All i need from fat gary is the extra address lines so i can make sure of stuff to operate within limits these address lines would be placed on a different board fitting over the current motherboard as so many expansions.
I am currently looking at a Kickstart switcher(nothing more then a simple jumper cutting VCC to one or another socket)

my two biggest worries for the moment are how the heck is it all gonna fit on the board and i hope the PSU can handle the extra drain.

Besides only part i need the extra 8 address lines for is to AND them so i can use them safely without risking compatibility.(yes this is one of the reasons i go CLPD on this)
I think i can add some 244 or 245 to the datalines of the rom easy enough.
Besides that i can just have a empty second socket.(who needs flash when you have a UV lamp and a EPROM?)

68EC030 doesn't have a MMU so only form of write protection i can give is placing it outside the address range of the real machine.

Btw how much memory can AOS handle?

1MB Kickstart is possible but needs some tricks to get it working. I gave you already the links with the needed info.
Jens Schoenfelds new A1200 Turbocard solves the Kickstart quite alike.
An alternative would be 512 MB expansion rom + 512 MB Kickstart from the hardware side same but easier from software side.
 
Classic Amiga (500, 2000 also 1200 because of the castrated CPU) can handle up to 2 MB chipram + 8 mb fastram (CPU limit 16MB).
 
When using a full 68020 or greater (CPU limit 4GB) up to 2GB are possible as AOS interpretes adresses > 2 GB as signed < 0 what indicates an error.
Also some MB of adressspace is reserved for IO.
 
The maximum usefull memory for such a slow CPU is around 64-256 MB.
99.x% of the AMIGA software will not make use of more than 32 MB.
Just some professional 3D-rendering software will gain from it.
As HDD is often to slow for fullscreen video (remind mp2 and mp4 can not be done in software on this CPUs) a RAM-disk can be very usefull for playback of animations.
People tested Amigas with more than 1 GB but just to prove it's possible.
 
You should use 5V tolerant SRAMs to keep it simple and payable and think how much is really use full to my opinion 32 or 64 MB is enough. Don't think about using SDRAM or DDRRAM you need to adopt voltage and take care for refresh, adopt the timing etc. you will need your complete CPLD for doing that and maybe more. Also expensive tools (multichannel highspeed logicanalyzers and the knowledge how to use them) and 4 layer PCBs are needed.

-MC68EC030F
-MC68882F
-Altera CLPD probably the MAX 3000A series (EPM3128A or EPM3256A depending on the Size of the gate array)
-ATA revision 2, both IDE and CF interfaces (hoped i would be able to use higher but i am limited have been limited without breaking A600 code)
-For the expanded memory i would keep to the 3000 memory map relocating the kickstart to the first MB of the expansion memory on a 3000 memory map.
-Memory as much as i am allowed to use.
speed rating is still in the dark this would depend on what i can get my hands on.

FYI Stefan i am making the board where i currently work, using a milling cutter to make a proto-board.
Using SMD components over conventional one's where i can.(beats having to get VIA's in the board. ;))

Seriously the amber chip is one of the reasons i am doing this.
the three other reasons are i am getting a little bothered by needing to swap floppies all the time hence the HDD.
the 68EC030 will give a nice speed boost while remaining Asychrone with the bus and allows adding a 68882.
Kickstart swapper.
And Added RAM.

5 reasons i have to do this project.

Do you already have the CPU and FPU? If yes what speedgrade?
For what do you need the FPU? Raytracing? I would prefere to go sync and skip the FPU this will give you more far more power as memory interface is much faster and the chip could be clocked at 28 or 56 MHz. Mostly benchmarks and raytracing software will gain from the FPU. But for Raytracing the Amiga with 030 is still to slow. For the standard software the FPU will be a brake.

Stefan i am reading the 68030 tech manual on the matter mind if I talk about the pro's and con's of a FPU on the bus in a later post?

Btw I have one of this A2320 Flickerfixers but i'm not willing to sell cheaper as the ebay guy. Also I modded it to fit into my A4000, and it's a fully working prototype board I got from the commodore leftovers.
 

DRAM Dynamic Random Access Memory, SRAM Static Random Access Memory.
DRAM uses a capacitator these wear out on some cheaper RAM's.

FPGA's the cheap ones use a form of SRAM within of which the gates wear our and the smaller feature size and faster clock speeds Aid this wearing out.
Resulting over time that some SRAM cells show some wrong information in them because they are switched into a wrong state.

Silicon viberates on the frequency of it's clock or one of the frequency resonate that coincides with the clock more current creates more heat and effectively evaporates gates.
 
So it is something that that effect all electronic devices.
What matters here a lot is feature size smaller sizes last shorter.(less room for error)
Current is a variable since the voltage is set to a level .(ohm's law U=I*R, P=U*I, P==Watt/s)
Frequency, the higher this is the more the silicon viberate along with it.

Higher Current, More Heat, Viberation.(nearly sounds like magnets to me)

A prolonged period of time would be 12 years.

PS: Pure silicon is a resistor near 0 Kalvin.

EXTERNAL LINK