68000

[alex]

Hello neo geo 68000 12 MHz MIPS few have compared the atari?

[dlfrsilver]

Hello neo geo 68000 12 MHz MIPS few have compared the atari?

What is the point of your question ?

The neogeo has a 68000, but it has nothing in common with the Atari ST or even STE.

The neogeo is a sprite/tile system helped by a powerful GPU. The ST is a framebuffer tied to a 68000.

Out of the processor, they have nothing in common.

[alex]

Hello I mean if you can know how many MIPS correspond to 12 MHz?

[exxos]

IMHO , I don't think the MIPS (million instructions per second) figure is meaningful figure. Instructions take various times to complete. If you were running long op codes which can take 20+ cpu cycles, then whatever the MIPS is, it would be a higher MIPS number if only running instructions which only take a few cpu cycles. I think this is why nobody is replying to your question as it does not really have a answer.

[mfro]

MIPS = Misleading Information to Promote Sale

But if you really want to know:

m68000 @ 8 MHz = about 1 MIPS
Atari Falcon = 3,84 MIPS
Atari Falcon DSP @ 32 MHz = 16 MIPS

Firebee (Freescale m5484 @ 264 MHz) : according to Freescale, up to 410 MIPS.

The last indication is a bit more meaningful since these are DMIPS (numer of instructions per second while running the Dhrystone benchmark). So this is measured using an at least somewhat meaningful program.

Freescale obviously managed to squeeze more than a single instruction/cycle out of the processor which is possible (with carefully handcrafted assembler) because of the EMAC extension.

[alex]

The 8 MHz 1 mip and 12 would be 1.5 MIPS? Greetings

[Xerus]

I think the MIPS is the least reliable benchmark for comparing the machines together; the reason is that it has evolved over time !
An example, the 68030 at 16MHz (ex. Falcon) was 3.84MIPS but then the standard has changed and Motorala said later it was 5.76MIPS...

In short, it is likely that 1MIPS of 68000 8MHz no longer necessarily true

[alex]

You can reference tables but put that to one mip to 8 MHz, so I think the 12 MHz is 1.5 or 1.7. greetings

[Hippy Dave]

The 8 MHz 1 mip and 12 would be 1.5 MIPS? Greetings

Correct. MIPS was intended to be quantitative, but is relatively qualitative.
If a program appears to be more than 5% faster or slower, then you are
probably noticing a real difference. MIPS can be calculated by taking a
guess at this point.

My definition of MIPS is to make a 32 bit square root algorithm in C,
disassemble the code for clock cycles, then time the program for
your favorite number a million times. Presto... MIPS.

Discussions about MIPS are really about freedom of speech.

[Eero Tamminen]

My definition of MIPS is to make a 32 bit square root algorithm in C,
disassemble the code for clock cycles, then time the program for
your favorite number a million times. Presto... MIPS.

My favorite binary numbers are 0 and 1.

[exxos]

The OP still does not understand why MIPS is a meaningless figure..

Someone might be able to give a better example as 68000 instruction times is not my thing.. but.. For a general easy idea.

For example :

If a "add" instruction takes 8 CPU cycles, then assuming 8mhz CPU, then 8000000 / 8 = 1000000, So the CPU can do 1,000,000 of those instructions per second. or 1 MIPS.

Now what about a DIV instruction which could take 200 CPU cycles... then 8000000 / 200 = 40000, So the CPU can do 40,000 of those instructions per second , or 0.04 MIPS

I don't know about NOP fucntion, assume it takes 1 CPU cycle, no idea, if it did take 1 cycle, then MIPS would be 8 MIPS...

So whatever the manufacture quoted MIPS, it is the max speed with the fastest instruction the CPU can possibly do. The figure is pointless.

It is like having a car which has 1,000 MPH on the speedo. Sure if you dropped the car from the sky it probably would reach that speed. But in the real world of traction, typically what ? 60-100MPH ? Of course that assumes a straight line without any gosubs for burgers & icecream and such. So more like 40mph.

If that is to complicated, then try this one.. How fast can someone run .....?