NEC PowerMate V486 Series Service Manual

Also see for POWERMATE V486 - SERVICE: Manual

Contents

1-14 Technical InformationTable Section 1-11 Graphic ModesMode(Hex) ColorsColumn/Rows Buffer ResolutionVideoClock(MHz)HorizSync(kHz)VertSync(Hz)7C2 256 100 x 37 A0000 800 x 600 72.0 56.6 707E2,3 256 128 x 48 A0000 1024 x 768 80.0 48.1 8718x8 character size28x16 character size3InterlacedDual IDE PortsThe system board in the PowerMate V486 Series provides two IDE ports — a fast IDE port(the primary channel) and a standard IDE port (the secondary channel). Each port supportstwo devices for a total of four IDE devices. The system supports the installation of an IDECD-ROM reader for system configuration flexibility without the addition of a controller.The fast IDE port features an enhanced IDE interface which supports up to 10 MB per sec-ond 32-bit wide data transfers on the high-performance VESA local bus (VL bus). (Stan-dard IDE supports 2 MB to 3 MB per second on the ISA bus.) In hard disk configurations,the standard hard disk is connected to the fast IDE port for high performance.ISA/PCI-BUS BACKBOARDThe ISA/PCI-bus backboard plugs into two bus connectors on the system board. The back-board provides expansion slots for additional circuit boards. The backboards for the desk-top and minitower systems are described below.n desktop systems (four slots) – three 8-/16-bit ISA slots (two available), oneshared 32-bit PCI and 8-/16-bit ISA slotn minitower systems (five slots) – four 8-/16-bit ISA slots (two available),oneshared 32-bit PCI and 8-/16-bit ISA slot.ISA BusThe system board uses the ISA bus for transferring data between the processor and I/O pe-ripherals and expansion boards. The ISA bus supports 8- and 16-bit data transfers and typi-cally operates at 8.33 MHz. A connector is provided on the system board for attaching theISA/PCI-Bus backboard.