Hans-Peter Diettrich wrote:
Tomas Hajny schrieb:
The Intel x86 (and thus also Pentium) opcodes like "AAD" ("ASCII
adjust before division"), etc., suggest some dependency, but I admit
that I didn't try to analyze what results it would have with EBCDIC.
BCD values are stored as "nibbles" (4 bit binary values), which are
independent from character codes. A nibble happens to represent the low
4 bits of the digits, in both ASCII and EBCDIC.
In any event, I'd not expect somebody who'd spent their career focussed
on mainframes to be sufficiently familiar with x86 assembler to be able
to make informed criticism at this level of detail. Similarly I'd not
expect somebody who'd spent their career focussed on PCs to be able to
make informed criticism of mainframe I/O architecture and the claimed
throughput levels.
As I've already said, there's a lot of disinformation been disseminated,
and I think it behooves both sides to admit that both mainframes and PCs
(and their derivatives, which appear to include everything from large
servers down to smartphones) have their place and aren't going away.
--
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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