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Appendix A
Specifications
CPU and Memory
32-bit CPU
4SX/33: Intel
i486SX, 33
MHz
microprocessor; can be replaced with
optional 487SX/33 or ODP486-33
OverDrive processor
4DX2/50: Intel i486DX, 50 MHz
microprocessor
4DX2/66: Intel i486DX2,66 MHz
microprocessor
System speed
High, low, and automatic speeds available;
high speed is CPU-dependent (33, 50, or
66 MHz), low speed is simulated 8 MHz
speed, automatic speed switches from
high to low only for diskette drive access;
speed selection through SETUP, keyboard
command, or ESPEED program; 0 wait
state memory access at high speed
Memory
ROM
4MB RAM standard soldered on main
system board; expandable using 1MB,
4MB, 16MB, or 64MB SIMMs to 128MB
(maximum); SIMMs must be 36-bit,
fast-page mode type with 70 ns (or faster)
access speed
128KB ROM containing system BIOS and
video BIOS; 64KB ROM containing SETUP
code
Specifications A-l