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Re: LCD screen & analog signal refresh

in Marvin \ Video
It reads like the LCD display is slow to sync on to the changes in video mode? Most digital displays seem to be quite slow at locking on to video modes. I am not sure why that is, but the behavior seems common: most flat panels I are pretty slow at establishing video modes in general, and can take a …

Re: Manual/jumper settings for a 16-bit ISA IO controller UMC UM82C862F for floppy drives?

I have been looking closer into this card, to help debugging some instabilities with audio playback on this system. (see https://www.vogons.org/viewtopic.php?f=62&t=86708 ) One thing that System Information tool shows is the following hardware IRQ assignments: IRQ3 COM2 BIOS IRQ4 MOUSE CTMOUSE IRQ5 …

Special locksmiths or similar who might be able to source new keys for those ancient keyboard locks in XT PC cases?

Hi all, just a random question: I wonder if there are any known ways to get new keys for the XT PC keyboard locks in the chassis? Talking about e.g. these: https://www.pinterest.com/pin/477803841700094119/ See also https://www.youtube.com/watch?v=y0zZqHOZq7M for background. Or maybe new key+lock …

Re: The quest for best potentiometer for PC speaker volume knob turned out not 100% perfect :(

Ok, that helps. So how much does anyone trust that the 33ohm current limiting resistor shown in the 5160 schematic actually exists? If it exists then it shouldn't matter if pin 1 (signal) is shorted to pin 4 (+5V). Connect header pin 4 (+5V) to pot left and to speaker +. Connect speaker- to pot …

Re: The quest for best potentiometer for PC speaker volume knob turned out not 100% perfect :(

I'm curious how you're connecting yours up here, have you got any photos/diagrams showing what's connected where? Sure - I followed the original wiring, which connected two legs of the pot in series. Attached illustrations of the old and new wiring. The XT speaker header (from a schematic) was 1- …

Re: The quest for best potentiometer for PC speaker volume knob turned out not 100% perfect :(

10K sounded too high to me for audio volume, most stuff I've seen it would be 1-5K... I wonder if it's not original even, so the part you found in there never "worked perfect" but was a "I'll just stick this in because it's what I've got kicking around". I think you are right there - looking at the …

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