Motorola 68k cpu and Hitachi 68k????

[kd7ota]

Hello,

I was only curious to what this was.

One day I was opening up a Sega Genesis console, and to my surprise, it had a Hitachi CPU?!  Which the earlier Sega Genesis console has a normal Motorola CPU in it, but im just wondering, if you were to use a Hitatchi CPU on an Amiga, would it work if it had the same pin layout?  Im sure it would be the same CPU size as the Amiga 500.

So please input your 2 cents.  And please correct me if im wrong.  :-D

[seer]

AFAIK, their the same chip. Hitachi licensed the chip;

68000

Pinout

[kd7ota]

Thanks.

I just thought maybe that would be cool to own an Amiga that had some other kind of CPU in it. :-D

[seer]

Well, you can always try a Philips 68070 :-D

[Iggy_Drougge]

There are a lot of licencees for the 68000 processor. Apart from Motorola themselves and Hitachi, SGS-Thomson and Signetics have made m68k processors, and probably other manufacturers as well. And all are compatible.

[fragment]

For example some Amiga A600s are equipped with 68000 made by ST.

[Brian]

Hmm... Philips 68070... wasn't that based on the Motorola 68010? Doubt they are compatible though...

[seer]

Hmm... Philips 68070... wasn't that based on the Motorola 68010? Doubt they are compatible though...

Information on the 68070 isn't as available as the 68000/68010, but it's a (stripped down) clone of the 68010 designed for the Philips CD-I.

Wheter it would work inside an Amiga I don't know. I don't think it would work but it was meant more as a joke.

[Crusher]

Aa.. joke or no joke, the 68070 wasn't that a computer on a chip? I.e. the 68070 is a computer and not only a CPU(though not bigger than the 68060). :-)

[Karlos]

Phillips 68070 wasn't a computer on a chip, but it did add UARTs, and various other useful hardware not found in the 68000.

However, as 68000 clones go, it wasn't that good - most instructions took more cycles to execute than they did the 68000. IIRC, things like division and muptiplication were especially bad; a genuine 68000 quotes a maximum number of cycles for these operations, typically they 'early out' as soon as the result is reached, the 68070 would grind through a fixed number of cycles (incidentally more than the maximum for the 68000).

[Brian]

So I take it that they aren't compatible right off as 68010 to 68000. That's a bit sad, would be cool to have an A500 with a 68070... "what you only have an 060? I have an 070 in my A500 ;-)"

[Crusher]

@Karlos: Ok, it was so long time ago I read about it. But it was more than just a CPU anyway. :-)

[seer]

But it was more than just a CPU anyway.


Only a little...

Some of the "support chips" support chips are interesting as well.. (I think some of these could be used to get a 68000 68070 abilties ?)

[lordv]

BTW, even Atmel now fabricates clone of 68020 chips.
Search Atmel's site forr 68020

[X-ray]

@ Brian

I like the 070 comment