Cray CRAY-1 - CRAY-1 I;O Channels Overview

I
INPUT IOUTPUT SECTION
6
I/O CHANNELS
The Input/Output section of the CRAY-l contains 24 I/O channels of which
twelve are input channels and twelve are output channels. The channels
are assigned the
numbers 2 through 31
8
,
Three basic types of control logic for I/O channels are available:
1. 16-bit asynchronous, for which three versions exist and are
identified by their module types, as follows:
a.
OJ/OK module, used for MCU interface only
b. OU/OK module, used for interfacing other devices
(normal)
c.
OV/OK module, used for interfacing other devices
(special)
2.
16-bit
high-speed asynchronous
3.
16-bit
synchronous (disk
channel)
Each type of channel has the same electrical interface to the I/O cable
but
differs in timing, protocol, and data rates.
CHANNEL GROUPS
Channels are divided into four groups, as follows:
Group
1
Input channels
2, 6,
12,
16, 22,
26
Group
2
Output channels
3,
7 ,
13,
17,
23,
27
Group 3 Input channels
4,
10, 14,
20, 24, 30
Group
4
Output channels
5,
11,
15, 21, 25,
31
I/O INSTRUCTIONS
The instructions used with I/O channels are:
0010jk
0011j k
0012jx
0033ijk
2240004
Set the current address (CA) register for the channel
indicated
by (Aj) to (Ak) and activate the channel
Set the limit address (CL) register for the channel
indicated
by (Aj) to (Ak)
Clear the interrupt flag and error flag for the channel
indicated
by (Aj)
Transmit
I/O status to Ai
6-1
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