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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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WVL
Registered: Mar 2002
Posts: 889 |
This just made my day :D Commodor chips \:D/ |
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Devia
Registered: Oct 2004
Posts: 401 |
LOL
Did you see an actual pic of that chip before buying? |
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taper
Registered: Dec 2001
Posts: 119 |
Quite amazing... My guess is that you can ask this firm about any chip, and they will supply whatever garbage they have in stock, with a nice printed label on (although not always correctly spelled).
However, this opens up an interesting question. Perhaps there are legitimate chip-clone factories that actually could pull it off without it costing a fortune.
The SID might be complicated, but a CIA (6526) shouldn't be THAT hard... and everyone who needs SID's and CIA chips raise a hand... (mine raised!). |
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ready.
Registered: Feb 2003
Posts: 441 |
I made some tests with the COMMODOR CSG8580
Not much to say really.
I put one into a working C64C after pulling out the original CSG8580R5.
Due to previous esperience, where the CSG8580 plugged directly into the SID socket corrupted the computer operation (system crashed and wrong displaying of char ROM), I isolated the CSG8580 with 2 octal latches (574 kind): one for the address bus (5 lines only) and one for the data bus (8 lines). Then I connected the LE (latch enable) input through a NOT gate to the SID CS (chip select) line from the C64. The CS line of the CSG8580 was grounded.
At power up no strange thing happened, only a screatching noise.
I loaded a few SIDs, but only weird noises came out, mostly sounding like a data flow though the normal SID (like some decrunching programs do)
Some facts:
- after power up a screatching noise is heard and pressing the keys modify this noise until the key is depressed, then it goes back to its original noise.
- poke54273,0 and other values shuts the noise, some others tunr it ON again
- volume register (54272+24) seems not to do much
- so far I have not been able to produce any output wave form my the screatching noise.
Supply voltage: 9V at pin 28
I have not tried with 12V, as the 6581, I was afraid of burning it.
Any suggestion is welcome!!!
The testing equipment:
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chatGPZ
Registered: Dec 2001
Posts: 11296 |
Quote:Any suggestion is welcome!!!
i suggest hitting that IC with a hammer. really. it's not a sid. it's some random asic that doesnt even work. |
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WVL
Registered: Mar 2002
Posts: 889 |
I am also clueless why you are trying to get it to work, it's crystal clear it's no SID, but just some leftover chip on which they put some markings. Pretty good chance it could even destroy your c64 actually.. just get it out ASAP.
Oh, and never buy Chinese crap again :) |
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Sander
Registered: Jan 2002
Posts: 493 |
Some Chinese ppl are having teh giggles. |
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HCL
Registered: Feb 2003
Posts: 727 |
The attached .jpg (in weirdly large size) approves that you did everything right. I would suspect the chip to be malfunctioning :P. Was i funny now? :D |
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ready.
Registered: Feb 2003
Posts: 441 |
Crap!! Sorry for the big pics, I was too tired last night and too in a hurry for uploding the pics for noticing the size.
But now it seems I can't delete them and replace them with smaller ones. I delete them from my photo album but the URL keeps showing them.
Anyway here's the link to the reduced size format:
http://images6.fotoalbum.alice.it/v/www1-6//120/120653/194171/P..
http://images5.fotoalbum.alice.it/v/www1-5//120/120653/194171/P..
http://images3.fotoalbum.alice.it/v/www1-3//120/120653/194171/P..
Ready. |
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ready.
Registered: Feb 2003
Posts: 441 |
Ok, lesson learned: DON'T BUY CHIPS FROM CHINA
but still the quest for NewOldStock Commodore chips grows bigger as time goes on and I bet there are tons of NOS Commodore chips out there just collecting dust, being considered trash by most people.
there should be a safe way to get them, but as I have seen most Chinese suppliers usually want to sell those ICs as soon as possible and try not to answer detailed questions, nor supply pictures.
The last supplier I contected was offering me various C= ICs, but when I asked for the year these ICs were produced, just went around the question.
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