R800 information

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Van BiFi

Enlighted (4348)

afbeelding van BiFi

24-09-2004, 07:23

I forsee the risc of a cisc-flamewar SmileI hope this will quiet things down. Wink At least for a short time. Smile

I guess I forgot to mention the R800 is a RISC processor... Stupid me! TongueNaah, it's not. Every smart person knows that R800 is CISC. TongueI guess that probably leaves you out then? Wink Tongue

Come on guys, please stop this fight whether or not the R800 is a RISC or CISC processor. I know no other processor doing things 8 times as fast with just 2 times the operation frequency.

Van [D-Tail]

Ascended (8254)

afbeelding van [D-Tail]

24-09-2004, 08:46

Well, then just leave it like this: the R800 is a good processor. No-one will decline that Smile

Van BiFi

Enlighted (4348)

afbeelding van BiFi

24-09-2004, 09:06

Amen. Smile

Van dhau

Paragon (1570)

afbeelding van dhau

24-09-2004, 15:07

Z80A is better, it's the real deal!

Van anonymous

incognito ergo sum (116)

afbeelding van anonymous

24-09-2004, 15:08

The real deal of what? It all started with the 8080 anyway! Tongue

Van dhau

Paragon (1570)

afbeelding van dhau

24-09-2004, 16:23

Sacrilege! Intel! Call the guards!

Van [D-Tail]

Ascended (8254)

afbeelding van [D-Tail]

24-09-2004, 17:20

But the R800 is CISC anyways Tongue

RISC is big endian TongueTongueTongue

Van idrougge

Resident (44)

afbeelding van idrougge

24-09-2004, 17:31

The r800 the little brother from the R8000 (used in the silicon grafix machines)

Little brother in what name? In name?
There is no connection whatsoever between the MIPS architecture (of which R8000 is one implementation) and the R800 (Z80 descendant).
If the R800 is code-compatible with the Z80, how in the world could it be the little brother of ten years younger RISC architecture, or of a processor which was released several years later? That would imply that the R8000 designers would all of a sudden have taken inspiration from a several years older Z80 clone, instead of the R8000's predecessors (R3000, R4000, etc) or from contemporary RISC designs.
Don't make me laugh.

Van idrougge

Resident (44)

afbeelding van idrougge

24-09-2004, 17:33

RISC is big endian TongueTongueTongue

Actually, most modern RISC processors can swap endians.

Van idrougge

Resident (44)

afbeelding van idrougge

24-09-2004, 17:36

I wrote a detailed description of R800 for the Wikipedia, most of this information I gathered while making some projects using VHDL and FPGA. I hope you enjoy the info.

Very interesting. One remark, though: You write on several instances ULA (undedicated logic array) when you mean (or don't you?) ALU (arithmetic logic unit).

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