On Fri, 20 Aug 1999, Carlsson, Anders wrote: > Hi, all. > > Yesterday evening, I decided to pull out my VIC-20 from the pedestal, > to check a few things I had forgotten with it. This is a session log: > > 1. My 1084S monitor (which I use with the Amiga) has trouble with > vertical sync (I think it is called - the picture is scrolling > from top to bottom) on CVBS signal when the border colour is light. > I.e. the startup cyan/white combination will scroll and colour > is gone, but if I do "POKE36879,24" to get black/white, the screen > is stable and colours re-appear. > > I opened the monitor to see if there is some knob I could adjust, > but found none. I had this monitor on service previously, as it > didn't work at all. Before I had that breakdown, CVBS signal was > OK. My service information shows a video level adjustment on the video output from the VIC chip. You may be overdriving the monitor. > 2. My 3/16/24/32K expansion card seems to finally have died. I tried > to clean the weared connectors, but without success. What can one > do to bring it back to life again, if it only is the connector > pins that are damaged? Otherwise, I'd have to build my own card > as there is a description on the net. There are several versions of these cards. You will have to do a little experimenting. You should not have to build a new card, only replace some chips. If your card has driver chips or logic decoders, check these first. A logic probe is usually necessary. Check the bank select lines and the most significant bits of the address lines. That should tell you which chips are working. - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tcm.hut.fi.
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