Ralf A. Quint wrote:
At 11:52 AM 10/23/2011, Frank Peelo wrote:
If I recall corerctly, that Modula-2 value for nil was the address the
8086 jumped to when released from RESET. So jumping through a pointer
with value nil would be something you would notice pretty much
immediately.
Certainly not. Modula-2 was/is not depending on any CPU specifics,
certainly not on anything x86, considering that the first computers
Modula-2 ran on were the Xerox Alto and the Lilith, using M-Code, and
both not even a remote connection to anything x86. And a lot of
non-Wirth Modula-2 implementation ran on Motorola 68k before I can
remember to have seen the first x86 implementation (not sure if it was
FST or XDS)...
We're getting off-topic. I *DID* specify that it was one, particular
compiler that had that behaviour: if I recall correctly it was the first
version that Logitech targeted at OS/2 (the one that bombed when you
said BYTE(0)). I've also seen ffff:0000 used by a disassembler
(Sourcer), possibly for the same value that Frank suggests.
--
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk
[Opinions above are the author's, not those of his employers or colleagues]
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