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| Is it possible Z380 board THE R800 CPU can emulate??
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elements
msx freak
Berichten: 170 |  Geplaatst: 22 Juli 2004, 13:31 |
Is it possible z380 board can emulate R800? I mean is it possible to play turbo-r software on z380 board?
Is poosible to program this tool or O.S. ?
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flyguille
msx master
Berichten: 1223 | Geplaatst: 22 Juli 2004, 14:47 |
i think the R800 is too fast as for be emulated... so, left the traps opcodes... because boths is far diferents.
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GuyveR800
msx guru
Berichten: 3048 | Geplaatst: 23 Juli 2004, 02:45 |
Z380: 2 cycle instruction minimum, 14MHz
R800: 1 cycle instruction minimum, 7MHz
In other words, Z380 is about as fast (in practice, due to R800 waitstates a bit faster) as an R800 while executing 'legacy' Z80 commands.
The power of the Z380 really kicks in when you use the extended instruction set and you realize the huge amount of memory you can access. (R800 is slow when using external memory, and even an expanded turboR has a 1MB limit)
In emulation it's hard (practically impossible) to make efficient use of the extended instruction set, so Z380 will be too slow to emulate R800 at the right speed.
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elements
msx freak
Berichten: 170 | Geplaatst: 02 Augustus 2004, 16:36 |
so if u r programmer thats means u can also built an z380 instruction in UZIX OS and MSXDOS 2.20 for the speedloading? like r800 of the turbo-r with msxview/dos 2.30?
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