ICOP Technology ICOP-602X User Manual page 42

3.3 Advanced Chipset CMOS Setup
VGA Frame Buffer Size
The STPC implements a single memory subsystem for both the system as
well as the frame buffer memory. In other words, the size of the DRAM
available to the system is reduced by the size of the DRAM allocated to the
frame buffer. The lower range of the DRAM, starting from the DRAM address
00h, is allocated to frame buffer. The rest of the memory is used by the
system.
ISACLK
Set the speed of the ISA bus here. The settings are tied to the speed of the
PCI bus. If the PCI bus operates at 33 MHz, a setting of PCICLK/4 (default)
would yield an ISA bus speed of approximately 8 MHz, the standard speed
of the ISA bus. While most devices operate at higher ISA bus speeds, try a
slower bus speed if your ISA device does not function properly.
Memory Hole
You can reserve this area of system memory for ISA adapter ROM. When
this area is reserved, it cannot be cached. The user information of
peripherals that need to use this area of system memory usually discusses
their memory requirements.
The memory hole can be configured as 1 MB (15-14MB), 2 MB (15-13MB), 4
MB (15-11MB), 8 MB (15-7MB) or disabled.
38 ICOP Embedded 386SX CPU ISA Half Size SBC User's Manual