Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site unisoft.UUCP Path: utzoo!linus!philabs!cmcl2!seismo!umcp-cs!gymble!lll-crg!dual!unisoft!paul From: paul@unisoft.UUCP (Paul Campbell) Newsgroups: net.micro.apple Subject: Re: Re: Undocumented 6502 Opcodes Message-ID: <419@unisoft.UUCP> Date: Sun, 10-Mar-85 15:19:51 EST Article-I.D.: unisoft.419 Posted: Sun Mar 10 15:19:51 1985 Date-Received: Tue, 12-Mar-85 20:53:25 EST References: <9@zurton.UUCP> <381@utai.UUCP>, <139@cvl.UUCP> Organization: UniSoft Corp., Berkeley Lines: 9Seriously this time .... the 6800 has a similar opcode which is in there for chip testing ... when you execute it the chip goes into a strange mode where its microcode loops cycling its address lines thru the whole address space reading all of memory. The only way of getting out of this is to reset the chip, maybe the HCF instruction is similar? Paul Campbell ucbvax!unisoft!paul