I might as well use this thread and ask 
Is there an easy way to upgrade the A500+ Chip RAM ? Besides the trap door memory hack and piggybacking the on-board chips.
I mean, was there ever a solution meant specially as a +1MB Chip RAM. Like there was many Chip RAM add-ons for A600 (now popular A603 and A604).
I don't know what you mean by "trap door memory hack", because personally I won't consider this;
http://amiga.resource.cx/exp/a504plusas a hack. I actually happen to own one of these, and it worked straight away as 2Mb Chip RAM expansion. No other mods required, because A500Plus has 2Mb Agnus from factory. Good luck finding one.
