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Without seeing the dies though its all speculation

i agree .

So I guess it could be seen as a 1phase 21Mhz or a 2Phase 10Mhz

Ah, not false, I did not see the SA-1 like that but it does not sound illogical.

ok, thanks for explanations, and it's not the case for SA-1 ??

and then call it a 1 phase as far as the external circuity is concerned??

Yes i call it a 1 phase because RAM accesses can be close to the CPU frequency(so close to 1 cycle per access), and not a 1/2 cycle like the 65xxx standard .

i heard somewhere that the SA-1 is a 1 phase CPU, is this true ??

So the PCE uses 7MHz RAM? I don't think I'm understanding this correctly... Yes it use 120ns SRAM,else it would have needed 60ns . Then again, I can't think of a single appliance or whatnot that couldn't get by with a 1MHz Z80. Of course a 1mhz Z80 would be very slow, but this processor was intende...

Probably you could get a 65816 @5 Mhz back in time (as the PCE was able a 6502 @7Mhz with some modification) but there is no point in doing that if you can't get the ROM working at that speed. In fact ROM cost was the big deal here (not only the RAM). Doing a 1 phase 65816 is not like an overclocki...

I'm even surprised that you choose a 1.79 mhz vs a 8mhz Z80 to be sure to be right . The hu6280 destroy litteraly your 8mhz Z80 even with your crappy code examples, and it's a fact, why you don't take this in account ??,not easy here right ?? It's "not easy here" to obtain a HuC6280-based...

A spectrum guy compared some years ago the C64's 6502 @1mhz and the 3.5 mhz in the spectrum . The two CPU was close,and overal the Z80 was ahead(not by far) by his frequency . But if his tests were done with the nes or A8's CPU (which run @1.79 mhz) no way for a 3.5mhz Z80 to win . It's often common...

And you are the one bringing the subject back... i don't want to open the war again about it but honestly I've absolutely no problem to discuss and debate about it wherever you want :p But you have lunched it on sega-16, why not here ?? And it's not a war,i thing we are grown enough to be gentle ev...

The thread you started is not if a 1.79mhz 6502 vs a 8mhz Z80 would compete (because it's obvious it cannot) but "Let's compare 65x CPU architecture vs 68000 (or others)" I'm even surprised that you choose a 1.79 mhz vs a 8mhz Z80 to be sure to be right . The hu6280 destroy litteraly your ...

Waho, i missed this

impressive stuff .

My statement on sampled audio size, was not to criticize the demo or if it's real time or not . Its just for pointing the fact that if you want quality samples, you must spend a big bunch of ROM, nothing else . :D It's obvius that OD2 use some big prerender tables in ROM, you cannot do complex math ...

if i recall correctly, OD2 music consume 3.2Mbytes of rom space(the entire demo is 8Mbytes) .
It's 2 minutes of 8bit 26.5khz samples .

I think it's just done like the colony stages in Metamor Jupiter of the PCE. The shading part could be just palette change (I remember in Metamor Jupiter only colour 0 was changed, but probably the whole subpalette was updated for each "face" in that SFC R-Type game) or maybe transparency...

You're right, it's so discreet, i didn't notice.

Ok,I thought it was a little bit complex to be done with only vscroll .