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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
ROM
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
128KB system BIOS, video BIOS, and
SETUP code located in EPROM on main
system board
Specifications A-l