Epson Equity 486SX/25 PLUS Product Information Guide - Page 2

Computer Specifications CPU and Memory 32-bit CPU 25 MHz system: 804865X processor, 50 MHz system: 80486DX2/50 processor System speed 25MHz 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 memory board; base memory of 256KB, 512KB or 640KB selectable through jumpers. Memory expandable using 256KB or 1MB SIMMS, up to 16MB (maximum); SIMMs must be fast-page mode, 80ns access speed (or faster) ROM 128KB (includes system BIOS 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 Cache controller 82385 (25MHz) standard Cache RAM 32KB high-speed (25ns) static RAM; twoway set associative. Clock/calendar Real-time clock, calendar, and 50-byte CMOS RAM for configuration; battery backup EQUITY 486DX2/50 PLUS EQUITY 486SX/25 PLUS Controllers Diskette Supports up to two drives in any of four formats: 5%inch, highdensity, 1.2MB; 5%inch, double-density, 360KB; 3%inch, highdensity, 1.44MB; or 31h-inch, double-density, 720KB; also supports optional Epson tape drive; controller on main system board Hard disk Supports up to two half-height drives; embedded IDE controller; interface on main system board Interfaces Monitor VGA adapter with 1MB DRAM (video memory) built into main system board; supports up to 800 x 600 or 1024 x 768 pixels in 16-colors or up to 640 x 480 pixels in 256-colors; multi-frequency monitor required for resolutions over 640 X 480 15-pin, D-shell connector Serial RS-232C, programmable, asynchronous; 9-pin, D-shell connector Parallel Mouse port Standard &bit parallel, mono-directional; 25-pin, D-shell connector Mini DIN, 6-pin connector for PS/2 compatible mouse or other device Keyboard Mini DIN, 6-pin connector for PS/2 compatible keyboard Option slots Six standard input/output expansion slots (five 16-bit ISA compatible and one 8-bit ISA compatible); 8 MHz bus speed Power Supply Type Internal; operation controllable by the Setup program 200W, fan-cooled, automatic (worldwide) input voltage sensing Input ranges Maximum outputs 98 to 132 VAC and 195 to 264 VAC +5 VDC at 22 Amps, +12 VDC at 6.8 Amps -12 VDC at .50 Amps, -5 VDC at .50 Amps Mass Storage Bays Up to five drives maximum Internal drive bay Two half-height or one full-height drives Externally-accessible One third-height and two half-height drives drive bay or one third-height and one full-height drives Equity Series Computers 5/12/92 466DX2/50 & 486SX/25 PLUS-1