-----Oorspronkelijk bericht-----
Van: Jun-Sung Kim <[EMAIL PROTECTED]>
Aan: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Datum: zaterdag 20 juni 1998 4:27
Onderwerp: Re: Turbo R?
:> Another question... I'm interested on the Z380 project, but I have readed
:> that, when the japanese companies planned to make the MSX2 (there are a
few
:> years!), they want to use the Z380... Is Z380 an old chip? Is a good
choice?
:>
: Z380 is the only choice. It is the faster Z80 with enhanced instructions.
The Z380 is quite old now indeed, it was released some years ago.
The Z380 is, also while using the old instructions, faster then the R800.
Why? Well, it seems not very logical to me that a lot of people want to
build a new MSX with the Z380-processor if the Z380 wasn't a lot faster.
Also, the Z380 runs on 18Mhz, and the R800 at 7Mhz. So the Z380 is already
2.5 times faster than the R800, plus that there can be implented some
cache-memory, which will "speed up" the processor even more. Or actually
decrease the number of waits.
:> Will be faster the Z380 than the R800? If is faster than the R800, it
will
:> be faster enough to allow the R800 emulation (for TR compatibility)?
:>
: Current Z380 works at 18MHz which corresponds to 7MHz of Turbo R.
:However, the fastest instruction of Z380 needs two clocks(9MHz) as I
remember.
:Therefore, if you use only the fastest instructions, Z380 is slightly
faster
:than R800.
As I said before, I have my doubts about that.
: If 40MHz Z380 comes out, Z380 rules! I don't know when it will come out
and
:if it will or not.
I think that if you want a 40MHz-computer, you'd better buy a PC.
: I think the emulation of R800 is not good way. Even with 40MHz Z380, we
cannot
:obtain the R800 speed. Turbo R compatible will be impossible.
Isn't the Z380 instruction-compatible with the R800? Then the only
nessacarity is to emulate the turboR-special BIOS-routines (RAM/ROM-modes,
PCM-sampling etc.) to "emulate" a turboR.
:> And... what about omega project? I have emailed with Rafael Corrales, who
:> works in the Z380 project, and it seems to work good, but I have heard
:> nothing about Omega Project.
:>
:
: As I remember, the Omega project uses Z382 which uses I/O ports
internally.
:I doubt it is possible to make MSX compatible machine with Z382.
Me too. Why? Read it at the SOLiD-homepage, the URL can be found at the MSX
Resource Center.
: A lot of projects were announced. Jupiter project, Omega project,
:MSX380 project, MMSX project, Genesis project... However,
:
: None of them is realized. Or they don't want to inform the progress?
As I told before, there is some big project running. Willem Cazander of
Paragon and HPN are some of the people who are working on it. This project
is very promising and has a very good chance to be finished.
was it for now, CA!
~Grauw
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