Re: CBM720 heads up

From: A. Fachat <>
Date: Sun, 26 Oct 2014 21:34:55 +0100
Message-ID: <1758030.561fpt8vsL@euler>
On Wednesday 22 October 2014 10:58:22 you wrote:
> The irq is working correctly ?
> in the pre-series 720 I used, the irq was coming from the power supply
> when we received it, the 720 was not working
> a chip was blown, this chip was used to generate the irq
> from the power line frequency
> (was fixed by generating the irq from another source)
> symptomes:  no keyboard, no cursor

Yes, I didn't even try it without the 50Hz signal coming from the power 
supply. I created a small 555-based circuit to generate it and feed it into 
the power supply connector.


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Received on 2014-10-26 21:01:02

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