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OCS Chipset Memory Amiga OS A500 B2000 A2500 A1500 CDTV

Amiga Memory with OCS

Amigas using the Original Chip Set employed the three types of Amiga memory - Kickstart ROM, CHIP RAM and FAST RAM as follows:

KICKSTART ROM 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 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 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.

Copyright 2005 Amiga Auckland Inc. All rights reserved.
Revised: September 25, 2005.