Appendix A

Specifications

CPU and Memory
32-bit CPU

4SX/25: Intel i486SX, 25 MHz

 

microprocessor; can be replaced with

 

optional 487SX/25 or ODP486-25

 

OverDrive processor

 

4DX/33: Intel i486DX, 33 MHz

 

microprocessor; can be replaced with

 

optional ODP486-33 OverDrive processor

 

4DX2/50: Intel i486DX2,50 MHz

 

microprocessor

System speed

High and low speeds available; high speed

 

is CPU-dependent (25 MHz, 33 MHz, or

 

50 MHz), low speed is simulated 8 MHz

 

speed; speed selection through keyboard

 

command; 0 wait state memory access at

 

high speed

Memory

4MB RAM standard on a SIMM;

 

expandable using lMB, 4MB, or 16MB

 

SIMMs to 32MB (maximum); SIMMs must

 

be 36-bit, fast-page mode type with 70ns

 

(or faster) access speed

ROM

128KB system BIOS, video BIOS, and

 

SETUP code located in EPROM on main

 

system board

Specifications A-l