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#341 |
Registered User
Join Date: Jan 2004
Location: Yorkshire
Posts: 735
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New version is pretty much identical to a rev 2b board but with U49 added (whatever it is for), from what I've gathered through close inspection 2a was basically unfinished 2b in beta, 2d appears to be mostly elongated landing patterns for IC's with slightly different routing to compensate. I worked out the differences between 2a/2b by looking at via's on back of board etc but I missed 2 ground links under the ram due to a shadow and seeing as nobody will want to build/test slightly botched pcb's I uploaded the files. I've wasted too much money on it already and it's not like I'm rich, I've only been doing this for the community and because I find it strangely enjoyable. If the uploaded files don't work then the only explanation is either the schematics are wrong and there is something different hidden under an IC somewhere, it's something with the cxa2075 mod (the website I looked at did it to A1200 which doesn't use the RGB) or the original boards were 4 layers with internal power planes.
Last edited by Mick; 11 April 2020 at 19:50. |
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#342 |
Registered User
Join Date: Jul 2017
Location: me, usa
Posts: 42
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#343 |
Registered User
Join Date: Jan 2004
Location: Yorkshire
Posts: 735
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I uploaded the KiCad files to the zone a few weeks ago, it's all untested though.
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#344 | |
Registered User
Join Date: Dec 2018
Location: Sydney / Australia
Posts: 96
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Quote:
The boards are definitely not 4-layer. I have some A600 motherboard "pieces" from many years ago (long story) and I can see that it's a 2-layer. Thanks for your observations, it's interesting to see that the Rev 2A was indeed a "beta" board. Yes it's fun to develop hardware, but definitely not cheap. Even for companies I've worked for, it has been expensive. Personally it's left a big hole in my pocket a number of times. Can't help it though, must be addictive ![]() |
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#345 |
Registered User
Join Date: Jan 2004
Location: Yorkshire
Posts: 735
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It should be alright then it's just a matter of testing which isn't easy when people have lost faith.
I've spent the last 2 weeks doing CD32 but I think I will have to keep it original, it uses c-sync out from pin 11 of the cxa1145 and there isn't one on the newer dac. |
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#346 | |
Registered User
Join Date: Dec 2018
Location: Sydney / Australia
Posts: 96
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Quote:
CD32 boards might not be much in demand either. It takes very advanced soldering skills to assemble and certain parts are really rare. Then you need an optical drive or expansion card to make much use of it. All the CD32s I've come across were repairable, the main issues I see are leaking capacitors or faulty optical drive laser and PSUs. I would personally find it hard to justify the cost and effort to build a CD32 board or to use it. As long as you're having fun and improving your skills and knowledge that's probably a good thing ![]() In case you're interested, have you seen any of the retro brew computer sites? I'm active on them. There's lots of of opportunities to design cool boards and these are much cheaper and easier to work with: www.retrobrewcomputers.org and www.retrobrewcomputers.org/forum |
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#347 |
Registered User
Join Date: Aug 2019
Location: The Netherlands
Posts: 115
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You could strip all the connectors from a CD32 and build a core board with only the AGA chipset and Akiko. Put some a600 and A1200 connectors around the edge and build separate video/audio/IO boards like the A4000T. The user will have the freedom to build any shape of Amiga they want. I know it sounds like a crazy idea, but there is a lack of modular design with the recent Amiga clones
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#348 | |
Registered User
Join Date: Dec 2018
Location: Sydney / Australia
Posts: 96
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Quote:
To be honest I consider any CD32 derivative design to be a waste of the last few remaining Akiko chips in the world. I already repaired a CD32 with a damaged Akiko chip, I hope I don't have to do this again! They are not so hard to damage on a CD32. It's also very hard to solder this part by hand if you are not an expert, and I would hate for people to destroy these precious chips while attempting to "use" them ![]() Your idea is good, in which case you might consider to also create a new "Akiko" in a FPGA ![]() |
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#349 |
Registered User
Join Date: Aug 2019
Location: The Netherlands
Posts: 115
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There was a seller named Sveta over at AmiBay who sold very cheap NOS Akiko chips, but he got banned. I wonder why, because he was a very kind seller
![]() However, there is hope. The Apollo Vampire team have transfered the Akiko to FPGA: http://www.apollo-core.com/knowledge...28256&z=XJqOl2 ![]() |
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#350 | |
Registered User
Join Date: Dec 2018
Location: Sydney / Australia
Posts: 96
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Quote:
![]() ![]() The Apollo "Akiko" is an implementation of the C2P function of the Akiko to allow CD32 games to work with their core. I guess this means you can run CD32 games with no modification using their products. It's not really a stand-alone physical replacement for the Akiko if you were trying to build a re-implemented Amiga, but this is probably the future! |
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#351 |
Registered User
Join Date: Dec 2018
Location: Australia
Age: 51
Posts: 99
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Has anyone decapped and scanned Akiko?
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#352 |
Registered User
Join Date: Dec 2018
Location: Sydney / Australia
Posts: 96
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Unfortunately not. Also the person who designed it does not have the chip schematics anymore (someone asked her), so we can't use that avenue either, although she can probably answer questions and provide some details.
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#353 |
Registered User
Join Date: Sep 2020
Location: somewhere
Posts: 2
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So how is the project going? I wouldn't mind getting the gerbers and BOM and have a few boards made up.
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#354 |
Registered User
Join Date: Jan 2004
Location: Yorkshire
Posts: 735
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I've been working on A1200 as a hobby project, I went back to my original files and I'm in the middle of manually routing it which is taking ages.
I've not done anything with A600 in months, the interest in it (or getting help testing it at least) seemed to die down just when it looked most hopeful. I think maybe it's lack of confidence in me or relates to me using CD32Freak's files (for appearance) in much the same way he has taken them down, which is a shame because like I have said to him you can learn a lot from them. I might go back to my original A600 files later if the A1200 goes well but from what I've been told in PM's there are other A600 projects. To be honest I can't understand why there aren't already boards available when you have about 5 different A500 boards. Last edited by Mick; 10 September 2020 at 02:28. |
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#355 |
Registered User
Join Date: Aug 2019
Location: The Netherlands
Posts: 115
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Mick, maybe you should not waste your time on the old Commodore designs, but focus more on creating something innovative like the A1200+ by Jeroen Vandezande:
https://bitbucket.org/jvandezande/am...00/src/master/ ![]() |
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#356 | |
Registered User
Join Date: Sep 2020
Location: somewhere
Posts: 2
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Quote:
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#357 | |
Amiga is my Religion
Join Date: May 2005
Location: Germany
Posts: 578
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Quote:
I think there are some people out there who just want a 1:1 copy of the original design without any modifications like me. |
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#358 |
Registered User
Join Date: Aug 2019
Location: The Netherlands
Posts: 115
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Well then my Gerber conversions of the Amiga PCB Explorer boards were as close you could get to a 1:1 copy, but some crybabies in our community said it was wrong to copy a copy of what was illegally obtained in the first place.
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#359 | |
Registered User
Join Date: Dec 2018
Location: Sydney / Australia
Posts: 96
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Quote:
![]() Jokes aside, the A600 revision 2A PCB is a preliminary Commodore design that was never released and has a number of issues. It should not be used as-is, it's not very likely to work! |
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#360 |
Registered User
Join Date: Aug 2019
Location: The Netherlands
Posts: 115
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The only way to be sure is with PCB deconstruction techniques:
http://www.grandideastudio.com/pcbdt/ Or Multi-layer printed circuit board analysis system using X-ray equipment: [ Show youtube player ] ![]() Last edited by CD32Freak; 14 September 2020 at 07:47. |
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