1040STE - Cold state issues

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JG53_Jaguar
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1040STE - Cold state issues

Postby JG53_Jaguar » Thu Nov 23, 2017 1:39 pm

Hi All,

In 2000, I was given to me by a musician friend 1040 STE (4MB). The machine is in pristine condition as it wasn't used that much. I had it in my closet for 17 ears now. I haven taken it out few times but just to play with it for an hour or so. In October this year, I have decided to have some real fun with the computer, I want to learn 68000 assembly - just for a fun and play some old games like Battle of Britain, Xenon 2 etc. I bought ultrasatan (great piece of hardware) and I'm really enjoying myself.

However, since October i'm having some issues with the STE. When the machine is cold and say in the morning I turn it on for the first time, as the machine goes through the TOS mem test (TOS 2.06 installed), quite a few mem blocks are showing "x" rather than the usual "-". See attached picture for details. Once the test is finished, TOS boots up to the desktop it locks up and displays 4 bombs. I let the computer stay like this for say about 5 minutes then I simply reset the machine/power off/on and the mem test passes nicely and I can use the machine whole day no problem.

Considering that the machine is 26 years old, it could be anything. The first thing I did was to open the computer and took a look at the motherboard (I didn't take the motherboard completely out) and it looks in great condition...like new. I figured it could be the old PSU, so I bought a new one from exxoshost.co.uk and installed it. The PSU upgrade needed to be replaced anyway, its running great but it didn't fix the problem. So now, I checked the 4MB mem simms...contacts are clean, I also took out the M68000 out of its socket and put it back in... it didn't solve the problem. I'm not an electrician, even though I was able to replace/solder the new PSU into the computer myself. I'm at a loss right now thinking about what could be the problem, it has to be temperature related...maybe a cold contact on the motherboard somewhere ? Old solder that is cold state is failing, once the computer is warm the bad solder is not causing problems anymore. My father is an electrician but before we take the motherboard out and start checking every single solder I would like to kindly ask for your help, if you have seen this kind of issue with ST before.

thanks!

OPPS, sorry looks like triple post...I'm sorry (I was getting HTTP error 500 when I was posting this)
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grobda
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Re: 1040STE - Cold state issues

Postby grobda » Thu Nov 23, 2017 2:36 pm

could be a failing ram chip. iirc you can run a ste with 2mb ram using slots 1 and 3. if you then swap simms around it should let you identify if you have a bad simm.

JG53_Jaguar
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Re: 1040STE - Cold state issues

Postby JG53_Jaguar » Thu Nov 23, 2017 2:54 pm

grobda wrote:could be a failing ram chip. iirc you can run a ste with 2mb ram using slots 1 and 3. if you then swap simms around it should let you identify if you have a bad simm.


It could be they are 26 years old after all, I have 4 simms (see picture attached); I have taken them out and took a close look and put them back in different order. One thing I still need to do just take one simm stick and test the computer this way, 1MB at the time and see if it makes a difference.

In addition, I did order new STE 4MB simms from exxoshost.co.uk, lets see if they make a difference.
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grobda
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Re: 1040STE - Cold state issues

Postby grobda » Fri Nov 24, 2017 11:08 am

One thing I still need to do just take one simm stick and test the computer this way, 1MB at the time and see if it makes a difference.


You can't test simms on an ST one at a time due to the way it banks its memory - one simm is only half a bank of memory.

You have to use them in pairs (it just wont boot using one).

JG53_Jaguar
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Re: 1040STE - Cold state issues

Postby JG53_Jaguar » Sat Nov 25, 2017 1:23 pm

grobda wrote:
One thing I still need to do just take one simm stick and test the computer this way, 1MB at the time and see if it makes a difference.


You can't test simms on an ST one at a time due to the way it banks its memory - one simm is only half a bank of memory.

You have to use them in pairs (it just wont boot using one).


Thank you grobda for pointing that out, I didn't know that!


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