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vector ZCB Single Board Computer
selecting the port addresses desired.
For standard use in vector Graphic
Microcomputer Systems, the default addresses are adequate.
For more
involved systems, it may be necessary to change port addresses.
This is
accomplished by merely changing some jumper connections on the ZCB board.
The first thing
to
do is to decide what port addresses you wish to use.
There are eight groups of thirty-two port addresses you can choose from.
All the port addresses mus t be chosen from the same group.
They are as
follows:
I/O Port Address Groups
Group
Port Address(Hex)
JUMPER
AREA
G
I
DO-IF
9-6, 8-4, 7-2
II
20-3F
9-5, 8-4, 7-2
III
40-5F
9-6, 8-3, 7-2
IV
60-7F
9-5, 8-3, 7-2
v
80-9F
9-6, 8-4, 7-1
VI
AO-BF
9-5, 8-4, 7-1
VII
CO-DF
9-6, 8-3, 7-1
VIII
EO-FF
9-5, 8-3, 7-1
Within these groups, port addresses are assigned in increments of four:
Port Mdress Increments within Groups
AREA
GROUP
E
PAD
I
II
III
IV
V
VI
VII
VIII
NO.
(all addresses expressed in hex)
3
00
20
40
60
80
AO
CO
EO
4
04
24
44
64
84
A4
C4
E4
5
08
28
48
68
88
A8
C8
E8
6
DC
2C
4C
6C
8C
AC
CC
EC
7
10
30
50
70
90
BO
DO
FO
8
14
34
54
74
94
B4
D4
F4
9
18
38
58
78
98
B8
D8
F8
10
lC
3C
5C
7C
9C
BC
IX:
FC
1)
'Ib
change port addresses, first decide which group you wish to use and
jumper area G as per the I/O Port Address Groups Chart.
If you wish to
chose an address within Group I, jumper area G will not have to be changed
unless the jumpers have been cut.
If you wish to choose an address from
Groups
II-VIII,
first cut the standard jumpers in area G and rejumper as per
chart G.
2) Once the group address has been jumpered, the actual serial and parallel
port add resses can
be
chosen.
If you want the serial base address to
be
X4
and the parallel base address to be X8 then you do not need to change jumper
area
E
unless the jumpers have been previously changed.
'Ib
set the address
at other than the standard, first cut any pre-existing jumpers and jumper as
per the Port Address Increments within Groups chart.
To
set the serial port
addresses jumper from Pad 1 to the desired address pad.
To
set the parallel
port base address jumper from pad 2 to desired address pad.
2-8
Rev. I-B
6/11/80
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