lorddef wrote:
So it was named after the first expandble amiga? Interesting.
It was also a design example for an expander board. (basically a sidecar board that gave the A1000 some expansion slots)
The Zorro I slots were electrically compatible with Zorro II cards, but they face the other way around and the cards were square.
They redesigned the specification and changed the card form factor when the A2000 came out, because they wanted to use ISA cards in the same chassis. This became what we now know as Zorro II.
The A2000 is basically the A1000 design and the Zorro "example board" moulded together into the same board. They also changed the AmigaBus side connector into a female card edge and made that the A2000's CPU slot.. Also they added the simple video slot, basically the same signals as on the RGB connector, but inside the box.
The later A2000-CR is a redesign to use the cheaper A500 chipset, they also extended the video slot to include some more signals.. The original A2000 uses the A1000 chipset with DIL Agnus.