Epson EL 486UC - Manual (Page 112)

Appendix A
Specifications
CPU and Memory
32-bit CPU
System speed
Memory
ROM
Video RAM
Shadow RAM
Intel 486SW 25 microprocessor;
upgradable to 486SXJ 33,486DW 33,
486DX2/ 50, or 486DX2/ 66
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 keyboard
commands or jumper setting
To select slow speed, press Ctrl Alt -; to
select fast speed, press Ctrl Alt + (use the
-or + key on the numeric keypad)
4MB RAM standard on a SIMM;
expandable to 64MB using 4MB, SMB,
16MB, and 32MB SIMMs; SIMMs must
be tin-plated, 72-pin, 32-bit or 36-bit,
fast-page mode type with access speed
of 70ns or faster
128KB system BIOS, video BIOS, and
SETUP code located in EPROM on main
system board
512KB DRAM on main system board;
expandable to 1MB using 70ns or 80ns,
256 x 4 bit, 20-pin, DIP DRAM chips
Supports shadowing of system and video
BIOS ROM into RAM
Specifications A-1