I got tired of taking baby steps. Here is the VFD in operation on the replacement PCB:
Supplied with 5 VDC, the board draws about 205 mA in this configuration. The digit values are hard-coded, and I haven't coded the RAM-based implementation described in the previous post.
The odd brightness variation is a beat frequency between the VFD's refresh rate (5.85 ms or ~171 Hz) and my phone's camera. It's not visible to the naked eye.
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