Today I could arrange a longer session than usual, so I could work on those parts
- 2021-11-06--01-the-plan.jpg (181.54 KiB) Viewed 6542 times
The CMS parts, it was doable for me. The oscillator was the most uneasy, as the pads are almost completely under the component. It seems ok, but time will tell. The MAX IC and the Falcon DAC were easier, for most of the time I used the solder pump after applying a lump of solder, until I found a way to remove most of the lump from the tip to apply solder pin by pin.
I had to rework the DAC though as I had two solder bridges, the first easily removed using the "lump & pump" technique ; I struggled with the second one (pin 3 & 4) until I checked on the schematics that they both were grounded, then I covered my mess with a nice bridge
. I also had a bend pin (pin 2) after soldering, I succeeded to straighten it.
All in all, I have to harvest the ROM port, all the IC from the donor machine, and using the donor PSU, it seems that I could try a "first light" by the end of the year.
- 2021-11-06--02-the-progress.jpg (261.07 KiB) Viewed 6542 times
Note : I didn't work on the PLCC Socket of the CPU, as I have a DIP64 version that I plan to use with the
16MHz ST BOOSTER at some point. For the time being, I will plug it directly on one of the 5V bus port.
Epilogue : after cleaning, it turns out that I forgotten to solder the 32.768 kHz crystal required for the RTC... see you next time, crystal...
to put a header like I will install on other power connectors... but later, when I will have ordered and received said connectors.
