Digital Equipment DEC 3000 Series Service Information page 163

• Three TURBOchannel option slots
The DEC 3000 Model 900S AXP systems provide interfaces to:
• Serial lines
• Ethernet
• Fast SCSI
• ISDN
• Audio in/out
• Battery backed-up TOY
• High-performance two- and three-dimensional graphics
subsystem
• FDDI
Addresses generated by DMA devices in the I/O system may be
translated by a scatter/gather map. The scatter/gather map can
map 32 KB pages. This translation is optional, enabled on a
device-by-device basis.
Serial Lines: The serial line interface supports the following
equipment:
Equipment
Keyboard
Mouse
Printer
Communication
port
Ethernet Interface: The Ethernet interface can connect to the
local area network (LAN) by using an attachment unit interface
(AUI, or thickwire) or 10BASE-T twisted-pair cable. The selection
(thickwire or twisted pair) is software controllable.
SCSI Interface: The SCSI interface consists of two separate
channels using two SCSI-2 controller chips (53CF94). These
controller chips connect to the TURBOchannel through an ASIC.
The ASIC buffers data to and from the SCSI controllers, providing
16-longword DMA bursts across the TURBOchannel for increased
bus efficiency.
ISDN and Audio In/Out: An AMD 79C30A controller chip
provides an ISDN interface and telephone-quality audio input
and output. Jacks and connectors in the front of the unit provide
connections for a microphone and headphones.
Connections
Connects to a 15-pin D-sub connector
Shares 15-pin D-sub connector with
keyboard
Connects to a 6-pin MMJ and is DEC-423
compliant
Connects to a 25-pin D-sub connector and
supports full modem control
System Configuration
8–3