Epson U11, U12 Module, Math, Clock, socket, calendar, OverDrive, coprocessor, math coprocessor, 33 MHz math coprocessor, separate battery backup

Math	486SX/25 card: socket for optional Intel
coprocessor	487SX, 25 MHz microprocessor chip with
	built-in math coprocessor; microprocessor
	chip cannot be installed if OverDrive
	module is installed in shared socket
	486DX/33 card: math coprocessor built
	into the 486DX microprocessor; additional
	socket for optional Weitek 4167,33 MHz
	math coprocessor
	486DX2/66 card: math coprocessor built
	into the 486DX2 microprocessor;
	additional socket for optional Weitek 4167,
	33 MHz math coprocessor
Clock/	Real-time clock, calendar, and CMOS
calendar	RAM socketed on main system board;
	separate battery backup
OverDrive	486SX/25 card: socket for optional Intel
Module	ODP486SX/25 OverDrive module to
	double internal clock speed (50 MHz);
	module cannot be installed if 487SX/25
	microprocessor chip is installed in shared
	socket
	486DX/33 card: socket for optional Intel
	ODP486DX/33 OverDrive module to
	double internal clock speed (66 MHz)
	486DX/66 card: socket for optional
	(future) Intel OverDrive module

Specifications A-3