Serialport is important for DiagROM. (that will be very useful for debugging) but a db9 port. make it more modern. :)
external floppy. well I can handle without it. do as AmyITX, they have used unused pins of the internal 34pin floppyconnector to handle more drives. then people can do a connector by themselved for external. if they want to. |
I'd definitely keep Zorro slots on the board, I'd love a new(er) A4000 motherboard for ATX cases but I also have a lot of Zorro II/III cards that I don't want to give up.
I'd want the A4000 experience.....Zorro boards, video slot, etc.. I agree with Chuck on changing as little as possible on your first design to make sure you have everything working, then start making your desired changes. |
Yes i agree with changing as little as possible. But there are things that can be easily left out, because they aren't connected on Standard.
Does the A4000D need a Riser Board to work? Zorro is neat yes. But won't be unhappy to let that work be in queue for next Revision. A running version would be nice first. The 23 pin Video out is a pain in the ass too...... Which Pins aren't needed? I would opt for a D-Sub 15 instead if possible......but don't know if someone needs specific pins. Any suggestions? |
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Amigakit does an adapter that allows the 23 way RGB to be converted to suit 15 way VGA. OK so it doesn't allow all modes but it does work to a fashion. Perhaps you could get some info on what pins go where with that device?
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My thoughts are that if it's the A4000 you are duplicating, have the features an A4000 had in support of the boards available for the A4000 (Toaster 4000, Scandoubler/FlickerFixer's, etc..). My A4000D is using Video (Toaster 4000) and Zorro (Picasso II). My A4000T is using every slot available (both Video and all all accessible Zorro). Just my opinion.... |
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Will most likely build a Prototype without that interfaces. And adding them after testing. |
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Hmm, on the Power Input Pins to the A4000D Boards is a _FAIL pin. Does the Power Supply hold that low till it's rails are stable? Or is there another reason for this, does the logic on the Board pull that low on failure? Maybe someone could measure that pin? Sry have no A4000 yet :D
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So, the _FAIL line goes high if the PSU becomes stable. Are there any obsolete Jumpers? In which cases is sync on green used for example?
Ahh and of course it'll be open sourced ;-) |
You should get a soldering iron, it might come in handy if you're going to build a computer.
Oh, and you need a motherboard and a processor as well. |
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A bit chaotic atm. Should be enough? :)
Building schematics in kicad for now. This'll take a while since it's a fun project and only spare time goes in there. Want to get as much information as possible about what's obsolete in the schematics --> like the 8M Chipram jumper in the schematics.... Don't want to implement such things later in PCB Layout..... I'll give it my best! |
Some nice equipment there !!
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Best of luck and don't forget to keep us updated on progress!
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Why not have the connectors as internal headers with rows of pin pairs?
Then you attach a flat cable to a break-out connector in one of the back slots. AFAIK that is how Amiga tower designs have been. |
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Still on first page.....this'll really take a while :D |
@elenachen, how big is this new board of yours going to be? I ask this as an idea of converting existing PC cases to suit your design.
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