ZiLOG System 8000 Hardware Reference Manual

HRM
Zilog HRM
Table
4-10
SerLal Channels
and Baud-rate
Generators
SIO SIO CHANNELS BAUD
NO.
CTC NO.
CTC
CHANNEL
0
0
0
0
0
0 1
1
0
1
1
2 2
0 2
1
3
3
0
2
4
4
1
2
5
5
2
3
6 6 2
0
3
7
7
2
1
Serial channel 1 (console), with two exception, is identical
to every other serial channel.
The first exception is that the on-board monitor on the CPU
board uses channel 1 to communicate with the system operator
when the system is turned on. The initial baud rate for
channel 1 is factory set for 9600 by switch U70. It can be
set to one of the four values listed in Table 4-11. These
settings permit the use of a variety of terminals as the
system console. After the system has been booted, the con-
sole baud rate can also be changed under software control.
The 4-pole dip swtic~ on the CPU board selects the primary
boot device setting the baud rate for the monitor console.
The primary boot devi6e will always be listed and tested
first by the SPUD Diagnostics. System error messages are
sent to the console. This is the second exception.
Table 4-11 B;aud Rate and Primary Boot Device
S'~itch Setting (SW U70)
SWITCH
BAUD RATE SWITCH
PRIMARY BOOT DEV!CE
(ON = 0)
1 ,
4 2,
3
0 0
300 Baud
1 1
8" Disk
1
0
1200 Baud
0 1
5.25"
Disk
0
1
9600 Baud
1
0 SMDC
1 1
19200 Baud
0 0
Reserved
System software can access the I/O channels using standard
Z8000 I/O instructions. Table 4-12 lists the I/O addresses
of the I/O channels.
4-14
Zilog
4-14

ZiLOG System 8000 Specifications

General

Brand	ZiLOG
Model	System 8000
Category	Desktop
Language	English