A p p e n d i x D

S p e c i f i c a t i o n s

CPU and Memory

CPU

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

System memory

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)

ROM

128KB (includes system BIOS and VGA

 

BIOS)

Shadow RAM

0 wait state access speed; automatically

 

copies both ROM BIOS and video ROM

 

into RAM

Cache controller

A38202SX (20MHz) standard

Cache RAM

32KB high-speed (25ns) static RAM

Math coprocessor 80387SX (20 MHz) support

(optional)

 

Clock/calendar

Real-time clock, calendar, and

 

114-byte CMOS RAM for configuration;

 

battery backup

Specifications D-1