Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: notesfiles Path: utzoo!watmath!clyde!cbosgd!cbdkc1!desoto!cord!hudson!bentley!hoxna!houxm!mhuxr!ulysses!allegra!mit-eddie!godot!harvard!seismo!cmcl2!acf4!percus From: percus@acf4.UUCP Newsgroups: net.micro.cbm Subject: Re: adding memory on c64 Message-ID: <12900013@acf4.UUCP> Date: Fri, 21-Dec-84 18:49:00 EST Article-I.D.: acf4.12900013 Posted: Fri Dec 21 18:49:00 1984 Date-Received: Sun, 23-Dec-84 00:47:12 EST References: <396@hou2b.UUCP> Organization: New York University Lines: 22 Nf-ID: #R:hou2b:-39600:acf4:12900013:000:1043 Nf-From: acf4!percus Dec 21 18:49:00 1984 > i'm thinking of trying to increase the memory on my commodore 64. > i would like to do this myself. what is involved in this? can > i just replace the memory chips on the memory boards with higher > density chips? any leads would be appreciated. > > thanks, > danny chen > ihnp4!hou2b!dwc Well, you won't be able to do it with ease... The 6510 processor can only handle 64K of ROM and RAM combined (even though the C64 has 64K of RAM and 20K of ROM, it only "sees" 64K of both combined at a time). Richvale Electronics has an add-on 68000 processor (a 16-bit, much more expensive and not normally used in under-$500 micros) with memory expansion to 512K, but it costs quite a bit (not sure of precise amount). The other option is to have the memory "banked" in and out, so that the 6510 chip still only "sees" 64K at a time, but it is not very practical. For more information, consult your local off-net guru. Allon Percus ...!ihnp4!cmcl2!acf4!percus