How to ID memory in an A3000

[Amiga4k]

1Mbit x 4  20 pin ZIP   80ns   4 megabytes per bank
 
 The ZIP sockets can hold up to 32 1x4 Megabit ZIPs, or 32 4x256k ZIPs. You cannot mix the different sizes together, no matter what.
In the ZIP area there are 4 banks. Each bank takes 8 chips. Again, all the chips in the whole ZIP area must be of the same size.
The banks are not all in one line. They are every forth socket. See the accompanying picture listing the banks. When plugging ZIPs in, take great care. Those little legs are quite fragile and have a tendency to bend, or miss their sockets.
Set this jumper appropriately:
J852 connecting pins 2 & 3 : 1Mbit, in 256k x 4
J852 connecting pins 1 & 2 : 4Mbit, in 1m x 4

Now, having answered the initial question, you will find it hard to locate these zips.
 :-?

[Amiga4k]

At the present, can not locate that pic.
Installation is straight forward.There are 8 pieces per 4 megs, thus Bank0 has slots 0-7. Look at the ram slots.Starting at the left bottom corner, that is position Bank0, slot 0.
As you said it had only 4 megs, read the board as follows:
Bank0,slot0 filled.
Go UP one slot. That is Bank1, slot0.
Go UP one slot. That is Bank2, slot0.
Go UP one slot. That is Bank3, slot0.
Go UP one slot. That is Bank0, slot1 filled
Go UP one slot. That is Bank1, slot1.
Go UP one slot. That is Bank2, slot1.
Go UP one slot. That is Bank3, slot1.

Your Bank0, slot0-7 are filled. Next fill Bank1, slot0-7.

1M x 4 static colum Toshiba TC514402  or  OKI MSM514402

1M x 4 page mode Toshiba TC514400, Hitaci HM514400, NEC uPD424400, OKI MSM514400

You can not fix and match, all must be either page or static.

[Amiga4k]

To answer your questions about ram, I sent you an inidepth email to your yahoo address. The other question: the fast slot is for an A3000 desktop compatible accelerator card.
A3640 v3.1 oe v3.2 acceptable
Apollo 3040/3060 difficult card, problems.
CyberStorm Mk2 or 3 -- great card
G-Force 040, great card, BUT uses only pricy GVP memory
Warp Engine -- no personal info on card.

With added cards, you need the manual. The Apollo's in the A3000 or A4000 are extremely difficult to setup.

Before you wander any further, you should to pull the drive and power tray, to expose the motherboard. You should write down all the chip versions. Example: Buster, Ramsey, DMAC, and SCSI.