Through the Trap Door: Routine at 63000

63000: Load loading screen and main game code


The following instructions set the DF SZ system variable to zero. This prevents a press of the break key returning us to BASIC while the game is loading.
63000	XOR A	Set DF SZ system variable to zero
63001	LD (23659),A	Set DF SZ system variable to zero
63004	LD DE,6912	Load loading screen to 40000 and copy into display file
63007	LD IX,40000
63011	LD A,255
63013	SCF
63014	CALL 1366
63017	LD HL,40000
63020	LD DE,16384
63023	LD BC,6912
63026	LDIR
63028	LD DE,32860	Load 32860 bytes to 27000
63031	LD IX,27000
63035	LD A,255
63037	SCF
63038	CALL 1366
63041	JP 34200	Jump to start-up code