My version of Atari ST and MegaST IDE interface with TOS 2.06 decoder.
Original project by Peterra Putnik here: https://atari.8bitchip.info/astide.php (local mirror: aideif.gif   t206.jed)

You can put 4 TOS systems in 27C160 Eprom.
JP3 is decoding selector - upper position is 1.04 decoding (address $FC0000-$FEFFFF) - works with 1.04 TOS and DiagROM.
Lower position is 2.06 decoding (address $E00000-$E3FFFF) - works with TOS 2.06 and EmuTOS.
JP1 and JP2 select one of 4 TOS systems. Order of TOS systems in Eprom: DiagROM, 2.06, 1.04, EmuTOS.




There are two versions - with 40-pin or 44-pin connector:


gerbers_40pin.zip



gerbers_44pin.zip