NEC PowerMate V486 Series Service Manual

Also see for POWERMATE V486 - SERVICE: Manual

Contents

1-18 Technical InformationSpecifications for the diskette drives are provided in Appendix B, Specifications.HARD DISK DRIVEThe 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 VLbus 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-inchheight). See Section 3, Options, for installing an optional hard disk drive.MULTIMEDIA COMPONENTSMultimedia components include the CD-ROM reader, sound board, speaker and micro-phone. The following subsections give a brief description of each. Information on attachingthe speakers and microphone is located in Section 2, Setup and Operation.CD-ROMCD-ROM readers come pre-installed in the multimedia systems. Operation of the readersare described in Section 2, Setup and Operation. The CD-ROM reader may be used to loadprograms 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 BoardThe sound board is the Creative Labs Sound Blaster™. The sound board is installed in theISA 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 thatcomes with the computer. The following are the factory settings.n I/O address – 220h for the sound boardn Interrupt request (IRQ) – IRQ7n 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 andDMAs for versatility. External connectors accept speakers or headphones, a microphone,stereo input, and a musical instrument digital interface (MIDI) or joystick attachment. Thespeaker jack offers a four-watt (RMS)/channel amplifier. The joystick port allows a fullduplex MIDI.