This switcher accepts two different kickstart ROMs for an Amiga 500 or 2000 computer. Remove the existing kickstart ROM you have in your computer and replace it with the 40-pin connector attached to the kickstart board. MAKE SURE YOU LINE UP PIN 1 PROPERLY! Insert the ROMs you want to use into the kickstart board. The one in the second socket will be the default ROM that is used. Again, MATCH UP PIN 1! The clip with BLACK wire must connect to pin 5 of GARY chip (IC U102 for A2000, and IC U5 for A500). The clip lead with RED wire can be connected to various places inside the Amiga, depending on HOW you want to switch to the other ROM.

For Amiga 2000:

Switch to first slot by:	Location	Pin
Holding down LEFT mouse on re-boot	CIA (U300)	8
Holding down RIGHT mouse on re-boot	PAULA (U200)	33
Holding down Joystick fire on re-boot	CIA (U300)	9

For Amiga 500:

Switch to first rom slot by:	Location	Pin
Holding down LEFT mouse on re-boot	CIA (U7)	8
Holding down RIGHT mouse on re-boot	PAULA (U3)	33
Holding down JOYSTICK FIRE	CIA (U7)	9
Holding down LEFT SHIFT key on re-boot	6570-036	25
Holding down RIGHT SHIFT key on re-boot	6570-036	29
Holding down LEFT ALT key on re-boot	6570-036	24
Holding down RIGHT ALT key on re-boot	6570-036	28

Note: the 6570-036 is the keyboard processor that is on the A500 keyboard assembly, it is the only 40 pin (large) IC on the keyboards electronic section (to the left of the power/drive LEDs). It is recommended that A500 users use the LEFT SHIFT key to switch to the first ROM socket. The reason is simple, if you press CTRL-R.AMIGA-L.AMIGA the shift is right there with the rest of your fingers! Remember, the ROM that is switched in is the one in the first socket (closest to the ribbon cable) If you boot without pressing any buttons, then the ROM located in the second socket is used first.

Thanks to Greg Scott (National Amiga) and Michael Wilkins