Award VTC820, User Manual

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INSTALLATIONS
VTC820 User’s Manual 11
Configuring the CPU Frequency
The VTC820 CPU card does not provide DIP switches to configure the
processor speed (CPU frequency). However, JP16 can be used to select
the Front Side Bus of the processor.
JP16: CPU Front Side Bus Select
JP16 Front Side Bus
Auto (Default)
100Mhz
133Mhz
JP2, JP3, JP4: RS232/422/485 (COM2) Selection
COM1 is fixed for RS-232 use only.
COM2 is selectable for RS232, RS-422 and RS-485.
The following table describes the jumper settings for COM2 selection.
COM2
Function
RS-232 RS-422 RS-485
Jumper
Setting
(pin closed)
JP2:
1-2
JP3:
3-5 & 4-6
JP4:
3-5 & 4-6
JP2:
3-4
JP3:
1-3 & 2-4
JP4:
1-3 & 2-4
JP2:
5-6
JP3:
1-3 & 2-4
JP4:
1-3 & 2-4
JP5: DiskOnChip Address Select
JP5 Address
D0000-D7FFF
D8000-DFFFF (default)