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Appendix D
Specifications
CPU and Memory
CPU
System memory
ROM
Shadow RAM
Cache controller
Cache RAM
Math coprocessor
(optional)
Clock/calendar
80386SX microprocessor, 20 MHz system
clock speed, 20 MHz or simulated 8 MHz
processor speed, selectable through
software or keyboard command
0 wait state memory access speed at
20
MHz
2MB
RAM standard; base memory of
640KB
Memory expandable using 256KB,
1MB,
or
4MB SIMMs
up
to 14MB
(maximum); SIMMs must be fast-page
mode, 80ns access speed (or faster)
128KB (includes system BIOS and VGA
BIOS)
0 wait state access speed; automatically
copies both ROM BIOS and video ROM
into RAM
A38202SX (20MHz) standard
32KB high-speed (25ns) static RAM
80387SX (20
MHz) support
Real-time clock, calendar, and
114-byte
CMOS
RAM for configuration;
battery backup
Specifications D-1