How do I know all thrown exceptions of a function?

Darren New dnew at san.rr.com
Sat Feb 3 19:22:47 EST 2001


Sean Reifschneider wrote:
> For those who don't recall, HCF is
> the mythical Halt and Catch Fire opcode. 

It's not mythical. It's one of the undocumented opcodes in a 6502,
presumedly for testing during manufacturing. When you execute the HCF
opcode, the chip starts cycling all the address lines, just counting thru
all 65536 patterns, until you remove power. The person who discovered it
assumed it was used before the chip was bonded into the carrier.  I think
all this was described in Byte back when mainstream programmers cared about
6502s.

-- 
Darren New / Senior MTS & Free Radical / Invisible Worlds Inc.
San Diego, CA, USA (PST).  Cryptokeys on demand.
                 Ignorance can be cured. Naivety cures itself.



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