Amiga 3000 zip ram problem

[agr]

Hello,

I'm trying to install zip chips into my recently acquired A3000. The chips are TC514402AZ-70. I've now put 8 of those in U850 to U857 (bank 0). I've put them with pin 1 on the left, next to the capacitors (can read the numbers on the chips from the front of the A3000).

The jumper J852 is put toward the front of the A3000, where it says 1Mx4.

No error on boot, no smoke; the problem is that the new ram is not shown in the WB titlebar or in ShowConfig.
Can someone help me make it working ?

Thanks !

[agr]

It's a standard 030, KS31, board rev 9, no accelerator.
Ramsey is 390541-04
DMAC is 390537-02

[agr]

It's a standard 030, KS31, board rev 9, no accelerator.
Ramsey is 390541-04
DMAC is 390537-02

EDIT: sorry for the double post but I having problems with chromium browser on this board and in amibay (also edit button does not work on chromium)

[agr]

All the chips are the same: SC.
I have the same problem with the 32 chips fitted. After system boot, 0 other ram

EDIT: chips are 70ns

[agr]

Yes, the ROMs have a sticker saying A3000 on them, branded Escom !? Don'know if they are the right one but the A3000 works fine and boot from the 512MB SCSI HDD. I did not inspected the soldering of the ZIP sockets as it require to completely remove the motherboard. I have also tried a set of 256k chips without success.
I also tried an A2058 Z2 memory board and it works fine.
Do you know any way to diagnose Ramsey ?

There is one strange modification on this motherboard, a 42MHz oscillator add-on wired next to the FPU. Any info on that is welcome ?

[agr]

I've found something intersting: I moved 1MB of chip ram to the fast ram DIP sockets and it works !
So, I will check the connections between the DIPs and ZIPs banks 0, it can be the soldering issue...

[agr]

The battery is starting to leak... but no damage yet.

@adz
If the zip chips are not working, I give little chance for a ZIP to SIMM converter to work on top of those zip sockets...

[agr]

Yes, with moving J852 to the 256k4 position. This board (rev 9) does not have J853.
I tested the connections between DIP and ZIP sockets bank 0 and they seem ok.
I re-tried now to put the DIP chips and they aren't recognized anymore (they are still ok in the chip ram section).

[agr]

@VingtTrois I'm equiped with ESD condoms (antistatic wrist strap and desk mat).

I'm interested by the absolute memory testing solution, this is what the system may do to detect the ram chips...

[agr]

@VingtTrois
This is very nice of you Thank you, but I just bought one of those Oktagon 2008 as you are using to test the chips. So if they work on the Oktagon, I will have 8Mb usable for sure. I guess this ram will be slower... but I just need a good working Amiga as a reference machine for my hobby development of AROS.

I still have to:
- replace the leaking battery
- install the network Xsurf card + AmiTCP or something

[agr]

There is a clock speed jumper for Ramsey (J851) and a clock 90 jumper (J100) both need to be set for 16 or 25 Mhz.

All these jumpers are set to the 25MHz position, like on:
http://amiga.resource.cx/photos/photo2.pl?id=a3000&pg=7&res=hi&lang=en
same board, same chips config, same jumpers

Your problem is most likely an open connection to any one of the ZIP chips. Could be a bent pin, poor solder joint or broken trace.

I checked with a multi-meter, the DIP and ZIP sockets are connected on bank 0; seems ok to me and I just don't like to remove the motherboard completely...

It's worth the effort to fix the problem.

Yes, I'm trying to :hammer:

Can someone post a ShowConfig output of his A3000 with FastMEM on the motherboard ? Thanks

I'm trying with a little prog to write then read a value back from the FastMEM, according to this memory map: http://gega.homelinux.net/AmigaDevDocs/hard_d.html#d-2. I tried $0700 0000 without success :furious:

[agr]

I tried also 07F0 0000 as I have now 1MB: no success.

I've found a diagnostic rom for Amiga Forever (I have a license): logica-dialoga-200.rom. This may test better my A3000; it looks fine in WinUAE. How can I load this ROM (512k file) into my A3000 ?

[agr]

I bought an Oktagon 2008 on eBay, just for testing my zip ram chips and there is a problem at boot. The autoconfig screen shows this board 2092/8 as DEFECTIVE.

What do you think ?
a) my chips are defective
b) the Oktagon is defective

@VingtTrois I will have to send you my chips for testing. If you agree, please send me your address.

[agr]

Take the chips away and look again.

I did it and googled for: Amiga Oktagon 2008 zip orientation
and found this: http://brain-plasticity.safe-install.com/  :whack:
and then I RTFM of the Oktagon in german :rtfm:
and found that I mounted the chips in the wrong orientation :madashell:

I fliped the chips and everything is ok.
> cpu nodatacache
> checkmem times 1000
... still running without error on the first half 8Mb.
Those chips are very resistant (also the Oktagon 2008...) !

Now for the A3k mb zip sockets, I did put the chips with pin 1 toward the caps, on the left when looking at sockets from the from of the A3k. Is that ok ?

[agr]

Hello Amiga fans,

After 15 years, I post where did this go and what is the problem now.

I don't remember when, but my A3000 was fine with 2M chip + 16M fast zip RAM. I think the problem was solved by setting some jumper in the correct position.

And now, recently I flushed some Zorro cards around. At some point everything worked including +8M zip on my Oktagon 2008 and a SCSIknife on it. Then I removed the Oktagon to attach the SCSIknife to it, reinserted the card and the 16M zip disappeared.

I've seen another topic here on this forum: 'Amiga 3000 fastram suddenly disappeared' https://forum.amiga.org/index.php?topic=74971.0

So as suggested I used ziptest. It shows faults on U850, U858 all the way up to U875. If I swap those zip with U854 .. U879, the result is the same.

Can anyone help me to solve this issue ? Should I ask in the other topic ?

Thank you