Vax 613 0S Instruction Manual Page 34

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JUNKIO Interface:
An interface called the JUNKIO subsystem, which is connected to the
TURBOchannel. The IOCTL ASIC implements this interface. Chapter 7
describes IOCTL ASIC control of the subsystem and Section 9.5 discusses
programming the subsystem, which provides:
A nonvolatile time-of-year clock based on the Dallas Semiconductor DS
1287A Real-Time Clock (RTC)
Four serial lines, through two Zilog SCC (Z85C30) dual UARTS (universal
asynchronous receiver/transmitters)—SCC0 and SCC1
* Asynchronous for keyboard
* Asynchronous for mouse
* Asynchronous for the printer, via 6-pin MMJ
* CCITT V.24/V.28 19.2 KB/s asynchronous/synchronous 25-pin plug for
communications
An ISDN-S interface, via an AMD 79C30A (Revision E) chip.
Voice-quality audio I/O via the same AMD 79C30A (Revision E) chip, with
a usable bandwidth of approximately 100-3000 Hz.
The audio connections provided are:
Jack Function
MJ
connector
Telephone handset and compatible devices
1/8" stereo
jack
Power speakers, stereo headsets (mono-headsets require a stereo
to mono adapter jack, which is a stereo jack wired for mono
operation)
1/8" mono
jack
Microphone in
RCA jack Line In jack for external device input
Ethernet through an AMD local area network controller for Ethernet
(LANCE) adapter. Both AUI transceiver (thickwire) and 10Base-T
(twisted-pair) interfaces to Ethernet are provided. A setting in the system
support register of IOCTL ASIC selects the interface.
A 32 byte Ethernet address ROM.
256 KB of writable console ROM.
Access to two 7-segment LEDs, used to display a 2-digit hexadecimal code
for diagnostic purposes.
The Ethernet, ISDN, audio, printer, and communications ports have DMA
support.
SCSI Interface:
A dual SCSI interface chip (TCDS), which is connected to the TURBOchannel.
Two NCR53CF94-2 SCSI controller chips that interface to the TCDS ASIC
provide two 10 MB/s 8-bit single-ended SCSI buses, with DMA support.
Chapter 8 discusses the TURBOchannel Dual SCSI ASIC.
1–18 Introduction to the DEC 3000 Models 300/400/500/600/700/800/900 AXP
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