Hard Disk Drive; Multimedia Components; Cd-Rom; Sound Board - NEC PowerMate V486 Series Service Manual

1-18 Technical Information
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 VL
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.

MULTIMEDIA COMPONENTS

Multimedia components include the CD-ROM reader, sound board, speaker and micro-
phone. The following subsections give a brief description of each. Information on attaching
the speakers and microphone is located in Section 2, Setup and Operation.

CD-ROM

CD-ROM readers come pre-installed in the multimedia systems. Operation of the readers
are described in Section 2, Setup and Operation. The CD-ROM reader may be used to load
programs from a CD. The CD-ROM reader can also be used to play audio CDs. The CD-
ROM reader is assigned as drive E.

Sound Board

The sound board is the Creative Labs Sound Blaster™. The sound board is installed in the
ISA backboard. System settings for the sound board can be found in a sound board direc-
tory on the system's hard disk drive (multimedia systems only). For information on chang-
ing the sound board settings, see the SB 16-bit Multimedia Audio Card User's Guide that
comes with the computer. The following are the factory settings.
n
I/O address – 220h for the sound board
n
Interrupt request (IRQ) – IRQ7
n
Direct memory access (DMA) – DMA channel 5 (16-bit) and DMA channel 1 (8-
bit)
The sound board uses 16-bit DMA data transfer and has software addressable IRQs and
DMAs for versatility. External connectors accept speakers or headphones, a microphone,
stereo input, and a musical instrument digital interface (MIDI) or joystick attachment. The
speaker jack offers a four-watt (RMS)/channel amplifier. The joystick port allows a full
duplex MIDI.