6 User's Manual
1.2 Form Factor
The HOT-559(S) main board is designed to fit into a standard ATX form factor
chassis. The ATX form factor does not adhere to the standard ATX guidelines in that
the outer dimensions are 305mm x 240mm. Location of the I/O connectors, riser
slot, and mounting holes are in strict compliance with the ATX specification.
1.3 Microprocessors
The HOT-559(S) main board is designed to operate with 3volt range Pentium/MMX
Processor and Cyrix 6x86/6x86L and AMD K5/K6 processors. An onboard switching
voltage regulator circuit provides the required 3 volts range from the 5.0 volt tap of
the power supply. Pentium/MMX processors that run internally at 75, 90, 100, 120,
133, 150, 166, 200 and 233 MHz are supported.
Cyrix 6x86/6x86L processors that run internally at P120+, P133+, P150+ and
P166+ are supported.
AMD K5 processors that run internally at PR75, PR90, PR120, PR100, PR133,
PR150, PR166, and K6 processor that run internally PR2-166, PR2-200, PR2-233
and PR2-266 are supported.
1.4 Memory
Second-level Cache
The Intel 82430VX Xcelerated Controller PCIset supports 512KB or 256KB second
level cache that uses the Synchronous Pipeline Burst SRAM. Pipeline Burst (PB)
SRAM provides performance similar to Synchronous Burst SRAMs for only a slight
cost premium over slower performing Asynchronous SRAMs.
Main System Memory
The HOT-559 mainboard provides four 72-pin SIMM sockets and one 168-pin
DIMM socket that make it possible to install up to 128MB of RAM. The SIMM socket
support 4MB, 8MB, 16MB, and 32MB 5V single- or double-side fast page or EDO
DRAM modules, and DIMM socket support 8MB, 16MB, 32MB, . ., 3.3V single- or
double-side SDRAM, fast page, or EDO modules.
Caution : The user should not populate both 5V SIMM modules & 3.3V DIMM
modules at the same time.
The four SIMM sockets are arranged in two banks of two sockets each, the DIMM
socket arranged in one bank provides a 64/72-bit wide data path.
Both SIMMs in a bank must be of the same memory size and type, although the
different types of memory may differ between banks. It is possible to have 70 ns fast
page DRAM in one bank and 60 ns EDO DRAM in the other.
