HP Portable 386 Compaq Portable 386 Personal Computer Maintenance and Service - Page 157

Video Graphics Controller Board

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Switch Function 1 Reserved - Always OFF 2 Serial Port Enable/Disable 2 = ON Enabled 2 = OFF Disabled 3, 4 Parallel Port Select/Disable 3 = ON 4 = ON LPT1 Selected 3 = OFF 4 = ON LPT2 Selected 3 = ON 4 = OFF LPT3 Selected 3 = OFF 4 = OFF LPT Disabled 5, 6 Serial Port Select 5 = ON 6 = ON COM1 Selected 5 = OFF 6 = ON COM2 Selected (Assy No. 000990) Switch Function 1 Reserved - Always OFF 2 Reserved - Always OFF 3, 4 Parallel Port Select/Disable 3 = ON 4 = ON LPT1 Selected 3 = OFF 4 = ON LPT2 Selected 3 = ON 4 = OFF LPT3 Selected 3 = OFF 4 = OFF LPT Disabled 5, 6 Serial Port Select/Disable 5 = ON 6 = ON COM1 Selected 5 = OFF 6 = ON COM2 Selected 5 = OFF 6 = OFF Serial Port Disabled 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 (Assy No. 109360) Jumper Function J1 Video RAM 1-2 16 bit (default) 2-3 8 bit J2 Video ROM 2-3 8 bit (default) 1-2 16 bit (Assy No. 000806) Jumper Function

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Switch
Function
------------------------------------------------------------------------------
1
Reserved - Always OFF
------------------------------------------------------------------------------
2
Serial Port Enable/Disable
2 = ON
Enabled
2 = OFF
Disabled
------------------------------------------------------------------------------
3, 4
Parallel Port Select/Disable
3 = ON
4 = ON
LPT1 Selected
3 = OFF
4 = ON
LPT2 Selected
3 = ON
4 = OFF
LPT3 Selected
3 = OFF
4 = OFF
LPT Disabled
------------------------------------------------------------------------------
5, 6
Serial Port Select
5 = ON
6 = ON
COM1 Selected
5 = OFF
6 = ON
COM2 Selected
------------------------------------------------------------------------------
(Assy No. 000990)
Switch
Function
------------------------------------------------------------------------------
1
Reserved - Always OFF
------------------------------------------------------------------------------
2
Reserved - Always OFF
------------------------------------------------------------------------------
3, 4
Parallel Port Select/Disable
3 = ON
4 = ON
LPT1 Selected
3 = OFF
4 = ON
LPT2 Selected
3 = ON
4 = OFF
LPT3 Selected
3 = OFF
4 = OFF
LPT Disabled
------------------------------------------------------------------------------
5, 6
Serial Port Select/Disable
5 = ON
6 = ON
COM1 Selected
5 = OFF
6 = ON
COM2 Selected
5 = OFF
6 = OFF
Serial Port Disabled
==============================================================================
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
==============================================================================
(Assy No. 109360)
Jumper
Function
------------------------------------------------------------------------------
J1
Video RAM
1-2 16 bit (default)
2-3 8 bit
------------------------------------------------------------------------------
J2
Video ROM
2-3 8 bit (default)
1-2 16 bit
------------------------------------------------------------------------------
(Assy No. 000806)
Jumper
Function