Back to Skool: Routine at 7CE1

7CE1: Make a character walk up and down a few times or until a certain time

Used by command lists 0x12, 0x2A and 0x2C to make a character walk about a fixed location until a specified time, or until a certain number of walkabouts have been performed.

Input
H	Character number (0xB7-0xD1)

7CE1

LD L,$06

Collect the event ID (always 0, denoting the end of the lesson) and the maximum walkabout count from the command list and copy them into bytes 0x06 and 0x07 of the character's buffer

7CE3

CALL $6264

7CE6

LD L,$07

Decrease the walkabout counter at byte 0x07 of the character's buffer

7CE8

DEC (HL)

7CE9

JR NZ,$7CF9

If the character has not yet performed the maximum number of walkabouts, check whether the specified time has arrived

7CEB

INC (HL)

Set the walkabout counter back to 1 to ensure that we return to this execution path next time (to check whether the character has returned to the walkabout origin)

7CEC

LD L,$05

Byte 0x05 holds the x-coordinate of the walkabout origin

7CEE

CALL $7CB4

Reset the carry flag if the character is at the walkabout origin

7CF1

JP NC,$638C

Move to the next command in the command list if the specified time has arrived or the character has completed all his walkabouts

7CF4

CALL $639F

Otherwise send the character off to another walkabout destination via the routine at 63ED, and return to the instruction at 7CF7 (below) when done

7CF7

JR $7CE6

7CF9

CALL $7CAB

Reset the carry flag if the specified time has arrived and the character is at the walkabout origin

7CFC

JR $7CF1