Nope, the Tabajara is hacking a 72 pin SIMM onto the A600 expansion slot. The piggyback hack is removing two chips from an old video card (Cirrus Logic, S3 Trio etc) and piggybacking them over the original memory chips. Talk to Zetr0 on EAB about it, it's not that hard to do.
They attach to one of the legs of the chips as per the attached pictures. The wires attach to pins 28 and 29 on each chip if I recall correctly. The pictures aren't great but you get the idea; Zetr0 can help you with how to do this. The thread is at http://eab.abime.net/showthread.php?t=3 ... t=A600+2Mb if you need to read further.