the clock has to be set in a register. I don't have an original BIOS for it. Tried the SS diagnostic ROM, and a BIOS from a SIS 471. Two modes of thought:
1. Perhaps the BIOS has to put some value in here very early in the POST to get the ISA bus up. OR,
2. The chipset has a default value, and there is something else preventing it from outputting a clock signal.
Either way the correct BIOS would be much appreciated. I've hunted the net but can't find it anywhere.
The datasheet for the chipset states that the divisor for the clock has to be set in a register. I don't have an original BIOS for it. Tried the SS diagnostic ROM, and a BIOS from a SIS 471. Two modes of thought:
1. Perhaps the BIOS has to put some value in here very early in the POST to get the ISA bus up. OR,
2. The chipset has a default value, and there is something else preventing it from outputting a clock signal.
Either way the correct BIOS would be much appreciated. I've hunted the net but can't find it anywhere.
