Anyone still have good 6561-101 chips ?

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ViperSan
Vic 20 Hobbyist
Posts: 108
Joined: Wed Apr 20, 2005 6:16 pm

Anyone still have good 6561-101 chips ?

Postby ViperSan » Sun Jul 30, 2017 9:18 am

I recently pulled out of the loft and old VIC20 unit ..which didn't power up on account the rocker switch was faulty ..
I found one on an old board and switched it out ..
The Vic20 now powers up to a cyan border with garbage on screen ..
multicoloured and flickering ..
From my previous repairs in the past this is usually a faulty VIC chip ..but it's been many years since I repaired one.
Does anyone still have working chips (PAL) 6561-101 to sell ?
rgds
vipersan

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mrr19121970
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Joined: Tue Jan 19, 2016 9:22 am
Location: Germany
Occupation: IT service manager

Re: Anyone still have good 6561-101 chips ?

Postby mrr19121970 » Sun Jul 30, 2017 10:28 am

I have some, but you are describing faulty RAM

viewtopic.php?f=3&t=7975

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ViperSan
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Posts: 108
Joined: Wed Apr 20, 2005 6:16 pm

Re: Anyone still have good 6561-101 chips ?

Postby ViperSan » Sun Jul 30, 2017 10:33 am

Thanks for that ...
As I said ..
not opened a VIC for over 15 years so brain a little foggy ..
How much for a VIC anyway ..as I have 2 workers so it wouldn't hurt to have a spare chip..
..even if I pin down the faulty ram ..
I guess I'll have to fit a full set of bases and start swapping ..
most likely the screen memory area perhaps ?
rgds
vipersan

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ViperSan
Vic 20 Hobbyist
Posts: 108
Joined: Wed Apr 20, 2005 6:16 pm

Re: Anyone still have good 6561-101 chips ?

Postby ViperSan » Sun Jul 30, 2017 12:40 pm

I may just retrofit some IC bases in my oldest working VIC (made in Germany WGB SN 66319) 9Volt AC psu ...that way I can test some chips going forward ..


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