Hi to repair your vic20 you can use this product: http://vic-20.de/x1541/hardware/petram.html it replaces ram and/or rom... it helped me to fix a old cbm 8032... it is clear that if the VIC is not correctly initialized you probably get a black screen. On 26/10/2016 10:33, Hegedűs István wrote: > The problem is that this is my first ever VIC20 so I have no > cartridges... The idea is however good. > Thanks > Hege > > > -----Original Message----- From: Clockmeister > Sent: Wednesday, October 26, 2016 3:00 AM > To: firstname.lastname@example.org > Subject: Re: 6561-101 > > > > On 26/10/2016 4:38 AM, Hegedűs István wrote: >> Hi, >> >> It has black screen of course. I know that the Kernal ROM or VIC used >> to be the guilty ones. I have burnt a 27c128 with Kernal but still >> have to build an adapter so I cannot 100% rule out Kernal issue. The >> guy who sold it said that the 6502 is also sick (he has tried the CPU >> in an 1541), though with oscilloscope I have seen e.g. proper phi2 >> signal coming out. I have bought some Rockwell 6502s to replace it. >> Anyway even if it turns out that VIC is good it is better to have a >> spare IC. >> I should hook up my logic analyzer to it but so far I had no time (or >> I was just too lazy). >> > > > Whilst mask ROM (and RAM for that matter) failures are common on vintage > equipment, the last two VIC-20's with a black screen that I repaired had > a bad 6561-101. > In my case both were easy to diagnose by simply plugging in a cartridge > or blind loading a game. On both occasions the game you could hear the > game playing even though there was a black screen. > > > > > > Message was sent through the cbm-hackers mailing list > > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2016-10-26 12:00:02
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