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Author Topic: PC Engine Duo white screen  (Read 1630 times)

thesteve

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Re: PC Engine Duo white screen
« Reply #15 on: March 27, 2015, 09:07:15 AM »
next step is check if everything is getting power
a quick walk across the card slot pins with a logic probe will often find the issue
some games will have sound as long as the W-RAM CPU and data bus is good, so try several games
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Ergot_Cholera

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Re: PC Engine Duo white screen
« Reply #16 on: March 28, 2015, 01:51:21 AM »
I don't even know what logic is (I do in the literal sense, just not in digital). :-({|=
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thesteve

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Re: PC Engine Duo white screen
« Reply #17 on: March 28, 2015, 06:40:24 AM »
logic is simply pulses between VCC 5V and ground
a good connection will always be pulled high, pulled low or pulsed
anytime you dont have 1 of the 3 conditions on a data or address pin it means you have a broken connection
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