Learning Zeptoforth: OLED Display

I have Zeptoforth 1.0.1 installed on my Pico, and I'm learning how to use the bitmap drawing interface for ssd1306-based displays. This communicates over I²C. Here is my display, which is using the string printing interface to display a counter of the microsecond timer register, updating every 10ms:

OLED driven by Rpi Pico and Zeptoforth.

Here is the boilerplate from the example code:

And here is the counter display code:

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