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It sounds funny to be worrying about a 2040 or 2042 date problem, but the worries about 2020 and 2000 problems also sounded silly 20-40 years ago. If 68kMLA is still around in 2040, then we can look back on this thread and chuckle. Who's taking bets on the average selling price of a working...

Woah, great job hunting down that detail! If that's the issue, then I don't understand how the PCB could work at all with the wrong connections on those signals. I will await the full report and I hope that this video glitching mystery is solved. Very interesting stuff.

Does the Mac show a floppy disk with an X through it, even when no disk is inserted? If so, it thinks a disk has been inserted, which is why the drive is spinning. There's a mechanical switch near the front of the disk slot, it has a small plastic nub that gets pushed down when a disk is...

I can't recall seeing a working Macintosh SE sell for as little as $50 any time recently. On my local Craigslist (SF Bay Area), there are two SE systems listed at the moment. One is a working SE (not FDHD) with Zulu SCSI for $300 asking price. A keyboard and mouse are $50 extra if you want them...

Maybe the CRT had a substantial amount of visible burn-in?

I'll be contrarian and say you folks are all living in la-la land. $225 is a little bit on the high side, but not totally unreasonable given that it also includes a keyboard and mouse, and the CRT, HD, and floppy have all been serviced/replaced. A working ADB keyboard and ADB mouse by themselves...

The hardware is beginning to take shape in my mind, in a way I'm pretty happy with. After more tinkering I discovered that the adapter keeps functioning when the phantom-powered voltage is as low as 2.75V, and maybe it can go even lower. So I feel comfortable with the idea that the...

Well, I guess that question is answered. It's not going to be viable to expect users to select different resolutions from the Monitors control panel if the monitor sense ID isn't one that would normally support those resolutions. So the VGA adapter really does need to generate all those...

It may have been http://macintoshgarden.org/apps/switchres

Yes it wouldn't be particularly useful on the IIci, I'm just trying to understand the behavior so I can decide how important it is for my adapter to support all the different monitor sense ID codes explicitly versus just letting the user pick a resolution in the control panel. This is the only...

I tried holding holding down the Option key while clicking the "Options..." button in the Monitors control panel, while using a VGA adapter configured to appear as a 13-inch 640x480 monitor: Mac IIci with system 6.0.8: No resolution picker is shown. There's an option for "use special gamma" and...

If your monitor doesn't support composite sync or sync-on-green, then it doesn't matter which VGA adapter you use - unfortunately it's not going to work. You would need to try a different monitor. I've been working on a design for a VGA adapter with an integrated sync splitter, which might...

But sir, it clearly says ready for PowerPC upgrade!

20 posts and nobody has tried jamming the Classic ROMs in there yet? If I had an SE, I'd try it. Maybe you could also test it with MAME.

Yes configurations 2-4 are addressed by existing adapters, but this adapter wants to cover those cases too. The goal is that you can use this adapter basically anywhere, except maybe not for less common video modes like 512x384 and 640x870 if I reduce the number of DIP switches. I did a bit...

Check EveryMac specs for early to mid 1990s Mac models and video cards. None of them have 800x600. If you have a PowerPC or iMac then you're light years ahead of the audience that this adapter is targeting, and you don't need this. I think I've found the cause of the shimmering on that one...

800x600 is a PC video resolution, not Mac, so I think it would be handled by setting the monitor ID to multisync. None of the computers or video cards that are stuck with composite sync can output 800x600 anyway, but if you also wanted to use this adapter with other computers then it might be...

If you wanted to steal power from another port, ADB would be a good candidate. I just don't like the concept for this purpose, though. There's a time and place for a more powerful and more capable external video processor, but this isn't that. Mostly I just want something I can plug into my IIci...

This photo shows the dizzying number of video settings possible with a 10-switch adapter, with the ones I actually care about highlighted: Not with this approach. This is a K.I.S.S. design and is purely a sync adapter and tool for setting the monitor ID. The actual RGB signal is unmodified.

Continuing the discussion from https://68kmla.org/bb/index.php?threads/mac-to-vga-monitor-adapter-struggles.45423/ - I'm building a Mac-to-VGA monitor adapter that works similarly to other video adapters, but with an added feature: it can also decompose a composite sync signal into separate...