Problem with Amiga 3000T , Please help !

[nscaleworld]

I have an Amiga 3000T that has a couple of problems. First, I can not boot from any disk unless I first hold down both mouse buttons and then turn cpu cach off. Only after turning off the cpu cach will the Amiga 3000T boot from a disk. Second, I can not get the computer to recognize any SCSI hard drive. I can load up HDTools and low level format, partition, and verify a hard drive, but after I reboot, the hard drive does not show up in Workbench 3.1. The harddrive does not even show up in the list on the WB 3.1 Install disk.

Here are the specs of my Amiga 3000T:

030 processor on motherboard
2 megs chip memory
16 megs fast memory
Rev 08 WD SCSI chip
Kickstart 3.1 roms
880K Amiga 3000 disk drive (DF0)
1.76 MB Amiga 3000 disk drive (DF1)
Newer Ramsey and Demac chips

I am really scratching my head on this problem.

PS: Battery was removed and the motherboard is clean, almost new.

[magnetic]

Hey buddy are you going to ridicule people trying to help you here like @ eab? Are you going to put the batt in to make scsi work?

[TheBilgeRat]

I think its beyond hope - you should send it to me for a reasonable price.

[nikos.rizos]

Have you changed the caps on the motherboard? I remember I had a similar issue with a 4000D and some caps needed to be replaced along with an IC.

[magnetic]

Well he doesnt believe me that the A3000T SCSI NVRam settings are stored on the batt. He doesnt have one installed. This could be a solution.

[Tahoe]

Well he doesnt believe me that the A3000T SCSI NVRam settings are stored on the batt. He doesnt have one installed. This could be a solution.

No it isn't. NVRAM setting are only needed if you use a slow spin up SCSI drive on COLD boot (a reset will help), a CD changer that uses LUN ID's or if you ignorantly use a SCSI ID 7 for a device and need to set a different ID for your controller.

Any 3000(T) will work perfectly fine with default settings in 99.997% of the cases.

[nscaleworld]

Have you changed the caps on the motherboard? I remember I had a similar issue with a 4000D and some caps needed to be replaced along with an IC.

The caps on the Amiga 4000 are smt, the caps on the Amiga 3000T are higher quality thru-hole.  I will be replacing all of the caps with new Nichicon caps from Japan.

[nscaleworld]

So, again, here are the problems:
 
Amiga 3000T will not boot an 880k disk unless I first disable cpu cach.
 
Amiga 3000T will not recognize a hard drive after reboot.
 
Do any of you know what the default jumper settings are for an Amiga 3000T with onboard 68030, I need the default for all of the jumpers on the motherboard.
 
Thank you.
 
Oh, and as far as the battery is concerned, I know that Amiga computers work just fine without a battery, but, I do plan on installing a CR2032 battery holder and diode, because I plan to install Workbench 3.9 and I want the correct date and time displayed.  Do any of you know what diode I should use?  Will a 1N4001 diode work?

[mdivancic]

So, again, here are the problems:
 
Amiga 3000T will not boot an 880k disk unless I first disable cpu cach.
 
Amiga 3000T will not recognize a hard drive after reboot.
 
Do any of you know what the default jumper settings are for an Amiga 3000T with onboard 68030, I need the default for all of the jumpers on the motherboard.
 
Thank you.
 
Oh, and as far as the battery is concerned, I know that Amiga computers work just fine without a battery, but, I do plan on installing a CR2032 battery holder and diode, because I plan to install Workbench 3.9 and I want the correct date and time displayed.  Do any of you know what diode I should use?  Will a 1N4001 diode work?

http://www.l8r.net/technical/t-3000-jumpers.shtml

Spend some time on Google, there's a lot out there...

[mdivancic]

...another thought, check your SCSI termination. I believe there are, or should  term resistors on the motherboard (but I haven't seen a A3000 in years).

[nscaleworld]

http://www.l8r.net/technical/t-3000-jumpers.shtml
 
Spend some time on Google, there's a lot out there...

This information, as far as the jumpers, is basicly useless, because it does not tell you what the working default set by Commodore is.  What I really need is for someone that has an Amiga 3000T, that they have never messed with the jumpers, to pull the cover off and write down what the jumper settings are for all of the jumpers.  Or take a few pictures of the jumpers, showing how they were setup by Commodore.  This would help a lot.
 
Also, why would 880k disks refuse to boot unless you first hold down both mouse buttons and turn off cpu cashe?  I have never seen this problem on any Amiga computer.  It's got me scratching my head trying to figure it out.

[nscaleworld]

...another thought, check your SCSI termination. I believe there are, or should term resistors on the motherboard (but I haven't seen a A3000 in years).

I only have the one 249 mb Seagate hard drive installed.  It is terminated and is set for SCSI ID 0.  The terminator resistor packs on the motherboard were removed and a Commodore terminator is plugged into the 25-pin SCSI port.  I tried 3 different SCSI ribbon cables, does not fix problem with hard drive not showing up in Workbench 3.1.  The ribbon cables are about 6 FEET long.  I wonder if they are too long.

[Tahoe]

The CPU Cache thing makes you wonder if the CPU itself is 100%. Do you have a 3640 to test with?
Also, what Kick 3.1 are you using? Original or burned? Do you have a set of 2.04 ROM's to use?

[nscaleworld]

The CPU Cache thing makes you wonder if the CPU itself is 100%. Do you have a 3640 to test with?
Also, what Kick 3.1 are you using? Original or burned? Do you have a set of 2.04 ROM's to use?

Yes, I do have an A3640 board, but, it is a revision 3.0.
 
The Kiskstart 3.1 roms appear to be original, but, I am not sure.  How can you tell if they are burned (copies)?

[Pentad]

Well he doesnt believe me that the A3000T SCSI NVRam settings are stored on the batt. He doesnt have one installed. This could be a solution.

Well, I don't believe you either.  C'mon, stored on the batt?  That Amiga 3000T used a standard -for the time- rechargeable "barrel" battery.  It has no circuitry for anything like NVRam.  

Now, if you mean powers the NVRam, sure, but that is entirely different.

-P