Need Gayle Truth Table

[Dr_Righteous]

@alexh

Yes. A new PCB.

Without mouse/joystick, keyboard, parallel, serial, IDE, floppy, sound, PC Card or any other legacy I/O functions.

Just AGA graphics and Zorro II expansion slots. That's it.

[cicero790]

I don't understand a word of this, but this is the same attitude that took us to the moon. I hope you find a way. The best of luck with the project. :-)

[alexh]

You gonna re-write / patch the kickstart ROM?

I think that it is technically feasible. But you will have to be able to design PCB's and have the software etc. You'll need a working knowledge of analog and digital design. 68000 bus topology. Amiga bus design etc.

The biggest problem is finding a good source of AGA chips.

I would recommend that you turn your interest to FPGA programming and work on the MiniMig core instead. This is more likely to help reach your goal in the long term.

[alexh]

cicero790 wrote:
this is the same attitude that took us to the moon.

How do you mean? The "We do not have the technical ability to do this, so lets fake it" attitude? ;-)

[bloodline]

Dr_Righteous wrote:
@alexh

Yes. A new PCB.

Without mouse/joystick, keyboard, parallel, serial, IDE, floppy, sound, PC Card or any other legacy I/O functions.

Just AGA graphics and Zorro II expansion slots. That's it.

Even without the legacy ports you'll still need the CIA chips as AmigaOS uses their timers etc...

-Edit- You'll also need Paula for the interrupt control of the 68k... The Amiga was really very highly integrated, you can't just lop bits off...

[alexh]

You could buy an A1200 and a Zorro bus board and desolder all the legacy connectors :-)

The features of the Paula and the CIA will be part of the MiniMig core and so you could probably use a small FPGA to work around those chips.

[cicero790]

alexh wrote:

cicero790 wrote:
this is the same attitude that took us to the moon.

How do you mean? The "We do not have the technical ability to do this, so lets fake it" attitude? ;-)

Ah, alexh, don't waste your brainpower on me.   :-)

[alexh]

The "Did we? Didnt we?" go to the moon argument is one of my favourite. I am an amateur astronomer, educated Physicist,  and knowledgeable mechanical engineer and even I am still in two minds.

But this is another thread.

[bloodline]

alexh wrote:
You could buy an A1200 and a Zorro bus board and desolder all the legacy connectors :-)

The features of the Paula and the CIA will be part of the MiniMig core and so you could probably use a small FPGA to work around those chips.

Then why not just add a Zorro compatible connector to the MiniMig :-)

Zorro I was basically just the 68k signals anyway...

[alexh]

bloodline wrote:
Then why not just add a Zorro compatible connector to the MiniMig?

Because it has no AGA. Real chips would offer better OCS/ECS compatibility than the current core of MiniMig.

[bloodline]

alexh wrote:
The "Did we? Didnt we?" go to the moon argument is one of my favourite. I am an amateur astronomer, educated Physicist,  and knowledgeable mechanical engineer and even I am still in two minds.

But this is another thread.

I'm in the same boat, 90% certain that we did... but no escaping that 10% doubt...

[bloodline]

alexh wrote:

bloodline wrote:
Then why not just add a Zorro compatible connector to the MiniMig?

Because it has no AGA. Real chips would offer better OCS/ECS compatibility than the current core of MiniMig.

I think it would be easier to add AGA compatibility to MiniMig than to try and build a whole new Amiga PCB...

[alexh]

bloodline wrote:
I think it would be easier to add AGA compatibility to MiniMig than to try and build a whole new Amiga PCB...

I disagree.

PCB design is fairly easy. Once you're trained and with the right data sheets, the right tools, the right gerber files, (and the right amount of money!) you can knock off a PCB inside a week. Even at the complexity of the Amiga motherboard. From start to finish, with debugging, 4-5 man weeks.

It will take several years to develop MiniMig AGA compatibility to the same level as you would get from real chips AND then you'd have to develop a new PCB anyhow!

[bloodline]

alexh wrote:

bloodline wrote:
I think it would be easier to add AGA compatibility to MiniMig than to try and build a whole new Amiga PCB...

I disagree.

PCB design is fairly easy. Once you're trained and with the right data sheets, the right tools, the right gerber files, (and the right amount of money!) you can knock off a PCB inside a week. Even at the complexity of the Amiga motherboard. From start to finish, with debugging, 4-5 man weeks.

It will take several years to develop MiniMig AGA compatibility to the same level as you would get from real chips AND then you'd have to develop a new PCB anyhow!

Ok... well, then... I'd just say use UAE :-)

[little]

Because it has no AGA. Real chips would offer better OCS/ECS compatibility than the current core of MiniMig.

Call me crazy, but is there any chance get a hold of the molds used to make the enhanced chip set? I mean, supposing they are not one mile deep in a city trash dump, what else can they be used besides making those chips? Since the rights to that technology has probably expired, it might be feasible.

[bloodline]

little wrote:

Because it has no AGA. Real chips would offer better OCS/ECS compatibility than the current core of MiniMig.

Call me crazy, but is there any chance get a hold of the molds used to make the enhanced chip set? I mean, supposing they are not one mile deep in a city trash dump, what else can they be used besides making those chips? Since the rights to that technology has probably expired, it might be feasible.

As far as anyone knows none of the old chip masks exist any more... Plus they would be for an old chip process, I imagine it would be hard to find a Fab that could even use the masks nowadays...