Article View: net.micro.6809
Article #732Re: OS9 Level II program size
From: dibble
Date: Sun, 13 Jul 1986 03:23
Date: Sun, 13 Jul 1986 03:23
19 lines
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> How does OS9 Level II > cope with the 64K address space limit of the 6809? > but can individual programs > be larger than 64K. While I'm on the subject of OS9, does OS9/68K > also use position independent code for its modules? > > Terry Ingoldsby OS-9 Level Two uses a DAT (Dynamic Address Translator) to map the 64K address space of the 6809 into whatever memory the system has. Each _task_ can see one 64K address space at a time. Modules can be in any number of address spaces at the same time. There are lots of tricks for using more than 64K at a time. All the tricks turn on splitting the program into several tasks, each with up to 64K, or swapping pages between address spaces. OS9/68K requires position independent code. Peter Dibble
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!utcs!mnetor!seismo!rochester!dibble From: dibble@rochester.UUCP Newsgroups: net.micro.6809 Subject: Re: OS9 Level II program size Message-ID: <19374@rochester.ARPA> Date: Sat, 12-Jul-86 23:23:46 EDT Article-I.D.: rocheste.19374 Posted: Sat Jul 12 23:23:46 1986 Date-Received: Sun, 13-Jul-86 04:59:08 EDT References: <247@vaxb.calgary.UUCP> Organization: U of Rochester, CS Dept., Rochester, NY Lines: 19 Keywords: OS9 Summary: OS-9 Level Two DAT