Skool Daze: Routine at F905

F905: Collect the identifier for the next lesson

Used by the routine at 66E6. Returns with A holding the identifier (0xE0-0xFF) for the next lesson. If the next lesson is PLAYTIME, one of the 'special' PLAYTIMEs (0xF3, 0xF4 or 0xF5) may be chosen in place of the main timetable entry.

Input
E	Lesson number (0x00-0x3F)

F905

LD D,$FE

Pick up the lesson identifier (0xE0-0xFF) from the main timetable

F907

LD A,(DE)

F908

CP $F3

Is it PLAYTIME (0xF3-0xFF)?

F90A

RET C

Return if not

F90B

LD A,($7FEA)

7FEA holds the game mode indicator

F90E

AND A

Set the zero flag if we're in demo mode

F90F

LD A,(DE)

Restore the lesson identifier to A and return if we're in demo mode

F910

RET Z

F911

CALL $61A1

A=random number

F914

JP $6E33

Select a 'special' PLAYTIME occasionally