I just received an ACA500Plus purchased second hand from Amibay and at first glance everything looks to be okay, but either there's something wrong with it or the settings are messed up.
My Amiga 500 (rev5) boots up just fine to the ACA500plus menu and I can change and save settings, but I get a Guru Meditation every time I try to boot to KS3.1. F1 eventually boots to Guru, F7 boots to Guru. Strangely enough, KS1.3 basic configuration boots up just fine.
More info about my system: A500 rev5, KS1.3, no trapdoor expansion, no floppy drive. Basically a stock A500.
ACA500Plus ROM v0.110
At bootup Dismo scrolls through some numbers, but then stops and stays at 0_ with _ flashing all the time. Pressing the button on Dismo does nothing.
Zorro contacts cleaned and no help.
Can't update firmware/rom as trying to flash boots....surprise to guru.
Cycling through pages with TAB into "Autoconfig Information" there reads:
ACA500Plus autoconfig board not found
Possible cause: your system contains incompatible expansions.
Any and all help is appreciated!