·
ISA Bus Clock
: Default setting is 7.16MHz for any CPU speed.
Latest ISA adapters may operate with ISA bus clock speed up to
10MHz. ISA bus speed above 10MHz is not recommended.
Different than 7.16MHz speed can also be selected by following
below table.
CPU Clock Speed
ISA Bus Clock
20MHz
1/3 CLK = 6.67MHz
25MHz
1/3 CLK = 8.33MHz
33MHz
1/4 CLK = 8.33MHz
40MHz
1/5 CLK = 8.00MHz
50MHz
1/6 CLK = 8.33MHz
·
Local Bus Ready, Latch Local Bus Device
: Follow below table to
set these options.
CPU Clock Speed
Local Bus
Ready
Latch Local
Bus Device
20MHz
TRANS
2T
25MHz
TRANS
2T
33MHz
SYNC
2T
40MHz
SYNC
2T
50MHz
SYNC
2T or 3T
AUTO CONFIGURATION WITH BIOS DEFAULTS
Use this option to load the default configuration values directly from
ROM. If the stored record created by the Setup program becomes
corrupted, these defaults will load automatically when you turn the
computer on.
AUTO CONFIGURATION WITH POWER-ON DEFAULTS
Use this option to load the settings detected by the system when you turn
it on. It your system behaves erratically you can use this feature to check
for incorrect settings.
486MIS System Board User's Manual Page 33
