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Advanced/RH Technical Product Specification •• Page 8
LPX FORM FACTOR
The Advanced/RH motherboard is designed to fit into a standard LPX form factor chassis. Figure 2 illustrates the
mechanical form factor for the Advanced/RH. The Advanced/RH LPX form factor does adhere to the standard
LPX guidelines in that the outer dimensions are 13” x 9”. Location of the I/O connectors, riser slot, and mounting
holes are in strict compliance with the LPX specification. However, if business audio is selected by an OEM, a
slight modification to the OEM’s chassis may be necessary to accept the audio jacks on the motherboard.
OM04271
11.375
5.875
0.375
0.219
0.0
0.0
0.35 3.906 7.500
8.8125
13.0
9.0
Figure 2. Advanced/RH Motherboard dimensions
CPU
The Advanced/RH LPX motherboard is designed to operate with 3.3 volt Pentium processors. The 3.3 volt power
is provided by a patented on-board voltage regulator circuit. An on-board jumper enables use of VRE specified
processors. The voltage regulator provides the required voltage for the processor from the 5 volt output of a
standard power supply. Processors which run internally at 75, 90, 100, 120, 133, 150 and 166 MHz, and have
iCOMP
®
ratings of 615, 735, 815, 1000, 1110, 1176 and 1308 respectively are supported. Future Pentium
processors will also be supported.
The Pentium processor maintains full backward compatibility with the 8086, 80286, Intel386 and Intel486
processors. It supports both read and write burst mode bus cycles, and includes separate 8 KB on-chip code and
data write-back caches. Also integrated into the Pentium processor is an advanced numeric coprocessor which
significantly increases the speed of floating point operations, while maintaining backward compatibility with the
Intel486DX math coprocessor and complying to ANSI/IEEE standard 754-1985.