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G-Fellow
Account closed
Registered: Jan 2004
Posts: 103 |
Available again: the 6502 microprocessor
The 6502 microprocessor now available from WDC (Western Design Center) and modernized. Now clock frequency up to 14 MHz (instead of 1 MHz as in the original). Would beat now the Amiga in speed.
He is expected to cost about 6 .
German original URL at heise.de : http://tinyurl.com/7qv6k6k
URL translated with google translator to english: http://tinyurl.com/6ng7ocs |
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chatGPZ
Registered: Dec 2001
Posts: 11092 |
yes thats possible.... there was such a circuit published in 64er mag back in the days. or maybe some other mag =) |
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terric
Account closed
Registered: Feb 2009
Posts: 47 |
Now that $00 and $01 adress is memory, yes ?
So when an instruction reads from adress 0 or 1 it reads from cpu ram ?
Not sure why i would want to have a 6510 compatible 14mhz cpu in the c64 but i actually thinking of ordering some of those cpus. Maybe one of those cool to do projects but newer used later on.
Do i want a c64 with loads of cpu time?
The vic20 has a 6502 :)
terric |
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chatGPZ
Registered: Dec 2001
Posts: 11092 |
"Now that $00 and $01 adress is memory, yes ?
So when an instruction reads from adress 0 or 1 it reads from cpu ram ?"
no, its an i/o port, not ram. and writes to 00/01 can not be "seen" outside the cpu (normally). |
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Skate
Registered: Jul 2003
Posts: 490 |
@Groepaz: Thanks for the answer. |
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JackAsser
Registered: Jun 2002
Posts: 1987 |
Also forget about illegal opcodes and demo watching. |
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ready.
Registered: Feb 2003
Posts: 441 |
maybe replace the 6502 inside the drive. |
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Skate
Registered: Jul 2003
Posts: 490 |
I checked the chip's documentation:
http://www.westerndesigncenter.com/wdc/documentation/w65c02s.pdf
Yes, classic 6502/6510 illegal opcodes don't seem to be existed. But this chip has some new opcodes very similar to 65816 extended opcodes. Weird thing is (maybe a simple documentation mistake), PLX and PLY are marked as new instructions while PHX and PHY aren't marked as if they already existed.
W65C02S6TPG-14 seems to be somewhere between 6502 and 65816 since it doesn't cover all 65816 extended instructions. |
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terric
Account closed
Registered: Feb 2009
Posts: 47 |
Yes, even if i could implement a io-register with some logics outside cpu, there still are plenty of "bottlenecks" to deal with when cpu run at 14mhz.
You have to speed down the cpu, (and there is no cache in the cpu to benefit in long small loops)
I need funding and lots of intrest to continue. :)
Just some more thoughts.
terric |
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Tao
Registered: Aug 2002
Posts: 115 |
Would be cool for use with C*Base though :)
(Since I don't have a SuperCPU -- though I'd be willing to buy one if someone want to part with theirs; same thing goes for RAMLink and SwiftLink/Turbo232). |
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chatGPZ
Registered: Dec 2001
Posts: 11092 |
Quote:while PHX and PHY aren't marked as if they already existed.
its a 65C02 after all -> http://www.oxyron.de/html/opcodesc02.html |
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