So this is what the circuit actually does! First, here are VGA/EGA pinout references: You might even find one on your local craigslist. You can pick this model of monitor on ebay for under $40 shipped. Turns out, it also handles EGA's frequencies just fine! Please note that not every newer "multisync" branded monitor actually can support this. It's a standard vga/dvi monitor but does a good job of accepting a wide range of frequencies, such as the 15/24khz seen in Japanese retro PCs. My circuit does not fix this part - However, I already owned a NEC MultiSync 1970NX, a somewhat cheap LCD monitor from the early 2000s. Horizontal frequency mismatch (EGA scans at 15.7 and 21.8, VGA is 31.4) In EGA to VGA conversion there are basically there are two problems to solve:ฤก. Let me note there are "EGA to VGA" converters all over the place on ebay but my understanding is they don't actually work for 21.8khz EGA frequencies and are more meant for certain arcade cabinets. It wasn't very hard and I'm personally not great with electronics/hardware yet I was able to do it anyway. I ended up building an EGA to VGA adapter. I wanted to have support for an external display without purchasing an expensive EGA monitor. I have a IBM 5155 PC with the ATI EGA Wonder driving an EGA signal to the internal monitor. Hey all, I think EGA is a subject most relevant to early PCs and clones so I thought it most appropriate to post here.
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