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Fix some stuff with interrupt timing. The change in adjust_int_cycle gets Overdrive working again (vint was not being preferred over hint in some cases). One of the changes seems to have broken Fatal Rewind again, but no other regressions that I can see.
author Michael Pavone <pavone@retrodev.com>
date Sat, 30 Apr 2016 08:37:55 -0700
parents c86f27f5c5a6
children
line wrap: on
line source

	dc.l $0, start
	dc.l empty_handler
	dc.l empty_handler
	;$10
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	;$20
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	;$30
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	;$40
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	;$50
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	;$60
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	;$70
	dc.l int_4
	dc.l empty_handler
	dc.l int_6
	dc.l empty_handler
	;$80
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	;$90
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	;$A0
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	;$B0
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	;$C0
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	;$D0
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	;$E0
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	;$F0
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	dc.l empty_handler
	dc.b "SEGA"
empty_handler:
int_6:
	rte
int_4:
	move.w (a2), d0
	ori.w #$8000, d0
	move.w d0, (a4)+
	rte

start:
	lea $C00000, a0
	lea $C00004, a1
	move.w #$8104, (a1) ;Mode 5, everything turned off
	move.w #$8004, (a1)
	move.w #$8220, (a1) ;Scroll a table $8000
	move.w #$8404, (a1) ;Scroll b table $8000
	move.w #$8560, (a1) ;SAT table $C000
	move.w #$8700, (a1) ;backdrop color 0
	move.w #$8B00, (a1) ;full screen scroll
	move.w #$8C81, (a1) ;40 cell mode, no interlace
	move.w #$8C81, (mode).w
	move.w #$8D00, (a1) ;hscroll table at 0
	move.w #$8F02, (a1) ;autoinc 2
	move.w #$9011, (a1) ;64x64 scroll size
	move.l #$C0000000, (a1)
	move.w #$000, (a0)
	move.w #$EEE, (a0)

	;clear scroll table
	move.l #$40000000, (a1)
	move.l #0, (a0)

	;load tiles
	move.l #$44000000, (a1)
	lea font(pc), a2
	move.w #((fontend-font)/4 - 1), d0
tloop:
	move.l (a2)+, (a0)
	dbra d0, tloop



	;clear name table
	move.l #$40000002, (a1)
	moveq #32, d0
	move.w #(64*64-1), d1
ploop:
	move.w d0, (a0)
	dbra d1, ploop


	lea $FF0000, a4
	move.b #$40, (a4, 6)
	move.w #$8144, (a1) ;enable display
	move #$2300, sr

	lea (4, a1), a2 ;hv counter line address
	lea (2, a1), a3 ;second contro/status address

	move.b #254, d0
init_wait:
	cmp.b (a2), d0
	beq init_wait

top:
	move.b #254, d0
	lea $FF0000, a4
	move.w #$8F00, (a1)     ;autoinc of 0
	move.l #$40040000, (a1) ;unused VRAM address
wait_active:
	cmp.b (a2), d0
	bne.s wait_active

	move.l #$8A718014, (a1) ;enable Hints

	;sync to VDP by attempting to fill FIFO
	;being in vblank makes this a bit difficult

	rept 8
	move.l d0, (a0)
	endr

	;sample data for vblank flag off
	rept 82 ;two lines worth of move.l
	move.l (a3), (a4)+
	endr

	move.l a4, a5 ;save end of first buffer

	move.b (a2), d0
wait_new_line:
	cmp.b (a2), d0
	beq.s wait_new_line

	;sync to VDP by filling FIFO
	move.l d0, (a0)
	move.l d0, (a0)
	move.w d0, (a0)

	;sample data for line change HV value
	rept 45 ;one line worth of move.l
	move.l (a2), (a4)+
	endr

	move.l a4, usp ;save end of second buffer

	moveq #$70, d0
wait_hint_line:
	cmp.b (a2), d0
	bne.s wait_hint_line

	;sample data for line change HV value
	rept 45 ;one line worth of move.l
	move.l (a2), (a4)+
	endr

	move.l a4, a6

	move.b #223, d0
wait_inactive:
	cmp.b (a2), d0
	bne.s wait_inactive

	;sync to VDP by filling FIFO
	move.l d0, (a0)
	move.l d0, (a0)
	move.w d0, (a0)

	;sample data for vblank on
	rept 82 ;two lines worth of move.l
	move.l (a3), (a4)+
	endr

	move.l #$8AFF8004, (a1) ;disable Hints

	rsset $FFFF8000
vblank_start_min rs.w 1
vblank_start_max rs.w 1
vblank_end_min   rs.w 1
vblank_end_max   rs.w 1
hblank_start_min rs.w 1
hblank_start_max rs.w 1
hblank_end_min   rs.w 1
hblank_end_max   rs.w 1
line_change_min  rs.w 1
line_change_max  rs.w 1
hint_min         rs.w 1
hint_max         rs.w 1
mode             rs.w 1
printed_hv_dump  rs.b 1
button_state     rs.b 1

	lea $FF0001, a4
.loop:
	btst.b #3, (a4)
	beq.s found_vblank_off
	move.w 1(a4), d6
	addq #4, a4
	bra.s .loop
found_vblank_off:

	move.w (vblank_end_max).w, d0
	beq .new_max
	cmp.w d0, d6
	blo .no_new_max
.new_max
	move.w d6, (vblank_end_max).w
.no_new_max:


	move.w 1(a4), d6

	move.w (vblank_end_min).w, d0
	beq .new_min
	cmp.w d0, d6
	bhi .no_new_min
.new_min
	move.w d6, (vblank_end_min).w
.no_new_min:

	lea $FF0001, a4
;first find a point where HBLANK is not set
	bra.s .start
.loop:
	addq #4, a4
.start
	btst.b #2, (a4)
	bne.s .loop

;then find a point after that where it switches to on
.loop2:
	btst.b #2, (a4)
	bne.s found_hblank_on
	move.w 1(a4), d5
	addq #4, a4
	bra.s .loop2
found_hblank_on:

	move.w (hblank_start_max).w, d0
	beq .new_max
	cmp.w d0, d5
	blo .no_new_max
.new_max
	move.w d5, (hblank_start_max).w
.no_new_max:


	move.w 1(a4), d5

	move.w (hblank_start_min).w, d0
	beq .new_min
	cmp.w d0, d5
	bhi .no_new_min
.new_min
	move.w d5, (hblank_start_min).w
.no_new_min:

;finally find a point after that where it switches back off
.loop2:
	btst.b #2, (a4)
	beq.s found_hblank_off
	move.w 1(a4), d5
	addq #4, a4
	bra.s .loop2
found_hblank_off:

	move.w (hblank_end_max).w, d0
	beq .new_max
	cmp.w d0, d5
	blo .no_new_max
.new_max
	move.w d5, (hblank_end_max).w
.no_new_max:


	move.w 1(a4), d5

	move.w (hblank_end_min).w, d0
	beq .new_min
	cmp.w d0, d5
	bhi .no_new_min
.new_min
	move.w d5, (hblank_end_min).w
.no_new_min:

	move.l a5, a4 ;save line change buffer for later
	move.b (a5), d0
.loop
	move.w (a5), d7
	addq #2, a5
	cmp.b (a5), d0
	beq .loop
found_line_change:

	move.w (line_change_max).w, d0
	beq .new_max
	cmp.w d0, d7
	blo .no_new_max
.new_max
	move.w d7, (line_change_max).w
.no_new_max:

	move.w (a5), d7

	move.w (line_change_min).w, d0
	beq .new_min
	cmp.w d0, d7
	bhi .no_new_min
.new_min
	move.w d7, (line_change_min).w
.no_new_min:

	addq #1, a6
.loop:
	btst.b #3, (a6)
	bne.s found_vblank_on
	move.w 1(a6), d5
	addq #4, a6
	bra.s .loop
found_vblank_on:

	move.w (vblank_start_max).w, d0
	beq .new_max
	cmp.w d0, d5
	blo .no_new_max
.new_max
	move.w d5, (vblank_start_max).w
.no_new_max:

	move.w 1(a6), d5

	move.w (vblank_start_min).w, d0
	beq .new_min
	cmp.b d0, d5
	bhi .no_new_min
.new_min
	move.w d5, (vblank_start_min).w
.no_new_min:

	move usp, a5
.loop:
	btst.b #7, (a5)
	bne.s found_hint
	move.w (a5), d1
	addq #2, a5
	bra.s .loop
found_hint:

	move.w (hint_max).w, d0
	beq .new_max
	cmp.w d0, d1
	blo .no_new_max
.new_max
	move.w d1, (hint_max).w
.no_new_max:

	move.w (a5), d1
	and.w #$7FFF, d1

	move.w (hint_min).w, d0
	beq .new_min
	cmp.b d0, d1
	bhi .no_new_min
.new_min
	move.w d1, (hint_min).w
.no_new_min:

draw_info:
	;draw data
	move.w #$8F02, (a1)     ;autoinc of 2
	move.l #$40840002, (a1)

	moveq #0, d0
	lea VBlankStart(pc), a6
	bsr print_string


	move.w (vblank_start_max), d0
	moveq #0, d1
	bsr print_hexw

	move.w #32, (a0)
	move.w d5, d0
	bsr print_hexw

	move.w #32, (a0)
	move.w (vblank_start_min), d0
	bsr print_hexw

	moveq #0, d0
	move.l #$41040002, (a1)
	lea VBlankEnd(pc), a6
	bsr print_string

	;max value before vblank end
	moveq #0, d1
	move.w (vblank_end_max), d0
	bsr print_hexw

	move.w #32, (a0)
	move.w d6, d0
	bsr print_hexw

	;min value after vblank end
	move.w (vblank_end_min), d0
	move.w #32, (a0)
	bsr print_hexw

	moveq #0, d0
	move.l #$41840002, (a1)
	lea LineChange(pc), a6
	bsr print_string

	move.w (line_change_max), d0
	moveq #0, d1
	bsr print_hexw

	move.w #32, (a0)
	move.w d7, d0
	bsr print_hexw

	move.w (line_change_min), d0
	move.w #32, (a0)
	bsr print_hexw

	moveq #0, d0
	move.l #$42040002, (a1)
	lea HBlankStart(pc), a6
	bsr print_string

	move.w (hblank_start_max), d0
	moveq #0, d1
	bsr print_hexw

	move.w (hblank_start_min), d0
	move.w #32, (a0)
	bsr print_hexw

	moveq #0, d0
	move.l #$42840002, (a1)
	lea HBlankEnd(pc), a6
	bsr print_string

	move.w (hblank_end_max), d0
	moveq #0, d1
	bsr print_hexw

	move.w (hblank_end_min), d0
	move.w #32, (a0)
	bsr print_hexw

	moveq #0, d0
	move.l #$43040002, (a1)
	lea HInterrupt(pc), a6
	bsr print_string

	move.w (hint_max), d0
	moveq #0, d1
	bsr print_hexw

	move.w (hint_min), d0
	move.w #32, (a0)
	bsr print_hexw

	;read pad
	move.b #$40, $A10003
	move.b $A10003, d0
	move.b #$00, $A10003
	and.b #$3f, d0
	move.b $A10003, d1
	and.b #$30, d1
	lsl.b #2, d1
	or.b d1, d0
	not.b d0
	move.b (button_state).w, d2
	eor.b d0, d2
	and.b d0, d2
	move.b d2, d3 ;d3 contains newly pressed buttons, SACBRLDU
	move.b d0, (button_state).w

	btst.l #7, d3
	beq not_pressed

	moveq #0, d0
	move.l d0, (vblank_start_min).w
	move.l d0, (vblank_end_min).w
	move.l d0, (hblank_start_min).w
	move.l d0, (hblank_end_min).w
	move.l d0, (line_change_min).w
	move.l d0, (hint_min).w
	move.b d0, (printed_hv_dump).w
	move.w (mode).w, d0
	eor.w  #$81, d0
	move.w d0, (mode).w
	move.w d0, (a1)
	bra top

not_pressed

	move.b (printed_hv_dump).w, d0
	bne top
	move.b #1, (printed_hv_dump).w

	moveq #0, d1
	moveq #89, d4
	moveq #6, d5
	move.l #$45820002, d6
	move.l d6, (a1)

print_loop:
	dbra d5, .no_line_change
		 ;#$45820002
	add.l #$00800000, d6
	move.l d6, (a1)
	moveq #5, d5
.no_line_change
	move.w #32, (a0)
	move.w (a4)+, d0
	bsr print_hexw
	dbra d4, print_loop

	add.l #$01020000, d6
	move.l d6, (a1)
	moveq #0, d0
	lea Instructions(pc), a6
	bsr print_string

	bra top

VBlankStart:
	dc.b "VBlank Start: ", 0
VBlankEnd:
	dc.b "VBlank End:   ", 0
LineChange:
	dc.b "Line Change:  ", 0
HBlankStart:
	dc.b "HBlank Start: ", 0
HBlankEnd:
	dc.b "HBlank End:   ", 0
HInterrupt:
	dc.b "HInterrupt:   ", 0
Instructions:
	dc.b "Press Start to switch modes", 0

	align 1
;Prints a number in hex format
;d0.w - number to print
;d1.w - base tile attribute
;a0 - VDP data port
;
;Clobbers: d2.l, d3.l
;
print_hexw:
	moveq #3, d3
.digitloop
	rol.w #4, d0
	moveq #$F, d2
	and.b d0, d2
	cmp.b #$A, d2
	bge .hex
	add.w #$30, d2
	bra .makeattrib
.hex
	add.w #($41-$A), d2
.makeattrib
	add.w d1, d2
	move.w d2, (a0)
	dbra d3, .digitloop
	rts

;Prints a null terminated string
;a6 - pointer to string
;a0 - VDP data port
;d0 - base tile attribute
;
;Clobbers: d1.w
print_string:
.loop
	moveq #0, d1
	move.b (a6)+, d1
	beq .end
	add.w d0, d1
	move.w d1, (a0)
	bra .loop
.end
	rts

	align 1
font:
	incbin font.tiles
fontend