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[amigadave]

Is the RED clip w/wire still required to be connected to pin 21 of CIA chip in the A3000T like it is in the A3000D?

Since the CIA chips are located at different locations in the A3000T motherboard than the A3000D motherboard, how do I know which CIA chip is the correct one to attach to that will be the same as the one at U350 on the A3000D motherboard?

Anyone here that can solve my puzzle?

[Jeff]

I still have a manual for the Warp Engine even though I don't have the card anymore. I'll check it and see if it has any info for you.

-Jeff

[EDIT] Sorry the manual I have only covers installation in the A4000:-(

[amigadave]

Thanks for checking, but my manual only covers the A4000D and has an addendum for the A3000D in the back two pages. Yours is probably the same.

[matthey]

I'm not 100% sure but I believe the wire would be required unless you have done the int2 mod...

http://amiga.serveftp.net/A3000_INT2_mod.html

The int2 mod above worked for my 3000T. Most, if not all 3000T's need the int2 mod done or the Warpengine CIA wire for SCSI.

[amigadave]

matthey wrote:
I'm not 100% sure but I believe the wire would be required unless you have done the int2 mod...

http://amiga.serveftp.net/A3000_INT2_mod.html

The int2 mod above worked for my 3000T. Most, if not all 3000T's need the int2 mod done or the Warpengine CIA wire for SCSI.

Thanks, I also looked for other information online and found that I need the wire connected and the chip identification is the same in the A3000T. I don't know if the previous owner did the Int2 fix on this A3000T, so I will connect the wire. I am looking for a diagram that shows me where pin 1 (and pin 21) are on the A3000T mobo, but haven't found it yet. Does anyone here know if pin 21 is at the top and towards the front of the A3000T? I mean the front most pin that is on the top side of the chip when the A3000T is standing upright. That is my guesstimate.

[amigadave]

Difficult to put the jumper wire clip on the CIA chip's pin21 without completely tearing the A3000T apart, but I got it on and turned the A3000T on. Hooray! It booted to my RetinaZ3 Workbench screen. Boooo! The mouse pointer would not move.

2nd try, I disconnect the jumper wire and try to boot without it connected. Boooo again! It does not even try to boot and no HD activity is seen, can't even get to the early bootup screen (but maybe the mouse is not functional still).

3rd try, finally get the jumper wire clip attached again, in the opposite direction to be more sure that it is not touching more than the one pin it is intended to be attached to. Boooo again! Now it does not attempt to boot and again no HD activity. Damn! At least the first attempt got further than this.

4th try, I disconnect the SCSI cable from the onboard controller and both devices (hd & CDROM) and attach it to the WarpEngine SCSI-II controller.

Still no joy!

Oh well, tomorrow is another day of Amiga tweaking. I hope it will boot from a floppy.

[rkauer]

No A3000 (D or T) works without a SCSI device attached! Try to boot it at least with a terminator in the SCSI connector.

To pinpoint the position of a chip, just follow the marker on the side of the chip with no legs: there is an indentation or a small dot. Then count the pins in counter-clock way. Pin 1 is the first pin under the mark (or next to it, in the indentation mark case).

Look in this eventual chip image, it is more easy to understand than what I said:

[x56h34]

Useful facts which might help you out.

Some A3000T units came with int2 already installed at the factory so you might not need it at all.

Some A3000T units also do not come with an IC chip which is required in order for accelerator cards to work stable. It's a 14-pin gate array chip made by various different manufacturers. The one that I've got in my A3000T is GD74LS08. Look at this picture and see the empty socket close to the accelerator slot to understand what I'm talking about. Does your socket have a chip in it?

[x56h34]

rkauer wrote:
No A3000 (D or T) works without a SCSI device attached! Try to boot it at least with a terminator in the SCSI connector.

This is not true. If no SCSI devices are attached, both A3000D and T should display the kickstart insert disk screen.

They might not boot if your SCSI chain if not configured or terminated properly though.

[matthey]

x56h34 wrote:
Some A3000T units came with int2 already installed at the factory so you might not need it at all.

Did your 3000T come with the int2 mod? I hear that some came with the int2 mod but I never have heard from someone that had one.

Some A3000T units also do not come with an IC chip which is required in order for accelerator cards to work stable. It's a 14-pin gate array chip made by various different manufacturers. The one that I've got in my A3000T is GD74LS08. Look at this picture and see the empty socket close to the accelerator slot to understand what I'm talking about. Does your socket have a chip in it?

Are you referring to U103? What does it do? I have used a 3640 and CSMK3 in my machine without it. The only problem I have is with the newest Ramsey and DMAC causing SCSI problems with certain accelerators like the CSMK3.

[x56h34]

matthey wrote:

Did your 3000T come with the int2 mod? I hear that some came with the int2 mod but I never have heard from someone that had one.

Yes, it came with the INT2. The underside of the motherboard does not have the patch wire installed, and when I install an accelerator in the cpu fast slot such as CSPPC for example I can boot off of its scsi controller and see cybppc.device in HDToolBox including all drives attached to its chain. This can only mean that INT2 is already there.

Are you referring to U103? What does it do? I have used a 3640 and CSMK3 in my machine without it. The only problem I have is with the newest Ramsey and DMAC causing SCSI problems with certain accelerators like the CSMK3.

I believe that it "somehow" adds stability to the system when an accelerator card is installed. If you search old usenet posts about U103, I am sure that you will find a more detailed explanation. I can't remember exactly why it was left out by Commodore originally, but probably to save costs as in those days they must have thought that very few people will actually need an accelerator card in the A3000T.

edit:

Here is one link that I've googled that makes a reference to it. Click here.