diff --git a/_source/_posts/2025-04-20-ti99-4a-restoration-ep2.md b/_source/_posts/2025-04-20-ti99-4a-restoration-ep2.md index 42eb622..1ab6cfe 100644 --- a/_source/_posts/2025-04-20-ti99-4a-restoration-ep2.md +++ b/_source/_posts/2025-04-20-ti99-4a-restoration-ep2.md @@ -39,12 +39,22 @@ I therefore decided to go for a replacement (also socketing the chip while I was ### Removing the old TMS9900 -I did a poor job desoldering and removing the old TMS9900. My main concern was to avoid damaging the PCB, but I had a hard time adjusting the right level of force to the pins. I'm not proud of the result, quite a few pins were broken in the process. :shame: +Let's face it, I did a poor job desoldering and removing the old TMS9900. Was it the Chinese desoldering pump, my lack of skill, a 40+ years old PCB, or a bit of all of these? + +My main concern was to avoid damaging the PCB, but I had a hard time adjusting the right level of force to the pins. I'm not proud of the result, quite a few pins were broken in the process. :face_vomiting: + +{% figure caption:"At this stage I really hoped that CPU was indeed dead" %} +![Badly damaged TMS9900](assets/TI-resto/20250413-botched-desolder.jpg) +{% endfigure %} ### Preparing for new TMS9900 I cleaned up the board and soldered new female header pins to receive the new CPU. +{% figure caption:"Shiny new female headers to receive the new CPU" %} +![New socket for TMS9900](assets/TI-resto/20250420-socket.jpg) +{% endfigure %} + Pre-power-up checks done: * visual inspection of solders * absence of shorts between adjacent pins diff --git a/_source/assets/TI-resto/20250413-botched-desolder.jpg b/_source/assets/TI-resto/20250413-botched-desolder.jpg new file mode 100644 index 0000000..9fcfcfc Binary files /dev/null and b/_source/assets/TI-resto/20250413-botched-desolder.jpg differ diff --git a/_source/assets/TI-resto/20250420-socket.jpg b/_source/assets/TI-resto/20250420-socket.jpg new file mode 100644 index 0000000..477084a Binary files /dev/null and b/_source/assets/TI-resto/20250420-socket.jpg differ