Compaq Portable 286 Compaq Portable Computer, Compaq Plus Personal Computer, a - Page 112

Compaq Portable 286 Diskette/Tape Controller Board Switch and Jumper Settings

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If both a monochrome video display controller board (with external monochrome display) and a COMPAQ video display controller board are installed, the monochrome video display will be active during power on if the display select jumper (ED) is set on pin 1 to pin 2. Table 8.4. COMPAQ PORTABLE 286 System Board Jumper Settings Jumper Location Function Pin to Pin 2 Pin 2 to Pin 3 ED Display select Monochrome video COMPAQ dual mode display controller video display controller, non COMPAQ extended graphics controller, non COMPAQ RGB controllers (default setting) ES Speed select Primary or fast Secondary or common speed (8 MHz) speed (default setting) EM Future Use Do not change Do not change (default setting) E1 - E3 System Board Memory 128 Kbytes, 640 Kbytes or "MS" 256 Kbytes, or 512 Kbytes * * For optional 512 Kbyte configuration, PAL (PN 105045-001) must be installed in U2 if not already present. Chapter 8.5 Compaq Portable 286 Diskette/Tape Controller Board Switch and Jumper Settings Two different versions of the board may be used in the COMPAQ PORTABLE 286 for control of the diskette/tape controller. Version 1 contains jumpers J1, J2, J3, and J4; Version 2 contains Switch SW1 and shunt jumpers J1 and J2, which replace jumpers J1 through J4. Determine which board is installed by referencing Figure 8.5-1 and 8.5-2 before changing the settings.

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If both a monochrome video display controller board (with external monochrome
display) and a COMPAQ video display controller board are installed, the
monochrome video display will be active during power on if the display select
jumper (ED) is set on pin 1 to pin 2.
Table 8.4. COMPAQ PORTABLE 286 System Board Jumper Settings
==============================================================================
Jumper
Location
Function
Pin to Pin 2
Pin 2 to Pin 3
------------------------------------------------------------------------------
ED
Display select
Monochrome video
COMPAQ dual mode
display controller
video display
controller, non
COMPAQ extended
graphics controller,
non COMPAQ RGB
controllers (default
setting)
------------------------------------------------------------------------------
ES
Speed select
Primary or fast
Secondary or common
speed (8 MHz)
speed (default
setting)
------------------------------------------------------------------------------
EM
Future Use
Do not change
Do not change
(default setting)
------------------------------------------------------------------------------
E1 - E3
System Board Memory
128 Kbytes,
640 Kbytes
or "MS"
256 Kbytes, or
512 Kbytes *
------------------------------------------------------------------------------
* For optional 512 Kbyte configuration, PAL (PN 105045-001) must be
installed in U2 if not already present.
==============================================================================
Chapter 8.5 Compaq Portable 286 Diskette/Tape Controller Board Switch and Jumper Settings
Two different versions of the board may be used in the COMPAQ PORTABLE 286 for
control of the diskette/tape controller. Version 1 contains jumpers J1, J2,
J3, and J4; Version 2 contains Switch SW1 and shunt jumpers J1 and J2, which
replace jumpers J1 through J4. Determine which board is installed by
referencing Figure 8.5-1 and 8.5-2 before changing the settings.