Fast Z80 from rabbit

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Por Leo

Paragon (1236)

Imagen del Leo

05-09-2008, 22:16

Hello all,

I just want to share some finding , today i just found this
device from rabbit.com , apparently it is a fast Z80 :

www.rabbit.com/products/rab2000/

it seems to be an enhanced Z180 with some new 16bits
instructions and running close to 30MHz.

What is interesting is that the PC (program counter) and
jumps can be done a 1mb linear space, no pages of memory.

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Por jltursan

Prophet (2619)

Imagen del jltursan

06-09-2008, 13:26

Interesting, it's not a DIP IC of course; so an adapter would be needed to simply plug it; but, would be electronically compatible?
The TurboR machines feel like a good host for this CPU; but I guess that, although it emulates the Z80, doesn't have compatibility with R800 instructions.

Por msd

Paragon (1510)

Imagen del msd

06-09-2008, 16:29

Emulates the z80?

Por Leo

Paragon (1236)

Imagen del Leo

06-09-2008, 17:04

the R800 has just 2 instructions for multiplications that Z80 has not.

An other finding :
do you know the nec V30, it is a 80186 from nec but it has a i8080
emulation mode in hardware, i saw it here :

www.pageofmarco.de/v30.php3

Por ro

Scribe (4902)

Imagen del ro

06-09-2008, 20:02

Emulates the z80? Look who woke up finally. hai Marcel Smile

Por DamageX

Master (217)

Imagen del DamageX

07-09-2008, 06:09

The eZ80 has also been around a while, and can run at 50MHz. I remember hearing from someone who got CP/M running on it.

http://www.zilog.com/products/family.asp?fam=218

The V20/V30 were used in some old PC clones and ran slightly faster than the 8088/8086. Another interesting CPU was the V60/V70 which was fully 32-bit, with 32x 32-bit registers, and floating point support. There was a V30 compatibility mode but I don't know if there was still an 8080 mode as well.

Por Leo

Paragon (1236)

Imagen del Leo

13-09-2008, 07:46

hi,

i just found a very interesting link that compares the cycles per instruction for z80,z180,z380 and kawasaki kc82 and r800 : it shows the kawasaki having the exact same speed as r800 !!!!

it seems the improvement on r800 and kc82 are the same type , not saying kc82 is a r800, but
it had the nutliply instruction there would be 0,01% difference in cycles !

morever it seems to be pin compatible with z80 !!!! so it could allow any msx to speed up,
except msx2+ with integrated z80....

cdlmaster.ld.infoseek.co.jp/d780c/z80state.htm

Por Leo

Paragon (1236)

Imagen del Leo

13-09-2008, 07:49

correction : it is not pin compatible with z80 but has same pin count as r800 ...
elm-chan.org/docs/kl5c8012_e.html

in this link the kc160 seems to be even faster, equivalent to a Z80 at 100MHz when running at 20MHz while the KC80 seem to be equivalent to a Z80 @40Hz when ruuning at 10MHz :

www.kawasho-semicon.co.jp/product/kawasaki/index.html

some figures comparable to msx :

www.yellowsoft.com/products/dhry.html

these figure arequite low as compared to dhryston.com results on msx/Tr , if i remember well...

Por Yukio

Paragon (1540)

Imagen del Yukio

13-09-2008, 11:57

Emulates the z80?

Emulation is hardware based, simulation is software based ... Older Central Processing Unit's had hardware emulation of the old xx80 series!

Por msd

Paragon (1510)

Imagen del msd

13-09-2008, 18:24

The rabbit has a z180 core.. no emulation. In your perspective even a z180 or a z380 is a z80 emulator

Por Yukio

Paragon (1540)

Imagen del Yukio

13-09-2008, 19:04

Their emulated the Intel 8080 core ... because of it their are software compatible and able to process the CP/M programs. If you take a computer book about Assembly language that has the list of op-codes it is possible to verify that only the mnemonics are different the HEX/DEC/BIN codes are identical matches .

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