exxos's H5 C1 build

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Steve
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Re: exxos's H5 C1 build

Post by Steve »

I knew something must have been screwy with my board since the beginning, I've never had any luck with it. Really glad you are looking into it thx :)
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Icky
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Re: exxos's H5 C1 build

Post by Icky »

Odd as I have never had issues with the 3V3 bus or regulator. I know there are 7x 5V <-> 3V3 translator chips across the 3V3 already.

Duff chip may be? Not anywhere near my H5's to check.
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exxos
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Re: exxos's H5 C1 build

Post by exxos »

Icky wrote: Sat Jul 31, 2021 1:50 pm Odd as I have never had issues with the 3V3 bus or regulator. I know there are 7x 5V <-> 3V3 translator chips across the 3V3 already.

Duff chip may be? Not anywhere near my H5's to check.
It's not duff... Under a 1k load it outputs the correct 3.3v.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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Icky
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Re: exxos's H5 C1 build

Post by Icky »

exxos wrote: Sat Jul 31, 2021 3:21 pm
Icky wrote: Sat Jul 31, 2021 1:50 pm Odd as I have never had issues with the 3V3 bus or regulator. I know there are 7x 5V <-> 3V3 translator chips across the 3V3 already.

Duff chip may be? Not anywhere near my H5's to check.
Its not duff... Under a 1k load it outputs the correct 3.3v.
:)
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exxos
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Re: exxos's H5 C1 build

Post by exxos »

Finally got around to ordering the 220K 0805 resistors to fix the 3.3V bus properly.

I just blobbed normal solder on top of them to remove them all. Clean the pads up with some desoldering braid. Added a tiny bit of SMT paste and heated the suckers up. Done!

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https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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exxos
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Re: exxos's H5 C1 build

Post by exxos »

Bit of TOS hackery waffle https://www.exxosforum.co.uk/forum/viewt ... =50&t=5442

This is sooooo cool after a TOS hack I can now use 720K & 1.44 without the HD floppy wire :D

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Will see if I can emulate the DIP switches in hardware with something at some point. Still not getting the HD format option in GEM :lol: :roll:
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Steve
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Re: exxos's H5 C1 build

Post by Steve »

Hey Chris I just noticed on my A3 board the resistors seem to be 100k I think? 1003? Is that suitable or should I swap them?

Cheers

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exxos
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Re: exxos's H5 C1 build

Post by exxos »

Steve wrote: Thu Jun 02, 2022 7:57 pm Hey Chris I just noticed on my A3 board the resistors seem to be 100k I think? 1003? Is that suitable or should I swap them?
100K does seem to be ok in general. But I would recommend changing them to 220K just to be on the safe side.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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exxos
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Re: exxos's H5 C1 build

Post by exxos »

While testing out the second C1 build, I noticed the audio was distorted in games despite sounding fine in the diagnostic cartridge.

First glance there seems to be a lot of ringing on the audio signal. So just trying to work out why.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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exxos
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Re: exxos's H5 C1 build

Post by exxos »

Does anyone have a H5 C1 built up and not done the audio mods yet ?

It is really bizarre as the audio test cartridge plays each channel just fine. And yet when I load something like hassle master which plays music it is really distorted and hissy. Similar when I load again with chip music, it is like some voices are fine and then another one is distorted.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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