Amiga 3000 zip ram problem

[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

[agr]

Hello and thank you for your reply.

Does the fast memory work normally again if you remove all of the Zorro expansions?

not anymore

I gather you've got 32 x 1Mbit ZIPs fitted to the A3000.  Are you saying that ZIPtest indicates that the first three 4MB blocks of fast memory is not working, but the last 4MB is showing as good?  Please post the entire test output from ZIPtest here as it's not obvious what's possibly good or bad, or what aspect of the test fails.

Here is just the result of the first part of ziptest:

ZIPTest 1.1 (2024-01-17) by Chris Hooper
CPU: 68030 with Burst
Memory controller: Ramsey-04 $d $38 (25.05 MHz)
Memory config: 1Mx4 (4MB per bank)
Memory refresh: 240 clocks (9.60 usec)

Data line test
  Socket   ADDR    IO1  IO2  IO3  IO4   Socket   ADDR    IO1  IO2  IO3  IO4
  -------- ------- ---- ---- ---- ----  -------- ------- ---- ---- ---- ----
  U881 3.7 71ffffb Good Good Good Good  U879 3.5 71ffffa Good Good Good Good
  U873 2.7 75ffffb Good Good Good Good  U871 2.5 75ffffa Good Good Good Good
  U865 1.7 79ffffb Good Good Good Good  U863 1.5 79ffffa Good Good Good Good
  U857 0.7 7dffffb Good Good Good Good  U855 0.5 7dffffa Good Good Good Good
  U880 3.6 71ffffb Good Good Good Good  U878 3.4 71ffffa Good Good Good Good
  U872 2.6 75ffffb Good Good Good Good  U870 2.4 75ffffa Good Good Good Good
  U864 1.6 79ffffb Good Good Good Good  U862 1.4 79ffffa Good Good Good Good
  U856 0.6 7dffffb Good Good Good Good  U854 0.4 7dffffa Good Good Good Good
  U877 3.3 71ffff9 Good Good Good Good  U875 3.1 71ffff8 1    1    1    1   
  U869 2.3 75ffff9 Good Good Good Good  U867 2.1 75ffff8 1    1    1    1   
  U861 1.3 79ffff9 Good Good Good Good  U859 1.1 79ffff8 1    1    1    1   
  U853 0.3 7dffff9 Good Good Good Good  U851 0.1 7dffff8 1    1    1    1   
  U876 3.2 71ffff9 Good Good Good Good  U874 3.0 71ffff8 1    1    1    1   
  U868 2.2 75ffff9 Good Good Good Good  U866 2.0 75ffff8 1    1    1    1   
  U860 1.2 79ffff9 Good Good Good Good  U858 1.0 79ffff8 1    1    1    1   
  U852 0.2 7dffff9 Good Good Good Good  U850 0.0 7dffff8 1    1    1    1   


I can post more logs, starting with Bank0  only. Note that nibble 0 and 1 are faulty, anyhow Bank0 only or all populated.

If you briefly pull the _FAIL line low, does the fast memory then appear normally afterwards?  You can do this by briefly linking U190 (real time clock IC) pin 2 to ground (the metal chassis) with the system running, which will force a hardware reset and initialise the fast memory controller (U890) to the correct power-up state.

... will do that, I'm printing the schematics big enough for my eyes.

Failing that, it may be worthwhile collecting more clues using DiagROM and using the 'Slow scan of 16MB fastmem-areas' to see what's going on.  Again, post the test result here.

I don't have DiagROM now. I have just one pair of EPROMs and a programmer. Please tell me which files I need flash so I do it the right way.

I appreciate your help 

PS:
1. I have an Indivision ECS in the mix
2. found DiagROM.zip and DiagROMV2.zip via archive.org (diagrom.com is down for me)
3. have a pair of TC574200D and an UV eraser