Martin's Acorn Atom (poorly)

discussion of games, software, hardware & emulators relating to the Acorn Atom
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Multiwizard
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Re: Martin's Acorn Atom (poorly)

Postby Multiwizard » Mon Aug 07, 2017 9:03 am

Last year I had a few of those too... :-(


Greetings, Wim... :-)
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martinw
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Re: Martin's Acorn Atom (poorly)

Postby martinw » Mon Aug 07, 2017 9:12 am

Multiwizard wrote:Last year I had a few of those too... :-(


Greetings, Wim... :-)


Further interest, I'm liking this thread, I'm learning so much :D

Martin

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1024MAK
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Re: Martin's Acorn Atom (poorly)

Postby 1024MAK » Mon Aug 07, 2017 10:28 am

Beware of waking up the hardware geeks...Image

Mark
For a "Complete BBC Games Archive" visit www.bbcmicro.co.uk NOW!
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martinw
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Re: Martin's Acorn Atom (poorly)

Postby martinw » Mon Aug 07, 2017 11:12 am

1024MAK wrote:Beware of waking up the hardware geeks...Image

Mark


:lol:

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1024MAK
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Re: Martin's Acorn Atom (poorly)

Postby 1024MAK » Mon Aug 07, 2017 11:24 am

BigEd wrote:I'm reminded of a recent post on Dave Curran's blog, where he finds a couple of logic TTL are failing to meet timing - but still pass a logic test. Some old chips are evidently past their useful life (whereas most are still fine.)

One thing to keep in mind with 74 series logic chips, is that only the logic function is the same between different manufacturers. How the chip does what it does is entirely down to the designer. So different chips with the same base number and function could (and do) use completely different internal circuitry. Worse, as some semiconductor manufacturers have bought up other semiconductor companies, sometimes they retain their original design and sometimes they use the design of the company that they bought...
Oh, and don't rely on any internal circuit schematic in data sheets. These are normally only "representative" of how it could have been done, not necessarily the actual circuitry used.

Normally this is not a problem, but sometimes chips with the same base number and logic function from different manufacturers cause problems in real world circuits. With a brand new chip from one manufacturer working fine, and another brand new chip from another manufacturer preventing the system from working :twisted:
Both Acorn and Sinclair encountered this problem...

Also note that some manufacturers revise designs over time, so the specification of older logic chips may no longer meet the specifications in current data sheets...

Mark
For a "Complete BBC Games Archive" visit www.bbcmicro.co.uk NOW!
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jonb
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Re: Martin's Acorn Atom (poorly)

Postby jonb » Mon Aug 07, 2017 1:42 pm

1024MAK wrote:Beware of waking up the hardware geeks...Image

Mark


(yawns)

"Who's been eating MY porridge???"

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jonb
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Re: Martin's Acorn Atom (poorly)

Postby jonb » Mon Aug 07, 2017 1:43 pm

@Mark: Especially propagation times!

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martinw
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Re: Martin's Acorn Atom (poorly)

Postby martinw » Thu Aug 17, 2017 7:48 pm

I was having problems with my Atom overheating (since it's been fixed) until I installed this ...

IMG_5295.JPG

IMG_5294.JPG


Cheers Phill, no problems now =D>

Charlie too for the MMC2 =D>

Martin

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oss003
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Re: Martin's Acorn Atom (poorly)

Postby oss003 » Thu Aug 17, 2017 9:09 pm

You can still save some heat by replacing the video 2114's with an 8 kB RAM.

Greetings
Kees
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martinw
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Re: Martin's Acorn Atom (poorly)

Postby martinw » Fri Aug 18, 2017 6:19 am

That's a great idea Kees, thank you :)

Martin


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