Re: A86: What C-compilers have we got? [82/83/83+/85/86]

[Prev][Next][Index][Thread]

Re: A86: What C-compilers have we got? [82/83/83+/85/86]


>Only two registers?  Perhaps it has been a while since doing any 86
>programming, but I could swear I use a lot more than two registers in my
>programs...

It is true there are more than 2 registers on the z80, but you can 
only do math with two of them: HL(Address), and A (Accumulator).. you 
can increment/decrement the others, but that is different than doing 
add/sub/or/xor/and/etc operations, the other registers are required 
as counters in certain loops (commonly B or BC), so the inc/dec were 
required to work with all registers.

>I love the z80 instruction set!  (of course, it's also the only one that
>makes any sense to me...)  68k looks like it was invented by a demon.
>
>Cassady Roop

I agree the mnemonics for the z80 look a bit better not to mention 
being a smaller set, but 68k has a much better implemented 
instruction set, with a complete set of ops which can be used on 
practically every register the 68000 chip has (you aren't limited 
strictly to A and HL, you can use all the data and address registers 
for math, although there is the obvious, you can't add an address and 
a data reg, and then put it into a data reg... although I may be 
mistaken)

-Krev
-- 
----
"Science describes how our universe reacts in a mathematical 
representation of it, but can be described in regular terms. These 
terms seem to infringe on Religion's role of describing the creation, 
and once Science finds a clue to the creation, Religion declares 
Science a heretic. Religion scolds Science, telling it to stick to 
doing what it does best. To this, Science laughs and complies, going 
after the creation once again. Wouldn't it be fair to listen to the 
fact that these humans could have been a product of the Creator just 
as we are, Borak?" - Cyander, Day for the Xenith: Xenith Dawn 

_________________________________________________________
Do You Yahoo!?
Get your free @yahoo.com address at http://mail.yahoo.com
References: