For detailed instructions on how to connect the drives to the optional floppy disk controller card, consult the documentation supplied with the card itself. The drive cables for drives A and B are normally connected to connector CN5 on the system board (shown in Figure A-2). If a different cable was supplied to connect the drives to the optional controller card, make a careful note of how the original drive cable was connected, and remove it from the computer. Keep it in a safe place, in case you need to remove the optional controller for any reason.

 

 

 

FRONT

 

 

 

 

 

 

 

 

6M and 6N

 

 

 

 

 

 

 

 

J2

 

 

 

 

 

 

/

 

 

 

 

 

 

 

7M and 7N

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

/

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure A-2. Jumper locutions

To disable the built-in floppy disk controller, you must first remove the cover of the main unit (see “Removing the Cover” in Chapter 3). Then locate Jumper J1 on the main system board, near the option slots, as shown in Figure A-2. You may need to remove an option card from slot number five in order to access this jumper. The factory setting is position A. To disable the internal floppy disk controller, move the jumper to position B. If you have also installed an additional disk drive, remember to adjust the appropriate DIP switches on the front panel to match the number of drives installed.

A-2