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- Xref: sparky comp.sys.sun.misc:3730 alt.folklore.computers:12659
- Path: sparky!uunet!mcsun!uknet!axion!newsserver!bear!jcs
- From: jcs@zoo.bt.co.uk (John C Sager)
- Newsgroups: comp.sys.sun.misc,alt.folklore.computers
- Subject: Re: what is halt_and_catch_fire?
- Message-ID: <1992Aug17.132819.29817@zoo.bt.co.uk>
- Date: 17 Aug 92 13:28:19 GMT
- References: <1992Aug14.181623.16695@exlog.com>
- Sender: jcs@bear (John C Sager)
- Organization: British Telecommunications plc
- Lines: 25
-
- In <1992Aug14.181623.16695@exlog.com>,
- mcdowell@exloghou.exlog.com (Steve McDowell) writes:
-
- > Out of idle curiosity more than anything, can anyone tell me
- > what calls the _halt_and_catch_fire() routine in locore.o?
-
- > What does this routine do? A quick poke at it with adb leaves
- > me terribly confused, as it seems to be an endless loop that
- > adds adds 2 meaningless numbers.
-
- > Anybody?
-
- Dunno why SunOS should have this, though it's not in the sun4 (Sparc) version.
-
- I was told once that one of the unused opcodes on the original Motorola 6800
- would put the processor into a halt mode in such a way that a particular
- part of the chip got very hot & burned out, and this was called, jokingly,
- halt-and-catch-fire. It may however be apocryphal.
- Any comment out there??
-
- John C Sager Mail: B67 G18, BT Labs
- Email: jcs@zoo.bt.co.uk Martlesham Heath
- Tel: +44 473 642623 IPSWICH IP5 7RE
- Fax: +44 473 637614 England
-
-