Started by gw0udm, 01:28, 07 July 21
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Quote from: Bryce on 10:57, 07 July 21Without hearing it, it's very difficult to guess what it could be.Bryce.
Quote from: Bryce on 00:46, 08 July 21That's painful! Probably a dodgy AY.Bryce.
Quote from: darkhalf on 10:56, 14 July 21Don't get the A version from Microchip. I got a CPC464 with dead row of keyboard inputs. Was unsure about the China eBay ones so got one from Amigastore. The input voltages are slightly different to the GE version. Result is a bunch of random characters following key pressesI've got one from eBay USA seller with GE on its way nowhttps://www.ebay.com/itm/294034880267
Quote from: Bryce on 11:03, 14 July 21It's not the input voltages that are different, rather the fact that one version has internal pull-up resistors and the other one doesn't.Bryce.
Quote from: SerErris on 19:57, 24 March 22I cannot see how solderjoints would result in that problem.One channel of the three is playing correctly .. So that means all the inputs are correct (including clock address and data lines). Also the keyboard works, so the IO pins are also working correctly. The output lines are then the only ones in questions that might have solder joint issues ... I also would suspect that two of the three voices are broken in the chip.I have created a small basic program that you can try to identify what is wrong.It plays simple sounds test on each channel,Noise test on each channelVolume Envelope teston each channelTone Envelope test on each channel
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