#A3000 & Ram
3 messages in this thread
I need to know how the Zip ram chip get put into the A3000. I have 1×4 zips
(total of 8 megs) what sockets would I start with and finish with…
Scott,
Start with the front two sockets, then every 4th socket back from those.
That's bank 0, the first 8 zips. The next 8 go right behind each of those.
If you can read the silkscreen on the board, it's U850-857 for bank 0 and
U858-865 for bank 1. The Printing on the chips faces front, or the beveled
corner faces left….
Note that if you have Dips in the DIP sockets just in front of the zip
area, you need to remove them. They're 256kx4 & you can't mix sizes. Those
sockets are electrically identical to bank 0 of the zips. You can put
those dips in as the second meg of chip ram…
You will also need to change a jumper to tell the system you're using 1m x
4 chips. J852 should be on 1-2.
-Jim
MOS via Autopilot & Amiga
Scott,
PMFJI…but I just completed that very same procedure on Saturday. I moved the
8 256kx4 dips over to the graphic ram section and added 8 1×4 zips to the fast
ram section. Jim's instructions are right on. Just a few more things. Get a
chip puller for the dips, they are hard to pull correctly without bending the
pins. Take your time and be gentle. watch out for static electricity. If you
have the manual "Introducing the Commodore amiga 3000" follow the instuctions
there for dismantling the CPU and installing the chips.
any questions, just ask.
The Bobster….going Amiga 'til the hard drive dies.