Amiga 1000 Reborn Again - Part 5

[@GadgetUK164]

Check out my new second channel for more repairs and upgrades - www.youtube.com/@GadgetUKExtra Correction : That CPU pin was NOT A8! Looking back at the footage, its the one in bottom left corner of the socket (as we see it) - that is _ECS (I think). _ECS is External Cycle Start. Which is not even connected on the GBA1000 - so, did the fix work on that pin, no idea until I find some hardware that uses _ECS... Part 1 - kzbin.info/www/bejne/hoHJdKF3r6hjpck Part 2 - kzbin.info/www/bejne/ZoSwpahnpamhm7c Part 3 - kzbin.info/www/bejne/oWK6c4VsirRnY7s Part 4 - kzbin.info/www/bejne/lZ-9aoWilNaor7c Part 6 - kzbin.info/www/bejne/ap_Ep2SJiNGbaLM

[@samt4202]

You may be able to detect the protection diode in the chip by placing the negative probe on the fixed pin and the positive probe on a ground pin and seeing if you have a diode reading or not. Not sure if this chip has protection diodes or not in it.

[@thetechnoshed]

Aha! Finally confirmation that my wiggling a screwdriver betwixt socket and chip is perfectly legitimate after all. I'm preserving pins! 😆 ECS is an output signal, BTW. If you'd like to know if your fix worked, tack a wire onto that socket pin on the back of the board and get your logic probe out. It should toggle low at every normal bus cycle.

[@frankowalker4662]

Great to see it up and running. Even if it is a bit iffy.

[@mikedefoy]

Good job, Chris! Amazing project. Regarding the chip pin, maybe using the portion of an old socket might hold it in place whilst soldering with hot air.

[@GadgetUK164]

Thanks! Nice idea =D

[@Neffers_UK]

I had a thought of putting the pin in the desoldering gun tip to heat the pin and solder, put it in, and turn the gun off to cool down, or something to that effect.

[@keithmcgerr3056]

Great vid, amazing work as always! LOL, sure, blame Jeff Goldblum! 😉

[@MrClump]

I've really been enjoying this series, watching it again while doing my ironing. 🤣 Where did you get your PGA extractor tool?

[@GadgetUK164]

Thanks, very much appreciated! Editing part 6 atm =D It's a Cyrix one that I've had since the 90s! They have been popping up on eBay though, and someone on Amibay makes and sells them I think!

[@erwin-1660]

Congrats on getting your GBA to work. With 8 completed GBAs (#9 is pending...), I consider myself to be somewhat of a GBA geek. Divider IC78 has been added to provide a clock signal with perfect 50% duty cycle. Apparently there are some 50MHz oscillators out there with a flaky output in terms of symmetry and signal shape. Should you choose to use the divider, replace the oscillator by 100MHz.

[@GadgetUK164]

@@erwin-1660 Thanks!!! Already done that in part 10 =)