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APPENDIX D
Hardware
SwitchesThe controller card has a block of four switches located in the lower right hand corner.
What They Do
Switch 1, Interrupt Enable - This switch must be closed in
order for any interrupts generated by the Hard Drive to pass through to the Apple. (Interrupts are not used at this time.)
Switch 2, PS Enable - When
Switch 3, ][+ Boot Enable - Leaving this switch open allows a II+ or an unenhanced // e to boot directly from the hard
disk. If the hard disk is not to be the boot device in these systems, this switch should be closed. In a IIGS or an enhanced // e, this switch should also be closed.
Switch 4,
which slot it is in. With it open, the card uses the slot in which it is placed.
How To Set Them
To change the switch settings, use a small, pointed object, like a wooden toothpick or
Push down on | Push down on |
number side to | side marked “OPEN” |
close (ON) | to open (OFF) |
Side View | Side View |
(from right end) | (from right end) |