RESET circuit tweaks

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Re: RESET circuit tweaks

Post by Icky » Sat Nov 17, 2018 10:57 am

Wow that was fiddly.

First chip and board was an absolute mess with my shaky hands / fingers.
Second chip pinged out of my inverse tweezers and is to never be seen again in the Atari workshop.
Third and final attempt I got the board soldered ready to test the reset circuit.

IMG_3291.png
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Re: RESET circuit tweaks

Post by Icky » Sat Nov 17, 2018 12:23 pm

It looks like we have a winner. It delays on power-on, resets and boots. On pressing the reset button also resets and boots.

Have cycled this 10 times on / off with 10 reset button presses between each power cycle to make sure

Need to replace U1 from LS05 to an LS07. As mentioned by Exxos this will effect the MIDI as U1 also is used there.

So the the circuit is as follows (lifted from datasheet)

Screen Shot 2018-11-17 at 12.17.33.png
Screen Shot 2018-11-17 at 12.17.33.png (53.72 KiB) Viewed 2013 times

Here is it plugged into the board in all its hackery. Wires go underneath and cross into pin 2 and 3.

IMG_3292.png
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Re: RESET circuit tweaks

Post by exxos » Sat Nov 17, 2018 12:25 pm

:cheer: :cheer: :cheer: :cheer: :bravo:
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Re: RESET circuit tweaks

Post by Icky » Sat Nov 17, 2018 12:35 pm

exxos wrote:
Sat Nov 17, 2018 12:25 pm
:cheer: :cheer: :cheer: :cheer: :bravo:
So thats cut out a lot of components for the next version. What's the next challenge Exxos?

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Re: RESET circuit tweaks

Post by exxos » Sat Nov 17, 2018 12:57 pm

Icky wrote:
Sat Nov 17, 2018 12:35 pm
So thats cut out a lot of components for the next version. What's the next challenge Exxos?
:thumbup:

Next will be the video DAC board, assume they coming Monday :shrug:

I don't think there is much else left after that.. If you wanted a good challenge, I designed a IDE circuit like 2 years ago which needs building and testing. viewtopic.php?f=29&t=371&p=2572
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Re: RESET circuit tweaks

Post by Icky » Sat Nov 17, 2018 1:19 pm

exxos wrote:
Sat Nov 17, 2018 12:57 pm
Icky wrote:
Sat Nov 17, 2018 12:35 pm
So thats cut out a lot of components for the next version. What's the next challenge Exxos?
:thumbup:

Next will be the video DAC board, assume they coming Monday :shrug:

I don't think there is much else left after that.. If you wanted a good challenge, I designed a IDE circuit like 2 years ago which needs building and testing. viewtopic.php?f=29&t=371&p=2572
I take it this for inclusion into next board?

I can start to have a look.

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Re: RESET circuit tweaks

Post by exxos » Sat Nov 17, 2018 2:22 pm

If we can get a reliable ide going, it can either go on the booster card (as it has a pld already) or it can have its own pld on the next stf board. It would be super cheap to add ide to a new MB.
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