A3000 Hardware Test Program Needed

[Framiga]

by N7VQM on 2003/8/16 7:23:14

Quote:

smerf wrote:
Remember that the Amiga's rom is powered from battery on startup,

You'll have to show me where you get this from because it doesn't make sense. There is no reason I can see for this to be true.

Never heard before too!! it should be a "nonsense" and unusefull behaviour!

Ciao

[N7VQM]

Framiga wrote:

Never heard before too!! it should be a "nonsense" and unusefull behaviour!

Just to check my reasoning, I located my A3k schematics, C= P/N 314677-01.  The clock and ROM chips are on sheet 3.  It clearly show that the battery never powers the ROM.  In fact, unless D191 were to fail, no current could flow from the battery to the 5V rail.

[N7VQM]

MrZammler wrote:
When I first installed my Cyberstorm, my NetBSD installation refused to boot.

My A3k wouldn't get past the CLI with memory on the motherboard and memory on the CSPPC.  Booting with no s-s, I ran avail and it reported something like 2.5GB of free RAM.  Perhaps the CSPPC maps something to the range the mobo RAM normally occupies.

[Framiga]

by N7VQM on 2003/8/16 16:44:11

Quote:

Framiga wrote:

Never heard before too!! it should be a "nonsense" and unusefull behaviour!

Just to check my reasoning, I located my A3k schematics, C= P/N 314677-01. The clock and ROM chips are on sheet 3. It clearly show that the battery never powers the ROM. In fact, unless D191 were to fail, no current could flow from the battery to the 5V rail.

i haven't direct experience about A3K.

Has tha A3K, a rechargeable battery? like the A4K has?

Can you post me the related schematics part?

cieffeeditingvideo@tin.it

Thanx
 

[98PaceCar]

I've made a bit of a discovery about my random guru problem. I pulled all of the fast ram out and started running burn in loops. It's working like a champ! So I decided to clean the legs on all the zips I pulled out. While I was doing that, I decided to check the numbers on them to make sure they are what they are supposed to be. Turns out I have 8 HM514400AZ8 chips and 8 HM514402AZ8. Half static and half page. I've been reading ont he net and I've seen both sides of the story.. either mix them with the page mode zips in the first bank or don't mix them. Can anyone shed any light on this discussion?

I'm going to slap half of them back in and see what happens, then probably the other half after I'm happy that the first set is working. I hate to scarifice half of my fast ram, but I guess if it gets me stability it's worth it!

TIA,
98PaceCar

[98PaceCar]

Also noticed that jumber 851 (ram speed) is set to 16 as opposed to 25. I can't imagine that would hurt anything, but it is a 25 mhz system, so wouldn't 25 be the appropriate setting?

Thx,
98PaceCar

[GPT]

That thing about ram mixture is offent for the pc.
The most cards on amiga don't care if it's mixed or not.

I said most so I can be wrong.

[Framiga]

If you have a 25 Mhz CPU, set the JUMPER to 25.

Ciao

[98PaceCar]

Framiga,

That's what I thought! I went ahead and switched it over, put all the ram back in (page mode chips in the first bank and static mode in the second bank), and fired up the burn in. It's been through 4 loops so far and is working great! It was crashing during the first loop before, so it's a great improvement.

Thanks for the advice!
98PaceCar

[Castellen]

Sounds likely that intermittent joints in the device sockets have been causing most of your problems, I see that a lot with A3000s I work on.
Removing/reseating all socketed devices on the motherboard often fixes random crashing faults.

As for the memory type, probably not a big deal as the other guys have mentioned.  As each ZIP is 8 bits wide, and A3000 fast mem is 32 bits wide, it uses 4 ZIPs in parallel (4x8) to give you 1Mb at 32 bits.
Therefore, if mixing memory types, try to keep the like ZIPs in the same group of 4.


Framiga: if you want A3000 schematics, grab some off my webserver:
http://amiga.serveftp.net

They're a bit crap, but I hope to have some better ones up there shortly.

The A3000 does have a Ni-Cad battery the same as the A4000, which ONLY powers the real time clock, same as the A4000.


Anthony.