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From: pc@unisoft.UUCP (Paul Campbell)
Newsgroups: net.lang.c
Subject: Re: Falsies (Burroughs large systems)
Message-ID: <562@unisoft.UUCP>
Date: Mon, 9-Sep-85 11:54:13 EDT
Article-I.D.: unisoft.562
Posted: Mon Sep  9 11:54:13 1985
Date-Received: Thu, 12-Sep-85 23:22:50 EDT
References: <1288@brl-tgr.ARPA>
Organization: UniSoft Systems, Berkeley
Lines: 19

<oog>
	The Burroughs Large Systems Architecture (B5900/6X00/7X00 etc) is
programmed in Algol and its dialects .... no assembler is available from
Burroughs for them (of course we wrote one ....) this is mainly because their
architecture has no true memory protection (ie protecting one process from
another), they depend on the compilers only making 'safe' code. Of course if
you want to do system work you write an 'unsafe' compiler and protect it.

	The architecture supports 3 branch instructions

		BRANCH		unconditionally
		BRANCHTRUE	remove the word on the top of stack and
				branch if the lower bit is set
		BRANCHFALSE	remove the word on the top of stack and
				branch if the lower bit is clear


		Paul Campbell
		..!ucbvax!unisoft!paul