Author Topic: Does anyone have more information on 6 MHz CPC?  (Read 3446 times)

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Offline 1024MAK

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Re: Does anyone have more information on 6 MHz CPC?
« Reply #25 on: 20:42, 16 February 16 »
A better way of wording it is:-
You CPC may work with the higher speed crystal if the rest of the ICs are able to operate at this speed.


It would not be hard to work out if the DRAM chips are suitable, as the access time is in published data sheets. With the custom Amstrad ICs, it is rather harder to judge.


Mark
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Offline TFM

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Re: Does anyone have more information on 6 MHz CPC?
« Reply #26 on: 20:45, 16 February 16 »
2. TFM added this 16% or 50 % rather than correct it to 50%. And he is saying that he did not make this change (or play foul to elude that fact that he overreact to any comment on his work)


Stop lying around! Fano added that! As great as your hardware is, as small your social skills are. Proof here:


Difference between revisions of "6 MHz CPC" - CPCWiki
Difference between revisions of "6 MHz CPC" - CPCWiki
TFM of FutureSoft
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Offline 1024MAK

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Re: Does anyone have more information on 6 MHz CPC?
« Reply #27 on: 20:47, 16 February 16 »
It's 50% or nothing (ie crash). And crash will be visible quite soon.
Symptoms of the hardware not being happy are more likely failure to properly intialise to the start up screen.
Or symptoms similar to a RAM fault.

Mark
Looking forward to summer in Somerset :-)

Offline TFM

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Re: Does anyone have more information on 6 MHz CPC?
« Reply #28 on: 20:48, 16 February 16 »
Symptoms of the hardware not being happy are more likely failure to properly intialise to the start up screen.
Or symptoms similar to a RAM fault.

Mark


Exactly, that's my personal experience too.
TFM of FutureSoft
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Offline 1024MAK

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Re: Does anyone have more information on 6 MHz CPC?
« Reply #29 on: 20:50, 16 February 16 »
And does it really matter who edited the wiki?

IMHO, it's more important to correct it. Not to argue about it.

Mark
Looking forward to summer in Somerset :-)

Offline gerald

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Re: Does anyone have more information on 6 MHz CPC?
« Reply #30 on: 21:03, 16 February 16 »

Stop lying around! Fano added that! As great as your hardware is, as small your social skills are. Proof here:


Difference between revisions of "6 MHz CPC" - CPCWiki
Difference between revisions of "6 MHz CPC" - CPCWiki
please define "that",
I cannot see anything that looks like "Some CPCs (manufactured with fast DRAMs)show a increase speed by 50%" in this link ....

Offline andycadley

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Re: Does anyone have more information on 6 MHz CPC?
« Reply #31 on: 21:36, 16 February 16 »
One day I'm going to get everyone from this forum into a room and we're all going to have a group hug. One that lasts just ever so slightly too long to be comfortable.

Just sayin'

Offline SRS

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Re: Does anyone have more information on 6 MHz CPC?
« Reply #32 on: 22:05, 16 February 16 »
One day I'm going to get everyone from this forum into a room and we're all going to have a group hug. One that lasts just ever so slightly too long to be comfortable.

Just sayin'

I'll stay outside and watch that all inside make their kindergarten-diploma before leaving ...  By the power of Greyskull!



BTW: is this c64 or cpc palette ? *lol*
« Last Edit: 22:09, 16 February 16 by SRS »

Offline Docent

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Re: Does anyone have more information on 6 MHz CPC?
« Reply #33 on: 23:00, 16 February 16 »
please define "that",
I cannot see anything that looks like "Some CPCs (manufactured with fast DRAMs)show a increase speed by 50%" in this link ....
This is the correct link: Difference between revisions of "6 MHz CPC" - CPCWiki
Difference between revisions of "6 MHz CPC" - CPCWiki

Offline SRS

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Re: Does anyone have more information on 6 MHz CPC?
« Reply #34 on: 23:39, 16 February 16 »
From my point of view ...

TFM wrote the "some ... 50%", which is correct. 16,x% was from Fano. Which seems not correct to most of us.

Either it is 50% or it crashes.

So if you define SOME as 0,1 to 100 %, it is correct.PulkoMandystated this earlier. SOME will work 50% faster, SOME will crash. NO ONE will work at 16,6xxx ... until you proof it.

No reason to get picky on each other ... go back to lab and gimme a 4 GHz CPC !

SO - delete "fast DRAM" and "16,xx" from WIKI and the text will be more correct
« Last Edit: 23:47, 16 February 16 by SRS »

Offline TFM

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Re: Does anyone have more information on 6 MHz CPC?
« Reply #35 on: 23:48, 16 February 16 »
From my point of view ...

TFM wrote the "some ... 50%", which is correct. 16,x% was from Fano. Which seems not correct to most of us.

Either it is 50% or it crashes.

So if you define SOME as 0,1 to 100 %, it is correct.PulkoMandystated this earlier. SOME will work 50% faster, SOME will crash. NO ONE will work at 16,6xxx ... until you proof it.

No reason to get picky on each other ... go back to lab and gimme a 4 GHz CPC !

SO - delete "fast DRAM" and "16,xx" from WIKI and the text will be more correct


That's absolutely right. And I got no idea if different CPCs used different RAM chips or not, it may be one issue, the GA or CRTC may be another one. Ok, working on the 4 GHz CPC now... tell you first results in 2086 or so.  ;)
TFM of FutureSoft
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Offline ukmarkh

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Re: Does anyone have more information on 6 MHz CPC?
« Reply #36 on: 23:50, 16 February 16 »
I'm sure if we all met for a beer, we'd laff about all this, and design a super CPC  :laugh:

Offline gerald

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Re: Does anyone have more information on 6 MHz CPC?
« Reply #37 on: 00:29, 17 February 16 »
TFM wrote the "some ... 50%", which is correct. 16,x% was from Fano. Which seems not correct to most of us.
No, TFM changed
Code: [Select]
This speed improvement is 16.66667%.This has been tested with this simple programto
Code: [Select]
Some CPCs (manufactured with fast DRAMs) show a increase of speed by 50% (verified with at least one CPC6128 produced 1987).
 In case of the older DRAM type the speed improvement is only 16.7%
While he should have just change to
Code: [Select]
This speed improvement is 50%.This has been tested with this simple program (verified with one CPC6128)
Everything else is just wrong.
And this section is not discussing the success rate of the modification.

And I got no idea if different CPCs used different RAM chips or not, it may be one issue, the GA or CRTC may be another one.
You got no idea, but by stating that it gives 50% more speed on CPC with faster DRAM and also stating that slower DRAM will result in less performance gain, you just build a theory to explain why fano get on 17% :
- my cpc has fast DRAM and can run 50%. Fano only get 17% so he must have slower DRAM.

CPC use 200ns / 150ns or even 120ns, but you can check on the motherboard page that the speed in not function of production year.
150ns can be found on early 464 as well as pre-asic 6128. 120ns is mainly use on the plus range.

Now, let fix that page do something more interesting  ;)




Offline SRS

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Re: Does anyone have more information on 6 MHz CPC?
« Reply #38 on: 00:35, 17 February 16 »
While he should have just change to
Code: [Select]
This speed improvement is 50%.This has been tested with this simple program (verified with one CPC6128)
Well, is there NO WIKI-Admin that could change it , now ?

Offline TFM

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Re: Does anyone have more information on 6 MHz CPC?
« Reply #39 on: 00:54, 17 February 16 »
What I changed happened in agreement with others back the day. I'm not just deleting a value which I can not prove right or wrong. Please everybody feel free to improve the article.  :)
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