Video Graphics Controller Board - Compaq PORTABLE 386 Maintenance And Service Manual

Switch Function
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1 Reserved - Always OFF
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2 Serial Port Enable/Disable
2 = ON
2 = OFF
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3, 4 Parallel Port Select/Disable
3 = ON
3 = OFF
3 = ON
3 = OFF
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5, 6 Serial Port Select
5 = ON
5 = OFF
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(Assy No. 000990)
Switch Function
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1 Reserved - Always OFF
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2 Reserved - Always OFF
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3, 4 Parallel Port Select/Disable
3 = ON
3 = OFF
3 = ON
3 = OFF
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5, 6 Serial Port Select/Disable
5 = ON
5 = OFF
5 = OFF
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Chapter 9.6 Video Graphics Controller Board
Figures 9-5 and 9-6 show the Video Graphics Controller Boards and Table 9-16
lists approximate jumper settings.
Table 9-16. Video Graphics Controller Board Jumper Settings
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(Assy No. 109360)
Jumper
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J1
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J2
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(Assy No. 000806)
Jumper
Function
Video RAM
1-2 16 bit (default)
2-3 8 bit
Video ROM
2-3 8 bit (default)
1-2 16 bit
Function
Enabled
Disabled
4 = ON LPT1 Selected
4 = ON LPT2 Selected
4 = OFF LPT3 Selected
4 = OFF LPT Disabled
6 = ON COM1 Selected
6 = ON COM2 Selected
4 = ON LPT1 Selected
4 = ON LPT2 Selected
4 = OFF LPT3 Selected
4 = OFF LPT Disabled
6 = ON COM1 Selected
6 = ON COM2 Selected
6 = OFF Serial Port Disabled