Atom Hardware Advice Needed

discussion of games, software, hardware & emulators relating to the Acorn Atom
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1024MAK
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Re: Atom Hardware Advice Needed

Post by 1024MAK » Fri Aug 31, 2018 5:02 pm

Do you still get the problem if you hold BREAK down for at least one second before letting go of the key?

Mark
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AndyGarton
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Re: Atom Hardware Advice Needed

Post by AndyGarton » Fri Aug 31, 2018 5:29 pm

That doesn't seem to make any difference.

I just got home today, so machine was cold - I powered on, worked fine, did a few seconds of typing, pressed break for a long time, keyboard was dead. Powered off and on again, keyboard still dead - total on time was still less than a minute, so I assume now that heat isn't really the issue, it's just a random power on/reset issue, as Dave supposed above.

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Re: Atom Hardware Advice Needed

Post by AndyGarton » Fri Aug 31, 2018 5:37 pm

Is it therefore a good stab to replace the 8255? If so, could somebody advise exactly what I'm looking for on eBay (or wherever) please? I see for example:

https://www.ebay.co.uk/itm/D8255AC-5-NE ... Sw4P5alrbS

... would that do it?

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hoglet
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Re: Atom Hardware Advice Needed

Post by hoglet » Fri Aug 31, 2018 5:49 pm

AndyGarton wrote:
Fri Aug 31, 2018 5:37 pm
... would that do it?
It's very likely to be fake/remarked, especially as it's advertised as new.

That doesn't mean it won't work though.

If you are happy to risk the £6.00...

Dave
Last edited by hoglet on Fri Aug 31, 2018 5:50 pm, edited 1 time in total.

AndyGarton
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Re: Atom Hardware Advice Needed

Post by AndyGarton » Fri Aug 31, 2018 6:17 pm

I can afford the six quid, but less so the potentially wasted time! Are there any better options please? Is this a reasonable thing to try to fix it in the first place?

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DutchAcorn
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Re: Atom Hardware Advice Needed

Post by DutchAcorn » Fri Aug 31, 2018 9:11 pm

Just a thought; the Atom did not work before you reseated the socketed chips and the symptoms sound more like an intermittant connection than a failing chip; is it worth a try cleaning the legs of the chips? A little corrosion can mess things up, especially with those “authentic” white sockets.
Paul

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Re: Atom Hardware Advice Needed

Post by AndyGarton » Fri Aug 31, 2018 9:54 pm

Yes I could try that, although tonight I did try re-seating it a few times, and the legs looked ok actually (better than some others!).

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Re: Atom Hardware Advice Needed

Post by roland » Sat Sep 01, 2018 6:52 am

when you are cleaning the legs of the 2114's, just put back only the zero page (ic 51 and 52) and the video memory at #8000-#8200 (ic 42 and 43). Try if this minimal Atom works fine. In this configuration you have only 2 k of ram so you cannot run large or graphical programmes.

If this works, start adding 2114's in pairs of two until it stops working.

And check the voltage on each ic, it should be at least 4.75V otherwise the Atom might behave unpredictable.
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Re: Atom Hardware Advice Needed

Post by AndyGarton » Sat Sep 01, 2018 8:26 am

Ok, thanks Roland.

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