Chapter 9 — Direct Seven-Segment Scanning

This chapter will move below MON-3 and scan the six-digit display directly.

Planned coverage:

PortDigits and PortSegs
digit select masks
segment glyph bytes
a six-byte display buffer
one scan step vs a full scan pass
why the loop must keep returning to display service
common mistakes: all digits off, wrong digit selected, ghosting, flicker

The goal is not to reject MON-3 helpers. The goal is to understand what those helpers are doing and to prepare for programs that must scan several devices cooperatively.

← Scanning and Persistence

Book 2

One-Bit Sound →