Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site ariel.UUCP Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxb!mhuxn!mhuxm!mhuxj!houxm!vax135!ariel!jlw From: jlw@ariel.UUCP (J.WOOD) Newsgroups: net.micro.6809 Subject: Re: more on RMS, and the Model 9? Message-ID: <843@ariel.UUCP> Date: Mon, 11-Feb-85 21:52:32 EST Article-I.D.: ariel.843 Posted: Mon Feb 11 21:52:32 1985 Date-Received: Wed, 13-Feb-85 01:46:50 EST References: <3500073@uokvax.UUCP> Organization: AT&T-ISL, Holmdel, NJ Lines: 23 Even with the new version of the SAM the 74LS785 is not a real big upgrade for the SAM. All it supports is 16kx4 rams and the newer versions of the 64kx1 chips which were made as real 64kx1 rather than 4 16kx1 chips pasted together. There is no support for memory management or for true large address spaces. Therefore, unless the rather cryptic and unexplained statement made on both data sheets, the 74LS783 and the newer 74LS785 one, that it supports "Easy Synchronization of Multiple SAM Systems" is being used I don't see how the new system will support OS/9 Level 2 which has both large address space and memory protection. It was intended for either the SWTPc or the Gimix 6809 boards, both of which can support up to a Meg of address space (incompatibly, I might add - sigh). They use the newer definition of the SS50 buss the ss50c version which steals the former baud rate lines of the earlier spec. Joseph L. Wood, III AT&T Information Systems Laboratories, Holmdel (201) 834-3759 ariel!jlw