Alternate TT hi/VGA adapter

[CodeKiller]

I have made a few devices for the Atari TT to connect to a regular VGA monitor.

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- has a switch to change between standard color-VGA or the mono high-rez (the computer restarts after switching).
- needs only 5V DC though a standard mini-B USB connector (easy to use with phone charger)
- compact and boxed (inside there are some bodge, but not visible from outside)
- high-rez mode has Horizontal-fix; standard VGA mode does not affected by it.
- fully tested
- only 50€ a piece (+6€ shipping)

[shoggoth]

Nice! Picture quality looks good too (no ghosting)

[Cyprian]

I have made a few devices for the Atari TT to connect to a regular VGA monitor.

- has a switch to change between standard color-VGA or the mono high-rez (the computer restarts after switching).
- needs only 5V DC though a standard mini-B USB connector (easy to use with phone charger)
- compact and boxed (inside there are some bodge, but not visible from outside)
- high-rez mode has Horizontal-fix; standard VGA mode does not affected by it.
- fully tested
- only 50€ a piece (+6€ shipping)

one device pls.

[EmpireAndrew]

I'd like one how do I order?

[CodeKiller]

Video quality mostly depends on your monitor of choice (for some CRTs it may have low output current(?) -- darker screen), if pixel-accurate mode not available at least the moire patterns have to dealt with (maybe some VGA cables can cause ghosting, but not sure..)
The pic has been taken from a monitor of a friend -- my samsung tv/monitor makes that checkerboard flat gray after fiddling with the setting, but still clearly readable.

I have 7 pieces to sell, please PM me if you'd like one.

[jvas]

I have one and it works great! Thanks CodeKiller!

[CodeKiller]

5 pieces are still available -- PM if interested!

[Bama]

PM sent.

[EmpireAndrew]

I can confirm it works...

(turn on HD in the youtube settings cogwheel below):

TT High on standard LCD

[tenox]

Nice!

[EmpireAndrew]

Hmm, well mine has just died I think...

I bought a new monitor and tried plugging it in via the adapter and while it continues to work fine in anything up to ST High or TT medium, the TT high mode is not working any more.
The display is mono, but the resolution doesn't change from TT medium, and the monitor display is massively distorted.
I plugged the previous working in TT high monitor back in and same issue...
I think one of the connectors on the adapter is slightly loose now. It was always a tight fit on the cable so you had to push quite hard when plugging it in, but I wasn't careful about it (forgot!) when plugging the 2nd monitor in.
I suspect something is disconnected inside...

[CodeKiller]

I'm sorry to hear that!
I think it may be a problem with the power connector. Can you wiggle it a little? If that's not helps, could you send a picture of the inside (focusing on the usb connector)?

--Wait a bit-- if the ST/medium modes works fine, then that can't be power problem
"The display is mono, but the resolution doesn't change from TT medium," -- so it means the monitor still get 640x480 mode (by H/V sync signals) but the actual pixels are monochrome (maybe garbage)? In that case the mode select (pin9 to TT) may be not connected.
Do you plug it directly to the TT and then whatever cable to your VGA monitor or the adapter sits between two cables? (b/c standard VGA cables may lack pin9 altogether)

[EmpireAndrew]

OK, the plot thickens...
Good detective work!
I didn't know some cables don''t have pin 9 (every day is an education!) so I switched back to the original monitors VGA cable as well (I was using original monitor with new VGA cable after new monitor failed to work I switched the monitor back but not the cable) and now the monitor is reporting 1280x960 at 72khz and 72hz. (it was reporting 640x480 at something like 31KHz etc). So that's an improvement, the monitor is at least being told the correct info. But now the display is black basically. Still works in TT-Medium/ST-High though.

[CodeKiller]

Could you send a picture of the screen? (in medium and in hi-rez too)
Have you tried to plug the adapter directly to the atari TT?
(does your monitor has a voltage-range selection? tried to change it? (if i remember correctly, there may be 1Vpp and 0.7Vpp options))

[EmpireAndrew]

It's plugged directly into the back of the TT.
I don't recall seeing a voltage adjustment on either of my monitors.
I'll video it when I get home from work.

It was working with this monitor, cable and USB power cable and power adapter. It only stopped when I unplugged it and plugged in the new monitor. I'm suspecting a loose conn crook inside it, most likely at a socket. I'll photo the inside too.

[panderpaw]

Is still possible to order one?

[CodeKiller]

Is still possible to order one?

Yes, the last one is still available, please PM me.

[vhenares]

I'd like one how do I order?
Thank you

[CodeKiller]

Sorry, just sold the last one.

But if there are 3-4 more people interested, I can order parts for another batch and build them.

[nobox]

I am interested, too.

[vido]

And me too!

[Mark_G]

I'm also interested.

[CodeKiller]

Ok, then i will order parts

It will take for 1-2 months however..

[DOB]

I'm interested. Keep us posted on your progress with the next batch.

[Mark_G]

Any progress ?