Everything You Always Wanted To
But Were Too Polite To Ask
Amiga Technical References
For installation of 8372A or 8375 Agnus in an Amiga 2000:
For this you will need:
- an 8372A Agnus or an 8375 Agnus
- Phillips screw driver
- small jewellers flathead screwdriver OR an exacto knife.
- A PLCC chip extractor OR a small flathead screwdriver and a lot of
- these instructions printed out since your machine will most likely be
- Turn everything off.
- Open the machine.
- Remove the cover (5 screws, 2 on each side and one the back)
- Remove the drive chassis (4 screws on the back and either 2 or 3 on the
- Look on the motherboard, you will see a big square chip labelled something
like 8370 and AGNUS written beside the socket. This is the chip you want to
- Remove the chip the easiest way you find possible. (small flathead screw
driver and a lot of patience or just get a chip puller for a PLCC type chip)
- Insert 8372A or 8375 Agnus. You MUST match up pin 1 on the chip with pin 1
on the socket/board. The chip has a dimple along one side that signifies pin
1 and the motherboard will have a 1 on it and in some cases the socket will
have a dimple in it too. Match them! VERY
- Make sure the chip is in solid.
- Look for jumper J101 beside the power connector to the motherboard. Change
it to the opposite position (pins 3 and 2 closest to the connection I
- Look for trace J500 at the back of the machine near the CIA's (8520's)
It's a jumper trace that you will have to cut with a razor blade, small flat
head screw driver or exacto knife.
- Once all of this is done. Turn the machine on to see how it works.
Copyright © 2000 Amiga Auckland Inc. All rights reserved.
Revised: June 16, 2005.