Alien 8: Routine at A631

Used by the routine at ENTRY.

Entered from ENTRY when the game is first run. Clears the variables and all 56 object records, from SEED up to BELOW_BLOCK, keeping only the ROM's frame counter, which becomes the seed (SEED): a machine switched on for a different time gets a different game. The frame counter has to be read first because it lies inside the object records (FRAMES, in record 7), which the clear wipes.

As Knight Lore's cold start, but for the call to R_CHECK_LEFTOVER, which does nothing that lasts.

Used by the routine at ENTRY. Entered from ENTRY when the game is first run. Clears the variables and all 56 object records, from SEED up to BELOW_BLOCK, keeping only the ROM's frame counter, which becomes the seed (SEED): a machine switched on for a different time gets a different game. The frame counter has to be read first because it lies inside the object records (FRAMES, in record 7), which the clear wipes. As Knight Lore's cold start, but for the call to R_CHECK_LEFTOVER, which does nothing that lasts.
START	A631	LD HL,SEED	from SEED up to BELOW_BLOCK: the variables and the 56 object records
	A634	LD BC,$0788
	A637	LD A,(FRAMES)	FRAMES, the ROM's frame counter, kept on the stack
	A63A	PUSH AF	FRAMES, the ROM's frame counter, kept on the stack
	A63B	CALL CLR_MEM	clear them, and the counter becomes the seed
	A63E	POP AF
	A63F	LD (SEED),A
	A642	CALL R_CHECK_LEFTOVER	a leftover that returns at once
	A645	JR MAIN_NEW_GAME	and set up a game