Data General AViiON 5500 Series, Installing, Expanding, And Maintaining

Page: 158 / 192

System board and system bus options
A-2
014–002250–01
System board
Printed–circuit board with side panel mounting, contains:
D
One Motorola 88110 microprocessor
D
One Motorola 88410 cache and memory management unit (CMMU)
with 256 kilobytes cache RAM.
D
One NCR single–ended SCSI controller
D
One AMD 802.3 Ethernet LAN controller
D
Three asynchronous serial peripheral ports (RS-232-C)
D
One synchronous serial peripheral ports (RS-232-C; full-duplex)
D
One parallel printer port; Centronics LPT1 compatible
Main memory
D
Socket connectors for three banks of four Single In–Line Memory
Modules (SIMMs) –– (4–, 16–, or 32–megabyte)
D
ECC with single– and double–bit error detection, single–bit error
correction
Minimum: 32 megabytes
Maximum: 256 megabytes
SCSI bus
Maximum of five buses per system: one integrated on system board;
up to four on optional expansion I/O boards
D
Each controller supports seven devices maximum (internal or
external)
D
Asynchronous operation mode support (5 Mbytes/s maximum)
D
Synchronous operation mode support (5.5 Mbytes/s maximum)
D
Integrated NCR 53C710 Small Computer System Interface (SCSI)
controller
D
Single–ended interface by default
D
Maximum of five internal devices (four 3.5–inch half–height
device bays and one 5.25–inch half–height bay)
D
One or two optional expansion I/O boards, each adapter board
contains two controllers
D
Configurable single–ended or differential SCSI interface
D
Maximum of seven external devices per bus