2500XL/2  
(250-4075)                 Settings                   Faxback Doc. # 1483

This chart lists the valid jumper settings for the 2500 xl/2. Factory 
default settings are marked with an asterisk (*).

JUMPER SETTINGS
┌───────────────────┬────────────────────────┬────────────────────────────┐
│FUNCTION           │ DESCRIPTION            │ JUMPER SETTING             │
├───────────────────┼────────────────────────┼────────────────────────────┤
│Video Interrupt    │ Standard *             │ E17 and E18-no connection  │
│                   │ IRQ9                   │ E17 and E18-installed      │
├───────────────────┼────────────────────────┼────────────────────────────┤
│On-Board Video     │ Enabled *              │ E14 and E15-installed      │
│                   │ Disabled               │ E15 and E16-installed      │
├───────────────────┼────────────────────────┼────────────────────────────┤
│BIOS ROM           │ 4MB or 8MB ROM *       │ E10 and E11-installed      │
│Location           │ Two 32KB x 8 EPROMs    │ E9 and E10-installed       │
│                   │ (U39 and U40)          │                            │
├───────────────────┼────────────────────────┼────────────────────────────┤
│Audio Input        │ Microphone *           │ E25 and E26-installed      │
│Source             │ Line-level             │ E26 and E27-installed      │
├───────────────────┼────────────────────────┼────────────────────────────┤
│Audio Output       │ Headphone *            │ E28 and E29-installed      │
│Source             │ Line-level             │ E29 and E30-installed      │
├───────────────────┼────────────────────────┼────────────────────────────┤
│Monitor Type       │ Non-standard multiple- │ E23 and E24-installed      │
│                   │ frequency monitor      │                            │
│                   │                        │                            │
│                   │ VGA analog monitor or  │ E23 and E24-installed      │
│                   │ standard multiple-     │                            │
│                   │ frequency monitor *    │ E22 and E23-installed      │
├───────────────────┼────────────────────────┼────────────────────────────┤
│VGA BIOS           │ PS/2 mode *            │ E20 and E21-installed      │
│                   │ AT mode                │ E19 and E20-installed      │
├───────────────────┼────────────────────────┼────────────────────────────┤
│IDE (SmartDrive)   │ Disable *              │ E31 and E32-installed      │
│Activity           │ Enable                 │ E32 and E33-installed      │
│Indicator          │                        │                            │
└───────────────────┴────────────────────────┴────────────────────────────┘

INSTALLING THE AUDIO JUMPERS

The Music and Sound features enable you to connect a microphone, an 
earphone, or a stereo headphone as soon as you set up the computer.  To 
connect a line-level audio device such as a radio or a tape recorder, you 
must adjust the two audio jumpers on the main logic board.  With the 
jumpers in the line audio position, you can connect line-level devices to 
the microphone (input) and headphone (output) connectors. Refer to "Main 
Logic Board Layout" to locate the Audio Input Source and the Audio Output 
Source jumpers.  Read the following sections before connecting line-level 
audio devices.

AUDIO INPUT SOURCE JUMPER

The Audio Input Source jumper pins are labeled E25, E26, and E27. The 
jumper installed on these pins enables you to direct sounds from audio 
devices through the computer. For example, you can connect a microphone to 
the MIC connector to input your voice.

By default, the Audio Input Source jumper is installed on Pins E25 and E26 
to enable the connection of a microphone. Install the jumper on Pins E26 
and E27 to enable the connection of a line-level audio input device (and 
disable the connection of a microphone).

AUDIO OUTPUT SOURCE JUMPER

The Audio Output Source jumper pins are labeled E28, E29, and E30. The 
jumper on these pins enables you to direct sounds from the computer to an 
audio device. For example, you can connect a stereo headphone to the EAR
connector on the computer. Sounds from the computer are sent through the
headphone so that only you can hear them. When no device is plugged into 
the EAR connector, sound is sent through the  built-in speaker. If you are 
using the built-in speaker, the Audio Output Source jumper is installed in
either position. 

By default, the Audio Output Source jumper is installed on Pins E28, and 
E29, enabling the connection of an earphone or a headphone. Install the 
jumper on Pins E29 and E30 to enable the connection of a line-level audio 
output device (and disable the connection of an earphone or a headphone)

(/tmc-09/08/95)