Minimig AGA and FPGA Arcade are the same thing. I have one of the last beta boards and MikeJ is off to China this week to run off a batch of "gold" boards for general sale. It will also run other cores to give you other classic computers and arcade machine games. A 68060 board with USB and other features is in development and running.
The Natami should be an advanced version of the basic FPGA Arcade with the most of the features of the FPGA expansion board included along with some other goodies. It looks to be an advancement of the classic A1200/A4000 chipset.
The FPGAArcade (Replay board) Amiga codebase has diverged significantly from the Minimig code - and will continue to do so as I am re-writing all of it to improve area and timing at the moment. It also has different video / audio / memory interfaces.
It has been tested with 1920x1080P (HDMI) and 24 bit 192KHz audio. The 68020 core is also new of course.
The Natami is a very interesting project, but I do not see a need for legacy interfaces like floppy and IDE. A large SDHC card on the Replay board will support 4 virtual floppy drives and two 4G hard disks - and the transfer rate probably out performs old IDE drives.
I may do a floppy interface to play with my Atari disk controller, but I really can't be bothered to dig out a drive. I would rather fix the remaining disk capture problems. I have been rescuing a lot of my old code from amiga/atari floppies recently and some of the disks are not readable after 20 odd years.
My aim is to get the cost down and end up with a board which can actually be produced. That's why it's so small (6 layer PCBs are expensive) and the features on the base board have been chosen for as wide an audience as possible while keeping the components used to a minimum. A lot of techniques used for "real products" have been used here, such as stress testing the memory to test the operating margins and high-speed measurements using 20Gig test kit to measure eye-patterns on DVI, clocks etc. Also, the entire board is impedance controlled to get good signal integrity.
The other big difference between the Natami and Replay board is the use of the ARM controller. Not only does this do the bridge to the SD card file system, it also acts as a boot and configuration controller - so you can choose your platform and options using the on-screen display.
You don't need to "reflash" like the Natami. You can take the SD card out, replace the core binary file, stick it in again and do a soft-restart of the system.
You can change from an Amiga to an Atari to a Spectrum without powering down.
Anyhow, I've got to finish the DRC (design rule checks) for the boards...
Cheers,
MikeJ
