With everything seemingly working, confidence is at an all time high in the hardware and software and the possibility of successfully completing this project. After about four decades of wanting to build the 1 megabit bubble card for the SBC-85 system, it feels pretty darn good to see this on my bench and to read and write bubbles.
No rest for the wicked, so it is now time to return to the board layout so they can be on order while polishing the software. There were a few things that I have found wrong or I don't like on the PCB that I want to change:
- Somehow I must not have submitted a silkscreen layer because none of the component names are there.
- The footprint for the pinned version of the 7110 so I can use either the lead less with its carrier or the 10-pin.
- Add more bulk capacitance as it will fit to improve the voltage decay on the +5 and 12V
- Space the filter capacitors on the sense line further apart so the oversized silver mica will fit
- Move the top left electrolytic so it is easier to get a chip removal tool on the top left 7254 driver
I am pretty, pretty pleased.