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Dear All,
recently lotsa retro thingemagic in my house starts breaking up :(
C64 and c128 both suffered from quality loss in picture.
Now all of a sudden it works again (with c64...didnt test the c128 yet).
While testing joystick refused to make the sprite move up, other directions no problem :(
Other joystick, same problem.
Seems to me problem is in the machine.
Please help me identify which ic to check.
Thnxx,
PymerOne.
If I am not mistaken, the CIA chip 6526 handles the joystick port. I believe there are 2. I would check both. The 6526 is still available, check the net. I would download a schematic as well to identify any damaged lines.
yep does sound like the 6526.you might also want to check your power supply,yes i know its tedius but worth it.
Have you also checked the pins in the joystick ports?
Dear All,
i did a few quick checks:
few joysticks, few psu's, a few pieces of software.
All joysticks worked OK in port1, tested these with both psu's.
None of the joysticks reports "up signal" when in port2...regardless of which psu is used.
btw, tested port 1 with DRUID, tested port 2 with Flash Gordon and leviathan/legend of kage.
lateron i typed this snippet of code which clearly showed me up on port 2 was not available.
Soooo...next step is check for portpins missing/unconnected, caps exploded, tracks burned or cia 6526 chips in distress.Code:
10 print chr$(147)
20 print "port 1 : "peek(56321),"port 2 : "peek(56320)chr$(19)
30 goto 20
Too bad i am messing up seasons...this should be winterfun, so i could play outside in summer.
Thanxx all sofar for your great technical assistance :)
Grtz, PymerOne.
Just swap the CIAs. If the joystick starts working, then the other is broken. Saves you the trouble of checking burnt lines. The other CIA affects other areas of the C64 so if you exoerience other weird behavior that's another pointer to CIA being bad.
Dear All,
much to my disgust, most chips (including both 6526) in my C64 are surface mounted :(
I am gone have to find me another machine.
Thanxx again All for helping :)
Grtz, PymerOne.
dont throw it away if theres still working parts on it(not that you will)because de-soldering the through hole parts isent that difficult if youve got a soldering iron.
Quote:
Originally Posted by roy_bates
Soldering iron and a bit of solder braid is all thats needed, and a tad of patience ofcourse...;)
Quote:
Originally Posted by AmiNeoQuote:
Originally Posted by roy_bates
Soldering iron and a bit of solder braid is all thats needed, and a tad of patience ofcourse...;)
yep,agreed you never know when youll need those parts:)