amiberry VS VHDL6526

Should be possible. It seems to be open source, you'll just need to compile it in Termux: https://github.com/BlitterStudio/amiberry

A500 Mini is just an overpriced, very low end device that runs Amiberry, designed to extract money from suckers.

If you edit/change the contents of the whdload_db.xml file inside the boot-data.zip then you can change the per-game settings. I don't know what all the possible settings are but you should be able to make it boot to an Amiga4000-like config (or at least with a faster CPU). Some more details about this at https://github.com/BlitterStudio/amiberry/wiki/WHDLoad-Auto-booting

However, I don't know how to tell the A500mini (or more specifically, the amiberry version running on it) to use these arguments. I've figured out that after opening the game options, a file called "Historyline_v1.5_1569_ol.uae" is created on the USB drive. Based on information found elsewhere, I have manually added the following line to this file:

They're just making money off Amiberry, an easy to use Amiga emulation solution for Raspberry Pi.

I recommend updating the WHDLoad DB XML file in the TheA500 folder. It's in one of the sub folders. The latest XML file can be found here - https://github.com/midwan/amiberry/blob/master/whdboot/game-data/whdload_db.xml.

8520's can still be gotten NOS from Analogic and probably a few other places but there are also a couple of projects in progress at the moment to replace the CIA's

https://github.com/niklasekstrom/cia-verilog

https://github.com/bwack/VHDL6526 (6526 and 8520 differ only in their TOD clocks so it should be simple for this to support both kinds)

I don't think you will see new custom chips made to match those chips, however they are small enough to be easy to implement in a modern CPLD/FPGA.

I know of three such projects at the moment:

J-CIA: https://1nt3r.net/j-cia/

FBI: https://www.forum64.de/index.php?thread/84273-wip-fbi-als-er...

VHDL6526: https://github.com/bwack/VHDL6526

The 6526 CIA from the C64/128 is almost identical to the 8520 from the Amiga, the only difference is in the time-of-day clock registers. The 6526 uses BCD encoded TOD, the Amiga 8520 counts seconds since midnight.