Partially functional Plus/4

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Corsair24x2
Vic 20 Newbie
Posts: 14
Joined: Sun Sep 12, 2010 2:44 pm

Partially functional Plus/4

Post by Corsair24x2 »

Allright guys, 15 years ago I bought a Plus/4 at a garage sale for five bucks, and i finally got on ebay and bought a power supply for it. So, I get it all hooked up using my c-128 setup.....

I get the purple-bordered screen with a white background and black text that I have never seen before! Commodore basic 3.5....60671 bytes free...

and three @ across the screen in a diaganol pattern.....everything else appears fine, so I press F1 to access the built in software...and then this:

(black screen, black border, yellow text, three @ still there)

break
pc sr ac xr yr sp
;1d43 32 08 00 00 rr

So, what could be happening? Any poke codes I can use to check the rest?
-= Corsair24x2 - In 8-Bit Mode! =-
Corsair24x2
Vic 20 Newbie
Posts: 14
Joined: Sun Sep 12, 2010 2:44 pm

Further Troubleshooting

Post by Corsair24x2 »

Upon disassembly, it looks like Capicitator on the bottom side of IC UT2 is damaged.

I pushed in some of the ICs, thinking after years they might have come loose from their sockets, and when I rebooted, one of the @ artifacts was gone. I attempted to load the built in software, but it failed again and then the @ artifact returned, this time blinking!
-= Corsair24x2 - In 8-Bit Mode! =-
channelmaniac
Vic 20 Hobbyist
Posts: 105
Joined: Tue Jun 17, 2008 8:21 pm

Post by channelmaniac »

Sounds like failed RAM...
Call me a cheap bastard... I learned to fix things to save money... even surface mount soldering...

Visit my website: http://www.arcadecomponents.com
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