Started by ArcadeTV, 03:27, 28 October 14
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QuoteUnfortunately, there are several practical problems with this circuit. First, most digital logic gates do not accurately produce 0 and +5 volts at their outputs. Therefore, the resulting analog voltages will be close, but not really accurate. In addition, the different input resistors will load the digital circuit outputs differently, which will almost certainly result in different voltages being applied to the summer inputs.
Quote from: Bryce on 11:24, 18 February 16Can you explain exactly how you wired it up. Didi you disconnect the 40464 output pins from the PCB to isolate them from the rest of the circuit? How did you terminate the signals?Bryce.
Quote from: Munchausen on 11:19, 18 February 16Why is it that the outputs of the 40464 (which are also the monitor connectors) are so dark? I wired up an RGBs connector to the 40464 on my GX4000 to bypass most of the video circuitry yesterday and I also have to turn the brightness, contrast and saturation to 100% to see a picture, and it is still quite dark. I can put an amplifier there, but shouldn't they really be enough already? The original 6128/464 machines don't do this, and as far as I understand people are using SCART cables on plus machines without the issue?
Quote from: gerald on 11:47, 18 February 16Some point to not forget :- 40464 output level will be different whether you power the GX4000 with 5V or 12V. With 5V, they will be lower.- The SCART output are buffered- the CM14 monitor has 100 ohm input, a TV or normal monitor usually have 75 ohm input.
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