Pentagram: Routine at CB77

CB77: Clear BC bytes from HL

Used by the routines at START, CLEAR_OBJECTS and CLEAR_BUFFER.

Input
HL	The first byte
BC	How many

CLEAR_MEMORY

CB77

LD E,$00

CLEAR_MEMORY_0

CB79

LD (HL),E

One at a time: BC is a 16-bit count

CB7A

INC HL

CB7B

DEC BC

CB7C

LD A,B

CB7D

OR C

CB7E

JR NZ,CLEAR_MEMORY_0

CB80

RET