Specifications

To use the advanced SCU feature:
1. If the system has more than 16 MB of memory, you must inform SCO
UNIX that the 15 MB to 16 MB memory area is not for system use. To
do this, you must edit the /etc/default/boot file. Search for the following
string:
DEFBOOTSTR=hd(40)unix
Change it to read:
DEFBOOTSTR=hd(40)unix mem=1m-15m,16m-192m/s/n
You must make this change before you enable the advanced feature in the
SCU. If you forget to change this file, type the following string at the boot
prompt:
hd(40)unix mem=1m-15m,16m-192m/s/n
2. Reboot the system and run the SCU.
3. At the second SCU screen ("Welcome"), press
Ctrl/A
. The "Welcome" changes
to "Advanced Configuration."
4. Select "Configure computer" and then "View or edit details."
5. Two new choices are added to the system board settings: "Extended
memory range definition" and "Additional expansion board address space."
Do not change the "Extended memory range definition" option. Highlight
"Additional expansion board address space," press
Enter
, and select
Enabled
.
The 15 MB to 16 MB memory range can now be used by options.
For more information on how to specify a memory range, refer to the man page
on "boot."
5.9.1 Installing More than One Terminal Multiplexer
The Digital terminal multiplexer supports addressing in the 15 MB range.
Up to four terminal multiplexers can be installed, if the addresses of the
multiplexers are between FA0000h and FD0000h.
Install the multiplexers as follows:
1. Set the first multiplexer installed to an address of FA0000h, the second to
FB0000h, the third to FC0000h, and the fourth to FD0000h.
2. Use the multiplexer’s ISA CFG file (ISAC0001.CFG) to specify these
addresses for the modules.
System Configuration 5–23