The A2000, A3000, and A4000 all have ISA slots, but they are inactive. This means that there is no controller hardware, and there is no means for the Amiga to talk to anything plugged into them.
They are activated by a "bridgeboard". This is a card with an x86 processor (typically 286 or 386). These allow you to run MS-DOS or Windows 3.1 on the bridgeboard processor, and plug PC cards into the ISA slots.
Some, but not all, bridgeboards make it possible to access these cards from AmigaOS.
Commodore made a couple of bridgeboards, and there were some third party ones. (such as the Vortex GoldenGate cards).
One thing is unclear : What is this A2286 board ?
Its a bridgeboard.
Do I have one in my barebones A4K
No.
