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ready.
Registered: Feb 2003
Posts: 441 |
Buying Commodore ICs from China
Hello all,
just posting a story about buying Commodore ICs from Chinese suppliers. Before buying read this.
Interestingly there are suppliers that in 2006 produced fake Commodore ICs.
http://www.lemon64.com/forum/viewtopic.php?t=27739 |
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Zer0-X
Account closed
Registered: Aug 2008
Posts: 78 |
UMC made custom chip, product ID A55040S, manufactured on week 12 in 1989. |
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enigma
Registered: Feb 2002
Posts: 15 |
Nice to see the long awaited fakes arrived for extraction.
So is there any info, what these fake IC is, I couldn't find any information from the numbers on the die.
Could it kill a C64 if used as SID replacement?
So current best replacement is putting a sidplay2 core in a DSP/Microcontroller and put it piggypacked in the SID socket? :P
(flashable for emulation updates ofcourse, additional registers for choosing sid templates and full hvsc) |
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ready.
Registered: Feb 2003
Posts: 441 |
Nice to see the die. When I received the chips about one year ago, I tried to put one in the SID socket but with poor results. It gave problems to the other ICs on the bus, causing flickerings on the screen too, producing random sounds. After removal the C64 operation returned to normal.
Now, let's see if anybody can tell what this chip is from the die. |
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enthusi
Registered: May 2004
Posts: 677 |
Hmm, I dont want be neagtive but does it matter?
With respect to C64 I assume you as well solder an AMD CPU to the SID socket...
Nice combined effort here btw \o/ |
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ready.
Registered: Feb 2003
Posts: 441 |
well, at least I am interested in knowing what the chip really is. I just sent a mail to UMC asking for information about it. Not so much effort in sending an email. |
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ready.
Registered: Feb 2003
Posts: 441 |
furthermore, chances are that this chip could be a SID-clone with just a different pinout produced by somebodyelse than Commodore to avoid legal problems. The 6502 and 6501 had about this story back then. Let's see..... |
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Zer0-X
Account closed
Registered: Aug 2008
Posts: 78 |
Replaced the die image with a better one.
And there's absolutely no chance that this piece of junk would have the slightest relation to the SID.
It's just the cheap chinese getting their hands on some random chips, relabel them and sell to those who are willing to offer them some money as there isn't any real danger for them to get busted.
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chatGPZ
Registered: Dec 2001
Posts: 11350 |
it looks like a simple microcontroller to me, you can easily see the block of memory (wild guess: big block==flash or prom, small block=ram). something like a 8051 derivate or so :) |
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Stingray
Account closed
Registered: Feb 2003
Posts: 117 |
unicorn microelectronics 28pin sram??? |
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Zer0-X
Account closed
Registered: Aug 2008
Posts: 78 |
Way too much intelligence for SRAM chip. RAM chips in general look like repetitive rectangular patterns covering almost the whole silicon. |
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