Epson 4000 - Manual (Page 116)

Appendix A
Specifications
CPU and Memory
32-bif CPU Intel 486SX/25, 486SX/33, 486DX/33,
486DX2/50, or 486DX2/66 microprocessor
System speed Fast and slow speeds available; fast is the
speed of the microprocessor, slow is
8 MHz; speed selection through keyboard
commands or jumper setting
Memory
ROM
4MB RAM standard on a SIMM;
expandable to 64MB using lMB, 2MB,
4MB, 8MB, 16MB, and 32MB SIMMs;
SIMMs must be tin-plated, 72-pin, 32-bit or
36-bit, fast-page mode type with access
speed of 80ns (with 1 wait state) or 70ns or
faster (with 0 wait state)
128KB system BIOS, video BIOS, and
SETUP code located in EPROM on main
system board
Video RAM 1MB DRAM on main system board;
expandable to 2MB using two ZIP chips
Shadow
RAM
Supports shadowing of system and video
BIOS ROM into RAM
C a c h e 8KB of internal cache; supports 64KB,
128KB, or 256KB of external cache using
28-pin, 8 x 8, 20ns DIP chips or 28-pin,
32 x 8, 20ns DIP chips
Specifications A-1