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Re: FMNs blog / the latest things hes briken(fixed)

Posted: Thu Jun 27, 2019 9:15 pm
by exxos
PhilC wrote:
Thu Jun 27, 2019 9:12 pm
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...

Re: FMNs blog / the latest things hes briken(fixed)

Posted: Thu Jun 27, 2019 9:17 pm
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.

Re: FMNs blog / the latest things hes briken(fixed)

Posted: Thu Aug 01, 2019 8:33 pm
by PhilC
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.
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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.
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Re: FMNs blog / the latest things hes briken(fixed)

Posted: Thu Aug 01, 2019 8:40 pm
by exxos
: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.

Re: FMNs blog / the latest things hes briken(fixed)

Posted: Thu Aug 01, 2019 8:41 pm
by derkom
Looking very nice indeed! :dualthumbup:

Re: FMNs blog / the latest things hes briken(fixed)

Posted: Thu Aug 01, 2019 11:00 pm
by PaulJ
New design looks good. The old one hide the floppy connector when it was used with a mega. Nice design!! :) :) :)

Re: FMNs blog / the latest things hes briken(fixed)

Posted: Fri Aug 02, 2019 10:07 pm
by exxos
:bravo:


If I could actually find the bag of audio connectors I would send you one!

Re: FMNs blog / the latest things hes briken(fixed)

Posted: Fri Aug 02, 2019 10:47 pm
by PhilC
exxos wrote:
Fri Aug 02, 2019 10:07 pm
: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.

Re: FMNs blog / the latest things hes briken(fixed)

Posted: Fri Aug 02, 2019 10:50 pm
by exxos
PhilC wrote:
Fri Aug 02, 2019 10:47 pm
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 :)

Re: FMNs blog / the latest things hes briken(fixed)

Posted: Fri Aug 02, 2019 10:51 pm
by PhilC
Ok, might add it to my list. Pink to match your monitor?