New POKEY socket installed
Thu Aug 25, 2022 10:21am

Getting the old one out was a bit of a chore but not unexpected being that it's been happily in that spot for 40 years. Thankfully awhile ago I picked up some copper solder braid and a spring loaded solder "sucker" thing. The solder sucker was a big help. I also fluxed the hell out of the pins to make sure things flowed as best as possible.

Here's an example while I was plopping the paste on. Took the picture so I didn't forget that little jumper resistor.

Socket out:

New socket in:

The new sockets are definitely cheaper quality than the one I removed. It seems to do the job though. On my first try, I got halfway through installing just to notice one of the pins were missing and had to then go through the whole removal process again on that busted socket.

Final solder look:

I think I need to go back and flood a bit more solder on the pads. They're all making connection but they look a little "light". Also, the flux hasn't been fully removed yet.

Soooo... after all that, the keyboard works reliably. No need to press down on the chip while the computer is on.

As expected though, the shift, ctrl, break keys are another issue. Those still aren't working. It would be a bummer if it was the keyboard. Doing a quick eBay search didn't come up with any for sale right now. I think Best Electronics has them in CA but someone said they want like $40+ for one.

The said, the computer is usable for 90% of the software without those keys. It just keeps me from being able to use BASIC which is a bummer.

The investigation continues! :)

  • Additional updates.. not quite there yet. - Erik_, Tue Aug 23 2022 4:03pm
    Currently, everything seems to work except SHIFT, CTRL, and BREAK on the keyboard. I noticed the keys sometimes going in and out with working an not. I thought it was the ribbon cable but on a hunch, I pressed down on the POKEY chip while the computer was on and tried again. Lo and behold the keys started... more
    • New POKEY socket installed- Erik_, Thu Aug 25 2022 10:21am
      • Wow, looks good. I bet you can't get the same quality conne - Puckdropper, Sat Sep 03 2022 3:30am
        connector any more. I see what you mean about needing a bit more solder. Those jumper wires can be tricky, they seem to have a mind of their own. I wonder if the keyboard is suffering from the same corrosion that affected the socket? Maybe it was the way in? Hopefully you can take it apart... more
        • that a guy on the AtariAge forum suggested. It didn't change anything but at least the chip socket is soldered in there better. Yeah, I think it was a combination of the two sockets. The POKEY socket was making a bad connection from corrosion and then the keyboard socket is making a bad connection... more
          • 60 kOhm seems too high. - Puckdropper, Thu Sep 08 2022 6:03am
            Usually pullup resistors are 5-10k, but I'd think your keyboard should read either infinite ohms or 0 ohms with respect to ground.
            • on my meter. It's sort of an "on/off" type of thing. (Need to replace it). Final solder job with some reflowed and flux cleaned off. There's two pins on the left side that look like they could use a tiny bit more solder but I think it might be okay. Cartridge slot switch bypass jumper soldered... more
              • Is it just my angle or is there a bridge on the right-hand s - Puckdropper, Mon Sep 12 2022 11:36pm
                side above the jumper resistor? A trick with dirty switches is to move them back and forth a bunch of times, like 100 or more, until the contacts clean themselves off. If it's one of the more open types, you may be able to squirt some CRC 2-26 (from Home Depot) in there to help clean the contacts.... more
                • I think it might be a piece of paper towel - Erik_, Tue Sep 13 2022 1:53pm
                  from me wiping the rubbing alcohol off. Yeah, I've flipped it a bunch and cleaned it with CRC QD Electronic Cleaner. It's much better than it was. Probably just needs some more "back and forth". I think it is that keyboard connector. I just took a few minutes and removed the 4 screws that hold... more
                  • Is it just a ribbon cable? - Puckdropper, Thu Sep 15 2022 4:30am
                    I never got the tools to properly work with one, but they're pretty straight forward. You can probably put a new end on by smashing it into a new connector, but who knows how good of termination you'd get. If it's like an IDE cable, it's just headers and sockets.
                    • Sort of... - Erik_, Sat Sep 17 2022 12:44am
                      Here's a pic I found online It's more like through hole IC pins on a "ribbon" like cable. I could solder another connector that plugs into the board onto these pins but might be easier to replace the socket on the board first.
                      • I see. It does sound easier to work on the board first - Puckdropper, Thu Sep 22 2022 5:10am
                        Hopefully that's where the problem is. I think I saw something like that on a "make it a 286" chip upgrade. You pulled the 8088 out of the motherboard and plugged it into the board. You could then switch via a toggle switch between your 8088 and 80286. Of course the cable is missing on mine!
"Forces act when not restrained" - Puckdropper