2nd hand A4000 does not show Fast Mem. How come ?

[Effy]

I have an A4000 desktop here (one of three) with an original 68030 and superbuster 9 and a battery that looks not like a disaster. I don´t see any traces of acid on the board, though the battery itself has some corrosion (?) on it but this can be removed by using a strong toothbrush.
When I tried it it refused to boot up, giving a green screen and once in a while blink and then gave again a green screen.
So I opened it up and saw the problem : no Ram. So I searched in my cigar-box with Ram modules and after trying a few times the A4000 finally booted up giving 2 Mb Chip. Cool !! But the problem started at this point when I tried to add Fast Ram. This is until now still not recognized. I use modules of 4 Mb and 8 Mb, one at a time and this at every place I can put a module in (4). The modules itself can not be faulty, not all of them. So what am I doing wrong There is no harddrive connected, only floppy, and it does boot up from that one ... there is also no Zorro card inside  ... have I forgotten something

[Effy]

Is this one of those "things in life that can happen" Does this mean that the only way to add Fast Ram is a turboboard or a FastLane scsi controller I do have got a FastLane (from Ebay) but I haven´t tried it yet ... and I have no turboboard ...  

[Effy]

I have tried several Simms, 4 Mb,8 MB,16 MB, and this in bank 1 to 4, which means I had to do a lot of replacing. None of them works, only the chip mem works and this turns out to be 2 Mb when I get into the workbench...

[Effy]

Did some more experimenting. It turned out that the module for chip ram was a 16 Mb or 32 Mb, so I decided to replace it by a smaller one because after all only 2 Mb will be used. So I tried some modules that looked like 4 Mb or 8 Mb. Turned out I got only 1 Mb or even 512 K Chip Mem !!! Totally uncool !!! Continued to experiment with other modules and after using a very small module that didn´t seem to have many chips on it, I got my 2 Mb Chip Mem back.
Then I continued to get the Fast Ram to work, but no results. At this moment I have in bank 1 and 2 two identical modules that may be 4 Mb maximum. Now two jumper settings:
-jumper 214 : set to VBB and not to 1 8M
 placed to the upper left of the buster chip
-jumper 852 : set to 256Kx32 and not to 1x32
 placed almost under the daughterboard close to chip mem module
My A4000 has a motherboard Rev B

Any cool advice would be very welcome, especially because of the burning sun outside ...

[Effy]

Morley : I am already trying to do the job with italian red wine ... :-)

Ilwrath : so it could be that the not-2Mb-chip in the chip mem bank causes the other memory banks not to work  :-?  

[Effy]

At the moment those three Simm´s that are placed are all three single sided and probably not bigger than 4 Mb each ... but I shall check on that jumper ...

[Effy]

The pitty side of this A4000 is that is has got superbuster 11 and kick 3.1 ... but maybe I can transfer an 68040/25 from another A4000 to this one and use this when I get it :
X-calibur ... which will allow me to use up to 4x32 Mb Simm´s !! That way there will be no ´slow´ fast memory on the motherboard that may slow the system down  :-)

[Effy]

Acill : I happen to live in Belgium, a little country that you can cross from one side to the other in less then three hours ... trust me, there aren´t many Amiga shops, actually none as far as I know .. it might even be better to search on Ebay ... but thanks anyway for the advice

[Effy]

Lemmink : jumpers were already set that way. I am not talking about 5 memory modules, just two, the chip and one single fast. I´ve got the chip mem working so far, but fast ram does not work yet. And the battery was´t leaking, at least not much ... any other options I know that the A4000 was totally taken apart because the owner first sold his turboboard ... now I added an original 68030/25 board ... and that Xcalibur board I bought on Ebay is not a Z3 memory board but one that adds memory to a 3640 board by having the processor mounted on this card ...

[Effy]

I have tried to set the jumper to 256K and later to 1 Mb to see if there was any difference ... but there wasn´t ...  :-(

[Effy]

The four Simms that I have tried to put into the Fast Ram sockets are :

-SecKMM5364103CK-6            KOREA 9743 H
-TOSHIBA THM321000AS-80       JAPAN 9314AAA
-SMART SMI5321000W-7 446005IN MADE IN USA
-IBM 4M 70ns P  p/n 71F010  FAU 92F0105

I have only tried them one at a time, no combinations so there can not be any conflicts ... seems I need to use the X-calibur after all to expand my memory from 2 Mb Chip to 2 Mb Chip + 128 Mb Fast Ram ...

[Effy]

Lemmink: ehm, I don´t have it yet, I paid for it but there is always the theoretical option that I won´t receive anything ... so meanwhile I try to use whatever I have got ...

[Effy]

Oops  :-o  I thought I had to worry but suddenly it seems I have to worry DOUBLE  :-o   :-o
I decided to leave that A4000 at the end of my desk and take another naked A4000 with all Ram sockets filled, 3630/25 and kick 3.0, no harddrive, only internal floppy and two external floppies ... I booted with Workbench 3.1 floppy and guess what I got : 2 Mb Chip mem and 0 Mb Fast mem  :-o
This is absolutely not funny  :pissed:
So I took my own older A4000 with kick 3.1 and 3640/25 and all Ram sockets filled too, and booted with the same Workbench 3.1 floppy and (lucky for me) it turned out to have the 16 Mb Fast ram ...
Those two A4000´s with no Fast ram have all jumpers set to the same setting, have same turboboard and were booted with the same floppy (workbench 3.1), and have both 2Mb Chip.Now what the f**k have I done wrong  :-?

[Effy]

Ehm  :-? I don´t perfectly understand what you mean. As far as I can see there´s still an orginal power supply of 145 Watt inside the desktop(s). If you mean that I must remove the power plug and put it back on again then I shall try to do that (doesn´t sound so difficult) ...

[Effy]

Daniel_R : I unplugged the power connector from the motherboard, turned the power supply on and off, and plugged the power connector back on.There is only one way to connect it so you can not create fireworks. Result : computer still boots up but still without Fast Mem ...  :pissed:
Theoretical all my spare Simms can be faulty, not very likely, but it is possible. So I took a working Simm from my third Amiga4000 that has 16Mb Fast Ram, and plugged such a working module into an A4000 that refuses to use Fast Ram.Result : still no Fast Mem ...  :pissed: Means that the problem is not the Simm module(s) but the computer itself ...
I tried to set the Rom Speed from 200 to 160 by moving a jumper next to the IDE port ... no difference ...
Anybody any other cool ideas that I don´t know (to be honest, I don´t know that much of A4000´s)