Appendix A

Specifications

CPU and Memory
32-bit CPUSystem speed

Memory

ROM

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

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

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

S p e c i f i c a t i o n s A - l