Epson Endeavor 468C - Manual (Page 159)

Appendix A
Specifications
CPU and Memory
32-bit CPU 4SX/25C: Intel i486SX, 25 MHz microprocessor in open
PGA-type CPU socket; can be upgraded with optional
487SX/25 math coprocessor or Intel ODP486-25
OverDrive processor
4DX/33C: Intel i486DX, 33 MHz microprocessor in
PGA-type CPU socket; can be upgraded with optional
Intel ODP486-33 OverDrive processor
4DX2/50C: Intel i486DX2, 50 MHz microprocessor in
PGA-type CPU socket
System speed High and low speeds available; high speed is
CPU-dependent (25 MHz, 33 MHz, or 50 MHz), low
speed is simulated 8 MHz speed; speed selection
through keyboard command or SETUP; 0 wait state
memory access at high speed
Memory 4MB RAM standard soldered on the system board;
expandable to 36MB (maximum) using 1 MB, 4MB. or
T6MB SIMMs: SlMMs must be 36-bit, 72-pin, fast-page
mode type with 70ns (or faster) access speed
ROM 128KB system BIOS, video BIOS, and SETUP code
located in EPROM on main system board
video RAM
Shadow RAM
512KB on main system board; expandable to 1 MB
Supports shadowing of system and video BIOS ROM
into RAM
Cache 8KB of internal cache (built into the microprocessor);
sockets for up to 256KB of SRAM external cache
(optional)
Math
coprocessor
On 486DX/33C. and 486DX2/50C systems, math
coprocessor built into the microprocessor; optional 487
upgrade available for 25 MHz system
Clock/ Real-time clock, calendar, and CMOS RAM socketed
calendar on main system board with built-in battery backup
Specifications A-1