Vax 613 0S Instruction Manual Page 20

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TURBOchannel Option Slots:
The 300, 300X, and 300LX models contain two TURBOchannel option slots.
Each slot has 64 MB of I/O address space.
The 300L model contains no option slots.
I/O Subsystem:
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)
Three serial lines, through two Zilog SCC (Z85C30) dual UARTS
(universal asynchronous receiver/transmitters)—SCC0 and SCC1
* Asynchronous for keyboard—Port A of SCC1
* Asynchronous for mouse—Port A of SCC0
* CCITT V.24/V.28 19.2 KB/s asynchronous/synchronous 25-pin plug for
communications—Port B of SCC0.
An AMD 79C30A (Revision E) chip, providing both an ISDN-S interface
and voice-quality audio with a usable bandwidth of approximately 100 Hz
- 3000 Hz
The following audio interfaces are supported:
* The loudspeaker outputs of the 79C30A are connected to a speaker
located inside the system box.
* The differential ear-out and mic-out signals from 79C30A lead to
an external MJ4 telephone jack located on the rear I/O panel of the
system box. This jack supports connections to a telephone handset or
an operator headset.
Ethernet through the AMD local area network controller for Ethernet
(LANCE) adapter. The external interface to the Ethernet is a 10BaseT
twisted pair connector.
A 32 K x 8 Ethernet address ROM.
768 KB of Flash memory used for system firmware composed of three 256
KB flash memory Devices. Control bits in the System Support Register of
the IOCTL ASIC select the memory devices.
Access to two 4-bit LED displays to display a 2-digit hexadecimal code for
diagnostic purposes. (See
The Ethernet, ISDN, audio, printer, and communications ports have DMA
support.
1–4 Introduction to the DEC 3000 Models 300/400/500/600/700/800/900 AXP
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