KICKSTART ROM	The Kickstart ROM was 256K bytes when using the ICS chipset. All Amigas using the ICS chip set were supplied with 256K bytes of Kickstart ROM although early A1000's used RAM which had to be loaded at boot-up time.
CHIP RAM	Chip RAM was limited to 256K bytes when using the ICS chipset. All Amigas using the ICS chip set were supplied with 256K bytes of chip RAM and no fast ram.
FAST RAM	Fast RAM is an optional extra and is limited by the microprocessor chip, but since the A1000 only used the 68000 microprocessor, the memory limit was therefore 8M bytes.