Amigas using the Original Chip Set employed the three types of Amiga memory - Kickstart ROM, CHIP RAM and FAST RAM as follows:
The Kickstart ROM was 256K bytes when using theOCS 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 was limited to 512K bytes when using the OCS chipset. All Amigas using the OCS chip set were supplied with
512K bytes of chip RAM and no fast ram.
Fast RAM is an optional extra and is limited by the microprocessor chip. For the machines such as the A500, A1500
and B2000 that used the 68000 microprocessor, the memory limit was 8M bytes. Machines such as the A2500, or the B2000
with optional add-on accelerator card, could utilise considerably more but seldom used more than 64M bytes because of
the cost of the memory.