Path: utzoo!attcan!uunet!aplcen!uakari.primate.wisc.edu!zaphod.mps.ohio-state.edu!rpi!crdgw1!ge-dab!speedway!potter From: potter@speedway.DAB.GE.COM (Jeff Potter) Newsgroups: comp.sys.atari.8bit Subject: Re: 6502 error conditions Message-ID: <5841@ge-dab.GE.COM> Date: 21 Sep 90 21:37:31 GMT References: <1990Sep19.171649.20159@ingres.Ingres.COM> <5501@harrier.ukc.ac.uk> <15061@rouge.usl.edu> Sender: news@ge-dab.GE.COM Reply-To: potter@ge-dab.ge.com (Jeff Potter) Distribution: comp Organization: GE Simulation & Control Systems Dept., Daytona Beach, FL Lines: 11 There was an op code on the old Motorola 6800 named HCF (for halt and catch fire). It stopped all other operations, reset the PC, and started accessing memory sequentially (from $0000 to $FFFF) at its maximum speed. Supposedly Motorola designed it as a test feature. No such thing carried over onto the 6502, though. -- ======================================================= Jeff Potter ...potter@ge-dab.ge.com ...mcnc!codas!ge-dab.GE.COM!potter