Power Supply; Diskette Drive; Hard Disk Drive; Keyboard - NEC POWERMATE 4100M Service Manual

Technical Information 1-17

POWER SUPPLY

The power supply is mounted inside the system unit. It supplies power to the system board,
option boards, diskette drives, hard disks, keyboard, and mouse. Two connectors connect
the power supply to the system board. A fan inside the power supply provides proper ven-
tilation for the system. The power supply in the desktop supplies 145W of power. The
minitower power supply provides 200W. Power requirements and specifications for both
power supplies are provided in Appendix C.

DISKETTE DRIVE

Up to two diskette drives are supported in the system. The drives are connected by a single
ribbon cable with two drive connectors. The system refers to the diskette drives as A and B.
Drive A is for the first drive, B is for a second optional diskette drive. The diskette drive
cable plugs directly into the system board. Typically both diskette drive are terminated. See
Section 3, Options, for installing an optional 5 1/4-inch diskette drive.
Specifications for the diskette drives are provided in Appendix B, Specifications.

HARD DISK DRIVE

The system provides IDE interface connectors on the system board. The system board sup-
ports up to two IDE devices on the standard connector and two IDE devices on the fast lo-
cal bus IDE connector. The system unit provides one storage slot for a 3 1/2-inch hard disk
(1-inch height), and one available storage slots for a optional 5 1/4-inch device (1.6-inch
height). See Section 3, Options, for installing an optional hard disk drive.
Specifications for the diskette drives are provided in Appendix B, Specifications.

KEYBOARD

The PS/2-style keyboard is standard equipment for the system. The keyboard provides a
numeric keypad, separate cursor control keys, and 12 function keys, capable of up to 48
functions. Status lamps on the keyboard indicate: Num (Numeric) Lock, Caps (Capital)
Lock, and Scroll Lock key status. The keyboard's six-pin connector is plugged into the rear
of the base unit. The PS/2-style keyboard connector pin assignments are given in Appen-
dix A, Connector Pin Assignments.