Apple II

Hello everybody.

Could someone please help me and give some hints ?

After years of unuse I am now restoring an old APPLE ][ plus, RFI Revision "D".  When I put in the DISK ][ Interface (650-X104-) it works, but I see some vertical lines on the screen. Have a look at the foto please. These lines become darker if the drive motor spins and are colmpletely gone if I pull out the interface.

I had to replace a few RAM chips (4116) and one ROM was gone but now, ROM, RAM and PROMS on the DISK interface all test good.

I have a 48k Apple ][+ with a Z80 and ROM switch card (with original Apple ][ ROMs installed on the card), however, I do not have a language card at the moment. The computer works for the most part, but every so often, it gives me some graphical glitches. It's usually fine for the first hour or so, but after a while, it would lose horizontal sync when I hit certain keys (mostly the space bar). The effects were temporary at first, but eventually, the picture would cut out completely or come back with random characters on the screen.

Recently, I got an Apple ][ Plus in externally decent condition, but internally not so great (lots of dirt and debris, some corrosion on the motherboard).  I've replaced the motherboard (tested to work, and boots).  The old motherboard has no video signal whatsoever, no beep (did beep for a bit, but then stopped).  Unfortunately, the Keyboard had been plugged into it backward (something that I didn't realize until I tried using it as a guide on the new motherboard).  The new board still boots.  But most of the keys didn't work (mostly the letters).