Hi guys had pcb way made up some TF520 pcbs rev 3.0 have 3 spare if you want one iv'e build up 020 @ 40 mhz (ive got a 020 20@40 running stable in a a500 with heatsink and 3m double sided termal tape) send me a pm ill post it to ya works with atari st 520 also, might even work in a classic also...