Bullet (Sega)

Bullet
Developer: Sega Publisher: Sega Platform: Arcade (Sega System 16B) Released in JP: June 1987 This game has uncompiled source code.

Uncompiled Code

To do: There's more code. See if one can somehow mash all of these together semi-cohesively.

Random bits of code are scattered throughout the game. These are found in epr-10994.b9, epr-10995.b10, and epr-10996.b11, but the addresses below apply to epr-10994.b9.

6FB8:

                     w	#24*2,a3
		adda.w	#24*2,a5
		dbra	d6,flgy2_loop
		rts
		

flag_check:

71C8:

ge x y_loop
		move.l	2(a0),a1			* a1=LINE1_0
		move.l	6

73D0:

>> scroll_data transfer
blk4_put:
		move.l	(a4)

77C8:

                     w	#1,d4
		move.w	d4,d2
bly_loop
		move.l	a5,a3
		move.w

7960:

                        (PAGEA_NDT).w,d0
		and.w	#$f,d0

79C3:

count_put:
		lea.l	TEST_ADDR+$180+4,a0
		move.w	(SCR_POSI).w,

7AE0:

                              d0
		and.w	#$f00,d0
		lsr.w	#8,d0
		bsr		cnum_put
		rts

*----------- scroll speed put -------------

speed_put:
		lea.l	TEST_ADDR+$280+4,a0
		clr.w	d0
		move.b	(PRN_FLAG).w,d0
		lsr.w	#4,d0
		bsr		cnum_put
		rts

*----------------------------------------------

scpage_pr:
		lea.l	TEST_A

7EA8:

                    .w	#$f,d0
		bsr		cnum_put
		
		rts

*------------- locate put ----------------
	
loc_put:
		lea.l	TEST_ADDR+$400+4,a0
		move.w	(SCR_YCEN).w,d0
		and.w	#$ff,d0
		move.w	d0,d1
		lsr.w	#4,d0
		bsr		cnum_put
		move.w	d1,d0
		and.w	#$f,d0
		bsr		cnum_put

		lea.l	TEST_ADDR+$480+4,a0
		move.w	(SCR_XCEN).w,d0
		and.w	#$ff,d0
		move.w	d0,d1
		lsr.w	#

77C8:

                     w	#1,d4
		move.w	d4,d2
bly_loop
		move.l	a5,a3
		move.w	

8230:

COUNT","S SPEED"
		align
				
		
*--------- screen init -------------

chksc_int:
		move.w	#0,(ROUND).w
		move.b	#$70,(PRN_FLAG).w
		rts
				
chksc_prn:
		TV_off
		move.b	#0,(SCR_STAT).w
		bsr		init_scr
		lea.l	F_VRAM,a0
		move.w	#32*28-1,d5
fix_clr2
		clr.l	(a0)+
		dbra	d5,fix_clr2
		bsr		t_msg
		bsr		scpage_pr
		TV_on
		rts
		


					
		ends

				
		end
	
	bra		p_wr3
		
*------------------- page wright ------------------------

p_wr0:
		bsr		pdata_set

8539:

p_wr2:
		bsr		pdata_set
		clr.w	d0
		
		lsl.w	#4,d1
		move.w	d1,d0
		
		or.w	d2,d0
		
		lsl.w	#8,d3
		lsl.w	#4,d3
		or.w	d3,d0
		
		lsl.w	#8,d4
		or.w	d4,d0
		
		rts
				
p_wr3:
		bsr		pdata_set
		cl