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PhilCs blog / the latest things hes broken(fixed)

Blogs & guides and tales of woo by forum members.
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exxos
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Re: FMNs blog / the latest things hes briken(fixed)

Post by exxos »

PhilC wrote: 27 Jun 2019 21:12 I think I'd need to download 3 million windows 3.1 installation disks on 360k floppy first though right?
Thought there was a DOS version ? Or maybe it was in Qbasic...
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Re: FMNs blog / the latest things hes briken(fixed)

Post by PhilC »

I'm going to dig out a copy of commander keene over the weekend.

It'd be pretty easy to make a modern version of this board now, 1 NEC V30, a CPLD and a few caps and diodes.
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Re: FMNs blog / the latest things hes briken(fixed)

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Bit quiet on my blog lately thanks to real life getting in the way.

Thanks to exxos, been working on his VGA adaptor today. I did have two of the UBESwitch ones before and although they have more features I found them a little too fragile. I'd managed to break off the button on both and the headphone socket on another.

Granted, I was plugging it in and out quite frequently, so this didnt help.

Exxos has designed an adaptor that uses some through hole components and a simple jumper for mono / colour selection. This will make for a simpler, cheaper and more robust VGA adaptor.

Here's the nearly finished article, minus the headphone socket as I need to desolder one from an old radio on the shelf behind me.
20190801_193004.jpg
The other difference between the UBE version and this one is that exxos has done away with the 3 RGB adjustment pots, which were a bit of a pain to get right. Instead exxos has used 3 voltage dividers to control the monitor brightness, ghosting, etc.

My job today has been to try a few different variations for the voltage dividers and hopefully we are somewhere near now.

Have a look below, not too shabby on my old NEC if I do say so myself.
20190801_193054.jpg
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Re: FMNs blog / the latest things hes briken(fixed)

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:bravo: :coolpics:

Yeah the pots (now resistors) were set as high of brightness as I could get them before I got odd colour bleeding/ghosting issues. It was to much of a pain to adjust them anyway.
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Re: FMNs blog / the latest things hes briken(fixed)

Post by derkom »

Looking very nice indeed! :dualthumbup:
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Re: FMNs blog / the latest things hes briken(fixed)

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New design looks good. The old one hide the floppy connector when it was used with a mega. Nice design!! :) :) :)
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Re: FMNs blog / the latest things hes briken(fixed)

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:bravo:


If I could actually find the bag of audio connectors I would send you one!
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Re: FMNs blog / the latest things hes briken(fixed)

Post by PhilC »

exxos wrote: 02 Aug 2019 22:07 :bravo:


If I could actually find the bag of audio connectors I would send you one!
Cool, thanks. Do you have a plan for a case yet? Btw, angled headers seem to work pretty well for the mono / colour jumper but might find a toggle switch that fits too.
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Re: FMNs blog / the latest things hes briken(fixed)

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PhilC wrote: 02 Aug 2019 22:47 Cool, thanks. Do you have a plan for a case yet? Btw, angled headers seem to work pretty well for the mono / colour jumper but might find a toggle switch that fits too.
No plans to do a case. Not even finished the RTC case yet :)
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Re: FMNs blog / the latest things hes briken(fixed)

Post by PhilC »

Ok, might add it to my list. Pink to match your monitor?
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