Robotron: 2084: Routine at 59491

Used by the routine at Stage_Next_Wave.

Entry point called from Stage_Next_Wave. Reads the tracked enemy active count at 50220; if non-zero, jumps immediately to the spawn step at Evaluate_And_Spawn_Tracked_Enemies_Go. Otherwise checks 50221; if zero, also jumps to Evaluate_And_Spawn_Tracked_Enemies_Go. If 50221 is non-zero, halves it twice: if the result is still non-zero, jumps to Evaluate_And_Spawn_Tracked_Enemies_Go; otherwise increments A to 1 and falls through to store the spawn count and call Spawn_Tracked_Enemy_Entities.

Used by the routine at Stage_Next_Wave. Entry point called from Stage_Next_Wave. Reads the tracked enemy active count at 50220; if non-zero, jumps immediately to the spawn step at Evaluate_And_Spawn_Tracked_Enemies_Go. Otherwise checks 50221; if zero, also jumps to Evaluate_And_Spawn_Tracked_Enemies_Go. If 50221 is non-zero, halves it twice: if the result is still non-zero, jumps to Evaluate_And_Spawn_Tracked_Enemies_Go; otherwise increments A to 1 and falls through to store the spawn count and call Spawn_Tracked_Enemy_Entities.
Evaluate_And_Spawn_Tracked_Enemies	59491	LD A,(50220)	If the tracked enemy active count at 50220 is non-zero, skip to Evaluate_And_Spawn_Tracked_Enemies_Go.
	59494	AND A
	59495	JP NZ,Evaluate_And_Spawn_Tracked_Enemies_Go
	59498	LD A,(50221)
	59501	AND A	If the set count at 50221 is also zero, skip to Evaluate_And_Spawn_Tracked_Enemies_Go.
	59502	JP Z,Evaluate_And_Spawn_Tracked_Enemies_Go
	59505	SRL A	Halve 50221 twice; if the result is still non-zero, skip to Evaluate_And_Spawn_Tracked_Enemies_Go.
	59507	SRL A
	59509	JP NZ,Evaluate_And_Spawn_Tracked_Enemies_Go
	59512	INC A	Set spawn count to 1.
Evaluate_And_Spawn_Tracked_Enemies_Go	59513	LD (50220),A	Store the spawn count at 50220.
	59516	CALL Spawn_Tracked_Enemy_Entities	Call Spawn_Tracked_Enemy_Entities to spawn the tracked enemy wave and advance.
	59519	INC HL
	59520	RET