Re: To: Bryan Parkoff

["Bryan Parkoff" <nospam@nospam.com>]

Rich,

    MPU is the same as CPU.  It stands for microprocessor unit as central 
processor unit.  I believe that MPU was used in 1970s when it was renamed to 
CPU in 1980s according to my understanding and opinion.  I always refer MPU 
from Apple II technicial articles including Jim Sather's manual.
    I wrote a complete MPU6502 emulator which it has cycle by cycle unlike 
other emulators use instruction by instruction.  The first Apple II+ with 
MPU6502 ran at 1MHz, 2MHz, 4MHz and 8MHz on my Xeon Pentium III 550MHz 
according to my test.  Hopefully, it runs faster on Pentium IV and later.  I 
will try to compare cycle by cycle emulator and instruction by instruction 
emulator which one of them may run faster or slower, but I claim that it 
seems to be the same according to my theory.
    I concentrate to work 6502 debug since I have completed MPU6502.  This 
6502 debug has two options.  Two options are the cycle by cycle and 
instruction by instruction.
    I do not have my own home webpage.  I plan to build it probably next 
year or so.  My hobby is involved in C/C++ language and assembly language 
and electronic information.  Most assembly programmers claim that they are 
no longer write assembly languages while their time is wasting because it 
may run slower on Pentium IV and future processors.  If they attempt to 
optimize by their own hand, it will never optimize properly on Pentium IV 
and future processors.  They said that they prefer to stick with Intel C/C++ 
Compiler 7.0 or later which it can optimize C/C++ codes better than assembly 
language.  It is what Intel encourage them to do this.
    I have no opinion what Intel and the assembly programmers think, but 
assembly language may be necessary for device drivers only and also it can 
be used for earlier processors such as 80386 or 80486 for optimization by 
hand.  I am sure that C/C++ language can do its good job for speed 
(optimization).  It is what I am using C++ source code mostly, but I still 
use C style and C keyword in C++ source code.
    Please feel free to ask questions.

Bryan Parkoff
<aiiadict@gmail.com> wrote in message 
1113613917.909759.48600@f14g2000cwb.googlegroups.com">news:1113613917.909759.48600@f14g2000cwb.googlegroups.com...
> Bryan,
>
> Do you have a website?  I often wonder what you are up
> to with your hobbies.  I get the impression you are
> writing an emulator, with all of the technical questions
> you ask.
>
> What is MPU6502?
>
> Rich
>