Epson EL 486UC - Manual (Page 115)

Appendix A
Specifications
CPU and Memory
32-bit CPU Intel 80486SX/25 microprocessor;
upgradable to 486SX/33, 486DX/33,
486DX2/50, or 486DX2/66
System speed Fast and slow speeds available; fast speed
is 25 MHz or the speed of your upgraded
microprocessor, slow speed is 8 MHz;
speed selection through SETUP program
and keyboard commands
Memory 4MB RAM standard on a SIMM;
expandable to 32MB using 1MB, 4MB,
8MB, and 16MB SIMMs; SIMMs must be
tin-plated, 72-pin, 36-bit, fast-page mode
type with 70ns or faster access speed
ROM 512KB system BIOS, video BIOS, and
SETUP code located in EPROM on main
system board
Video RAM 512KB DRAM on main system board;
expandable to 1MB using 70ns or 80ns
44256 DIP chips
Shadow
RAM Supports shadowing of system and video
BIOS ROM into RAM
Cache
8KB of internal cache (built into the
microprocessor); supports 32KB or 128KB
of external cache using 28-pin, 8 x 8,20ns
or 25ns DIP chips or 28-pin, 256 x 4,20ns
DIP chips
Specifications A-l