Contact Sam Cruise: Routine at 6400

6400: Copy source sprite tiles over target sprite tiles

Used by the routine at 6412 to prepare sprite tiles 0xEF-0xF7, which are used by animatory states 0x09, 0x0A, 0x0F and 0x1F (corresponding to the sprites of Sam rolling and somersaulting).

Input
C	Number of tiles to copy
E	Target sprite tile reference
L	Source sprite tile reference

6400

LD H,$C7

This is the base page of the graphic data for the source tile

This entry point is used by the routine at 6412 with H=0xD7.

6402

LD D,$C7

This is the base page of the graphic data for the target tile

6404

LD B,$10

Copy the source sprite tile over the target sprite tile (8 bytes of graphic data interleaved with 8 bytes of mask data)

6406

LD A,(HL)

6407

LD (DE),A

6408

INC H

6409

INC D

640A

DJNZ $6406

640C

INC L

Move to the next source sprite tile reference

640D

INC E

Move to the next target sprite tile reference

640E

DEC C

Have all the sprite tiles been copied yet?

640F

JR NZ,$6400

Jump back if not

6411

RET