DTA: Jumpers/Switches/Controls
Jumpers/Switches/Controls
DIP Switch Settings
I/O Address Switch Settings (SW1-SW3)
Jumper Settings
DIP Switch Settings
Switch Setting Function
SW1 See following I/O address
SW2 table
SW3
SW4 Closed* Reserved
SW5 Closed* On-board VGA enabled
SW5 open On-board VGA disabled
SW6 Closed* 16-bit VGA BIOS transfer
SW6 open 8-bit VGA BIOS transfer
SW7 Closed* Reserved
SW8 Closed* Reserved
*Default setting
I/O Address Switch Settings (SW1-SW3)
SW1 SW2 SW3 I/O Address
Closed Closed Closed 280h - 28Fh
Closed Closed Open 290h - 29Fh
Closed* Open* Closed* 2A0h - 2AFh
Closed Open Open 2B0h - 2BFh
Open Closed Closed 2C0h - 2CFh
Open Closed Open 2D0h - 2DFh
Open Open Closed 2E0h - 2EFh
Open Open Open Reserved
*Default setting
Jumper Settings
Pins
Jumper Jumpered Function
JM1 1-2 MEM16 decode: low and high addresses
2-3* High addresses only
JM2 1 ONLY* Unqualified IO16
1-2 Qualified IO16
JM3 1-2* 1-MB RAM
2-3 4-MB RAM
*Default settings
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