Epson Progression U12 - Manual (Page 177)

Appendix A
Specifications
CPU and Memory
CPU (on card) 486SX/25 card: Intel 486SX, 25 MHz
microprocessor soldered on CPU card;
additional socket for optional Intel
ODP486SX/25 Over-Drive module to
double internal clock speed (50 MHz);
OverDrive module cannot be installed if
487SX/25 microprocessor chip is installed
in shared socket
486DX/33 card: Intel 486DX,33 MHz
microprocessor socketed on CPU card;
additional socket for optional Intel
ODP486DX/33 OverDrive module to
double internal clock speed (66 Mhz)
486DX2/66 card: Intel 486DX2,66 MHz
microprocessor socketed on CPU card;
additional socket for optional (future)
Intel OverDrive module
System speed High, low, and automatic speeds available;
high speed is CPU-dependent, low speed
is simulated 8 MHz speed, automatic
speed switches from high to low only for
diskette drive access; speed selection
through SETUP, keyboard command, or
ESPEED program; 0 wait state memory
access at high speed
Specifications
A-l