exxos blog - random goings on

[exxos]

I have un-forgotten about the DAC FIX PCB again. I designed a slightly smaller board a couple years ago but could not get then assembled as they were too small for JLC to do them :( But by some "miracle", They can assemble down to 10x10mm now :yay2: :dualthumbup:

So now the new board is in my basket awaiting production.

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I will see if I can a few of the Falcon FPU osc clock boards done next...

[exxos]

FPU OC PCB done. JLC parts placement preview is out as normal.

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Going to have to take a few days off from stuff again because, as usual, the hurting hands thing :(

[Badwolf]

FPU OC PCB done. JLC parts placement preview is out as normal.

Dunno what you're on about -- looks exactly like the way I place 'em!

BW

[exxos]

Dunno what you're on about -- looks exactly like the way I place 'em!

:lol: :chairsmack:

[exxos]

Scored this off evilbay. Did not really expect it to work though anyway. The listing was stated as for parts not working, so I guess that was a bit of a clue :lol: Currently just seems to be a crash screen generator :lol: I took the chips out and cleaned them up a bit as there is basically corrosion everywhere.

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Decided just to chuck it in the ultrasonic... Only did not quite fit in the basket :lol: :roll:

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I doubt this will cure the poorly thing. I just wanted to clean a motherboard to see what happened more than anything :lol:

[exxos]

Holy mother of dirty motherboards Batman!

The text has vanished off half the chips as well :lol:

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[sporniket]

so shiny after a bath :)

[exxos]

so first up, it seems to have some weird reset issue. Occasionally it would boot up..

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I found C100 is basically limiting the reset voltage to just 1 volt! so for a quick fix I just slapped another over the pull-up and to actually reset properly!

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The next problem is, it seems to be suffering from that "Shifter goes nuts" problem.

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On this machine it does not seem to matter which version of the video shifter is fitted.

In any case I managed to get it run long enough to run a pass of GB6.

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It is indeed a very poorly STE. With a lot of TLC I think it can be brought up to fully functional. Though I will probably used as a guinea pig for 16Mhz buffer tests when/if I get time.

[exxos]

How time flies..

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[exxos]

I was not at home yesterday so the STE is turned off the entire time. Only thing I did just was to change the reset caps to solve the previous issue. And now with either version of shifter installed the video is perfectly fine again.


:WTF:

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