Author Topic: cpc 464 motherboard power requirement ?  (Read 451 times)

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Offline retro_4_ever

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cpc 464 motherboard power requirement ?
« on: 19:31, 01 September 20 »
can you power the motherboard direct without the tape deck circuit by inserting 5 volt to the output pin of the tape connector or do all those capacitors etc have some relevance for the power line to the motherboard .... if this is possible what sort of circuit would be required to feed a suitable audio signal to the audio ouput pin  to load software .. ?   

Online Bryce

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Re: cpc 464 motherboard power requirement ?
« Reply #1 on: 19:52, 01 September 20 »
You can power the 464 from the normal power socket by just shorting pins 1 and 3 on the tape deck socket to power the CPC without the tapedeck connected.

Bryce.

Offline Liartes

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Re: cpc 464 motherboard power requirement ?
« Reply #2 on: 21:42, 01 September 20 »
VintageAdvantage has post a convenient picture showing which pin you must connect to bypass the tape deck, see this thread https://www.cpcwiki.eu/forum/hardware-related/cpc-464-suddenly-not-powering-up/

Offline retro_4_ever

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Re: cpc 464 motherboard power requirement ?
« Reply #3 on: 17:43, 03 September 20 »
seems crazy that there is no power regulation / filtering ..guess this is why my cheap Chinese switching power supplies give off screen interference..  thinking about making a mini cpc with a audio input and no tape deck at all .. ** i wont be destroying a good example it will be one that is in very poor shape..

Online Bryce

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Re: cpc 464 motherboard power requirement ?
« Reply #4 on: 19:49, 03 September 20 »
seems crazy that there is no power regulation / filtering ..guess this is why my cheap Chinese switching power supplies give off screen interference..  thinking about making a mini cpc with a audio input and no tape deck at all .. ** i wont be destroying a good example it will be one that is in very poor shape..

The computer was designed to be used with the Amstrad monitor, where all the regulation occurs. It would have been better to put the regulation in the computer, but they decided otherwise.

Bryce.

Offline gerald

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Re: cpc 464 motherboard power requirement ?
« Reply #5 on: 21:53, 03 September 20 »
The computer was designed to be used with the Amstrad monitor, where all the regulation occurs. It would have been better to put the regulation in the computer, but they decided otherwise.

Bryce.
They mainly decided to put the heating elements in the monitor rather than in the computer, like with the pc1512, which is not such a bad idea.
The bad idea is to buy the cheapest supply from china and risk your 35years old computer life with it !



Offline retro_4_ever

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Re: cpc 464 motherboard power requirement ?
« Reply #6 on: 23:45, 03 September 20 »
cheap power supplies from china VS 35 year old unregulated technology ... probably  on par with each over !

Offline gerald

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Re: cpc 464 motherboard power requirement ?
« Reply #7 on: 19:31, 04 September 20 »
cheap power supplies from china VS 35 year old unregulated technology ... probably  on par with each over !
No, you did not get it. The monitor includes a regulated supply dedicated to the CPC and the monitor is part of the CPC.
 So there is no point in having a regulator in the CPC.
What's amazing is that 35 years later, you can still find so called regulated (yes switching is supposed to be regulated) supply on the market that are only good for powering a regulator ....

Sorry to tell you : you got what you paid for.

Offline retro_4_ever

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Re: cpc 464 motherboard power requirement ?
« Reply #8 on: 19:51, 04 September 20 »
well ive never seen a cpc monitor close up... well thats a lie i spent my younger years in dixons/boots etc messing with the computers..and its only 35 years later that i could afford a amstrad cpc .. we had spectrums   :) :) :)   ...