Epson Equity 486DX2/50 PLUS User Manual - Page 199
Appendix D-specifications, Cpu And Memory
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Appendix D Specifications CPU and Memory 32-bit CPU 25 MHz system: 80486SX processor, 50 MHz system: 80486DX2/50 processor System speed 25 MHz regardless of CPU; for 80486DX2/50, 50 MHz speed is internal only; 8 MHz speed is simulated by inserting wait states; high/low speed selection through software or keyboard command; 0 wait state memory access at high speed System memory 4MB RAM standard soldered onto the memory card; base memory of either 256KB, 512KB, or 640KB, selectable through jumpers; memory expandable using 256KB or 1MB SIMMs up to 16MB (maximum); SIMMs must be 80ns (or faster) access speed ROM 128KB (includes system and VGA BIOS) Shadow RAM 0 wait state access speed; automatically copies both ROM BIOS and video ROM into RAM Math coprocessor Standard for 50 MHz model; on 25 MHz model, 80486SX microprocessor can be replaced with optional 80487SX chip Clock/calendar Real-time clock, calendar, and 50-byte CMOS RAM; battery backup Cache controller 82385 (25 MHz) standard Specifications D-1