Skool Daze: Routine at 79BA

79BA: Control EINSTEIN during class (1)

Used by command lists 0x90, 0x98, 0xA0 and 0xA8. Makes EINSTEIN wait for his turn to speak, and then hands over control to the interruptible subcommand routine at 798C; when EINSTEIN has finished speaking, control returns to the primary command routine at 79CA.

Input
H	0xA9 (EINSTEIN)

79BA

LD A,($7FC9)

Pick up the lesson signal flags from 7FC9

79BD

RLCA

Is it EINSTEIN's turn to speak yet?

79BE

RET NC

Return if not

79BF

LD L,$63

Replace the address of this primary command routine in bytes 0x63 and 0x64 of EINSTEIN's buffer with that of 79CA (so that we go there after EINSTEIN has finished speaking)

79C1

LD (HL),$CA

79C3

LD L,$6A

Set the routine address MSB in byte 0x6A of EINSTEIN's buffer to that of 798C; the LSB will be set later

79C5

LD (HL),$79

79C7

JP $7986

Make EINSTEIN join the queue to speak