Say Y here to enable support for the "DIO" expansion bus used in HP300 machines. If you are using such a system you almost certainly want this.
This enables support for the Zorro bus in the Amiga. If you have expansion cards in your Amiga that conform to the Amiga AutoConfig(tm) specification, say Y, otherwise N. Note that even expansion cards that do not fit in the Zorro slots but fit in e.g. the CPU slot may fall in this category, so you have to say Y to let Linux use these.
Include support in the kernel for pcmcia on Amiga 1200 and Amiga 600. If you intend to use pcmcia cards say Y; otherwise say N.
Find out whether you have ISA slots on your motherboard. ISA is the name of a bus system, i.e. the way the CPU talks to the other stuff inside your box. Other bus systems are PCI, EISA, MicroChannel (MCA) or VESA. ISA is an older system, now being displaced by PCI; newer boards don't support it. If you have ISA, say Y, otherwise N.
This option enables support for the ROM port ISA adapter used to operate ISA cards on Atari. Only 8 bit cards are supported, and no interrupt lines are connected. The only driver currently using this adapter is the EtherNEC driver for RTL8019AS based NE2000 compatible network cards.