Chapter 2 — Running Under MON-3

This chapter will teach MON-3 as the first programming surface.

Planned coverage:

why user programs commonly live at $4000
RST 10H as the MON-3 API gateway
the convention: API call number in C, parameters in registers, results in registers or flags
useful first calls: beep, scan keys, write a character/string to LCD, convert values for seven-segment output, delay
the difference between a monitor service and direct port programming
when to use MON-3 first and when to drop below it
Debug80’s MON-3 profile as the same environment in the emulator

This chapter should give readers visible wins before they know every hardware port.