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sf2_dma_tests.asm
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sf2_dma_tests.asm
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end_short_object_offset = $102;
; Vars
vsync_handled = $400
loop_count = $404
loop_count_string_pos = $ff8410
loop_count_string_start = $ff8413
config_values_start = $ff8430
palette_select = $ff8430
scroll_1_select = $ff8431
scroll_2_select = $ff8432
scroll_3_select = $ff8433
object_select = $ff8434
row_scroll_select = $ff8435
control_select = $ff8436
value_string_pos = $ff8460
value_string_start = $ff8463
base_vram_object_var = $ff8490
base_vram_scroll1_var = $ff8492
base_vram_scroll2_var = $ff8494
base_vram_scroll3_var = $ff8496
base_vram_rowscroll_var = $ff8498
base_vram_pal_control_var = $ff849A
base_reg_null_ptr = $ff84A0
base_reg_object_ptr = $ff84A4
base_reg_scroll1_ptr = $ff84A8
base_reg_scroll2_ptr = $ff84AC
base_reg_scroll3_ptr = $ff84B0
base_reg_rowscroll_ptr = $ff84B4
base_reg_palette_ptr = $ff84B8
base_reg_pal_control_ptr = $ff84BC
; Vars
; Vram constants
base_vram_object = $9100
base_vram_scroll1 = $90c0
base_vram_scroll2 = $9040
base_vram_scroll3 = $9080
base_vram_rowscroll = $9200
base_vram_palette = $9000
base_reg_object = $800100
base_reg_scroll1 = $800102
base_reg_scroll2 = $800104
base_reg_scroll3 = $800106
base_reg_rowscroll = $800108
base_reg_palette = $80010a
base_reg_pal_control = $80014a
; Vram constants
; Inputs
b_input_right = $00
b_input_left = $01
b_input_down = $02
b_input_up = $03
b_input_b1 = $04
b_input_b2 = $05
b_input_b3 = $06
input_right = $0001
input_left = $0002
input_down = $0004
input_up = $0008
input_b1 = $0010
input_b2 = $0020
input_b3 = $0040
; Inputs
scroll_2_pos_offset = $3a
scroll_3_pos_offset = $3e
video_control_offset = $4c
video_control_scroll_2_on = $0004
video_control_scroll_2_off = $FFFB
video_control_scroll_3_on = $0008
video_control_scroll_3_off = $FFF7
video_control_unknown_1_on = $0002
video_control_unknown_1_off = $FFFD
video_control_unknown_2_on = $0010
video_control_unknown_2_off = $FFEF
video_control_unknown_3_on = $0020
video_control_unknown_3_off = $FFDF
layer_control_offset = $52
layer_control_scroll_1_on = $0008
layer_control_scroll_1_off = $FFF7
layer_control_scroll_2_on = $0010
layer_control_scroll_2_off = $FFEF
layer_control_scroll_3_on = $0002
layer_control_scroll_3_off = $FFFD
layer_control_unknown_1_on = $0004
layer_control_unknown_1_off = $FFFB
layer_control_unknown_2_on = $0020
layer_control_unknown_2_off = $FFDF
;-----------------
; Layer control
;
; UU UU OO OO S1 S1 S2 S2 S3 S3 SF2 S2E S1E SF1 S3E RS
; 0 0 0 0 1 1 1 0 1 0 0 1 1 0 1 1
default_layer_control = $079B
;-----------------
rowscroll_on = $0001
rowscroll_off = $FFFE
menu_item_count = $06
org 0
incbin "build\sf2.bin"
org $8D1
; dc.b "123 "
org $000A30
jmp main
; Don't fade out test screen
org $000984
; NOP
; NOP
org $000752
jmp hijack_clear_ram
;-------------------
; Stop vsync handling after inputs are read and palette updated and do custom logic
org $000A9C
jmp hijack_vsync
;-------------------
;=================================
; Free space
;=================================
org $0E0000
;-------------------
hijack_vsync:
; From 000A9C
move.w $800148.l, ($5e,A5)
move.w ($4c,A5), $800122.l ; Video control
jsr $001BC4 ; Input and update video control, skip video control
; From 000A9C
move.l #$7fffffff, D7
sub.l D6, D7
move.l D7, (loop_count, A5) ; Store loop count
; Update pal
move.w base_vram_pal_control_var, D0
movea.l base_reg_pal_control_ptr, A0
move.w D0, (A0)
move.w #base_vram_palette, D0
movea.l base_reg_palette_ptr, A0
move.w D0, (A0)
move.w #$50, D0
.palette_vsync_loop
dbra D0, .palette_vsync_loop ; Original code does this
; Update pal
; Update rowscroll
move.w base_vram_rowscroll_var, D0
movea.l base_reg_rowscroll_ptr, A0
move.w D0, (A0)
movea.l #base_vram_rowscroll_var, A0
eori.w #$0010, (A0) ; Switch object buffers each frame
; Update rowscroll
; Update object base
move.w base_vram_object_var, D0
movea.l base_reg_object_ptr, A0
move.w D0, (A0)
movea.l #base_vram_object_var, A0
eori.w #$0080, (A0) ; Switch object buffers each frame
; Update object base
; Update scroll2 base
move.w base_vram_scroll2_var, D0
movea.l base_reg_scroll2_ptr, A0
move.w D0, (A0)
movea.l #base_vram_scroll2_var, A0
eori.w #$0040, (A0) ; Switch object buffers each frame
; Update scroll2 base
; Update scroll3 base
move.w base_vram_scroll3_var, D0
movea.l base_reg_scroll3_ptr, A0
move.w D0, (A0)
movea.l #base_vram_scroll3_var, A0
eori.w #$0040, (A0) ; Switch object buffers each frame
; Update scroll3 base
movem.l (A7)+, D0-D7/A0-A6 ; Restore regs
moveq #$0, D6 ; Vsync handled
rte
;-------------------
;-------------------
hijack_clear_ram
lea $ff0000.l, A0
move.w #$1fff, D4
moveq #$0, D0
.clear_ram_loop
move.l D0, (A0)+
move.l D0, (A0)+
dbra D4, .clear_ram_loop
jmp initialize_base_register_vars
;-------------------
;-------------------
main:
bsr fix_palette_brightness
bsr upload_object_data
bsr upload_rowscroll_data
bsr setup_variable_strings
bsr draw_ui
bsr upload_scroll23_data
.loop
bsr draw_count
bsr draw_values
bsr handle_controls
move.l #$7fffffff, D6 ; Reset loop count
.count_loop
dbra D6, .count_loop
bra .loop
;-------------------
;-------------------
initialize_base_register_vars:
; Values
move.w #base_vram_object, D0
move.w D0, base_vram_object_var
move.w #base_vram_scroll1, D0
move.w D0, base_vram_scroll1_var
move.w #base_vram_scroll2, D0
move.w D0, base_vram_scroll2_var
move.w #base_vram_scroll3, D0
move.w D0, base_vram_scroll3_var
move.w #base_vram_rowscroll, D0
move.w D0, base_vram_rowscroll_var
move.w #$003F, D0
move.w D0, base_vram_pal_control_var
; Values
; Pointers
move.l #base_reg_object, D0
move.l D0, base_reg_object_ptr
move.l #base_reg_scroll1, D0
move.l D0, base_reg_scroll1_ptr
move.l #base_reg_scroll2, D0
move.l D0, base_reg_scroll2_ptr
move.l #base_reg_scroll3, D0
move.l D0, base_reg_scroll3_ptr
move.l #base_reg_rowscroll, D0
move.l D0, base_reg_rowscroll_ptr
move.l #base_reg_palette, D0
move.l D0, base_reg_palette_ptr
move.l #base_reg_pal_control, D0
move.l D0, base_reg_pal_control_ptr
; Pointers
jmp (A4)
;-------------------
;-------------------
draw_ui:
movea.l #control_string, A2
bsr draw_string_hook
movea.l #config_string, A2
bsr draw_string_hook
movea.l #spacer_string_1, A2
bsr draw_string_hook
movea.l #spacer_string_2, A2
bsr draw_string_hook
movea.l #spacer_string_3, A2
bsr draw_string_hook
rts
;-------------------
;-------------------
setup_variable_strings:
moveq #$3, D0
movea.l #default_count_string, A1
movea.l #loop_count_string_pos, A0
bsr copy_mem
moveq #$15, D0
movea.l #default_value_string, A1
movea.l #value_string_pos, A0
bsr copy_mem
rts
;-------------------
;-------------------
handle_controls:
moveq #$00, D0
moveq #$00, D1
move.w ($7e,A5), D0
move.w ($80,A5), D1
eor.w D0, D1 ; Fresh input
and.w D0, D1 ; Was a press not a release
tst.w D1
beq .handle_controls_continue ; Nothing pressed!
bsr increment_value
bsr clamp_value_and_update_pointers
bsr update_value_string
.handle_controls_continue
rts
;-------------------
;-------------------
clamp_value_and_update_pointers:
btst #b_input_right, D1
beq .clamp_check_left
bsr handle_palette_value_change
.clamp_check_left
btst #b_input_left, D1
beq .clamp_check_down
bsr handle_scroll1_value_change
.clamp_check_down
btst #b_input_down, D1
beq .clamp_check_up
bsr handle_scroll2_value_change
.clamp_check_up
btst #b_input_up, D1
beq .clamp_check_b1
bsr handle_scroll3_value_change
.clamp_check_b1
btst #b_input_b1, D1
beq .clamp_check_b2
bsr handle_object_value_change
.clamp_check_b2
btst #b_input_b2, D1
beq .clamp_check_b3
bsr handle_row_scroll_value_change
.clamp_check_b3
btst #b_input_b3, D1
beq .clamp_exit
bsr handle_control_value_change
.clamp_exit
rts
;-------------------
;===========================================
handle_control_value_change:
movea.l #control_select, A0
move.b (A0), D0
cmpi.b #$07, D0
bne .control_continue
move.b #$00, (A0)
.control_continue
moveq #$00, D0
move.b (A0), D0
add.w D0, D0
add.w D0, D0
movea.l control_value_jump_tbl(PC,D0.w), A0
jsr (A0)
rts
;-------------------
control_value_jump_tbl:
dc.l control_value_0, control_value_1, control_value_2, control_value_3, control_value_4, control_value_5, control_value_6
;-------------------
control_value_0:
ori.w #layer_control_scroll_1_on, (layer_control_offset, A5)
andi.w #layer_control_unknown_1_off, (layer_control_offset, A5)
andi.w #layer_control_unknown_2_off, (layer_control_offset, A5)
ori.w #video_control_unknown_1_on, (video_control_offset, A5)
ori.w #video_control_unknown_2_on, (video_control_offset, A5)
ori.w #video_control_unknown_3_on, (video_control_offset, A5)
rts
control_value_1:
ori.w #layer_control_scroll_1_on, (layer_control_offset, A5)
ori.w #layer_control_unknown_1_on, (layer_control_offset, A5)
andi.w #layer_control_unknown_2_off, (layer_control_offset, A5)
ori.w #video_control_unknown_1_on, (video_control_offset, A5)
ori.w #video_control_unknown_2_on, (video_control_offset, A5)
ori.w #video_control_unknown_3_on, (video_control_offset, A5)
rts
control_value_2:
ori.w #layer_control_scroll_1_on, (layer_control_offset, A5)
andi.w #layer_control_unknown_1_off, (layer_control_offset, A5)
ori.w #layer_control_unknown_2_on, (layer_control_offset, A5)
ori.w #video_control_unknown_1_on, (video_control_offset, A5)
ori.w #video_control_unknown_2_on, (video_control_offset, A5)
ori.w #video_control_unknown_3_on, (video_control_offset, A5)
rts
control_value_3:
ori.w #layer_control_scroll_1_on, (layer_control_offset, A5)
andi.w #layer_control_unknown_1_off, (layer_control_offset, A5)
andi.w #layer_control_unknown_2_off, (layer_control_offset, A5)
andi.w #video_control_unknown_1_off, (video_control_offset, A5)
ori.w #video_control_unknown_2_on, (video_control_offset, A5)
ori.w #video_control_unknown_3_on, (video_control_offset, A5)
rts
control_value_4:
ori.w #layer_control_scroll_1_on, (layer_control_offset, A5)
andi.w #layer_control_unknown_1_off, (layer_control_offset, A5)
andi.w #layer_control_unknown_2_off, (layer_control_offset, A5)
ori.w #video_control_unknown_1_on, (video_control_offset, A5)
andi.w #video_control_unknown_2_off, (video_control_offset, A5)
ori.w #video_control_unknown_3_on, (video_control_offset, A5)
rts
control_value_5:
ori.w #layer_control_scroll_1_on, (layer_control_offset, A5)
andi.w #layer_control_unknown_1_off, (layer_control_offset, A5)
andi.w #layer_control_unknown_2_off, (layer_control_offset, A5)
ori.w #video_control_unknown_1_on, (video_control_offset, A5)
ori.w #video_control_unknown_2_on, (video_control_offset, A5)
andi.w #video_control_unknown_3_off, (video_control_offset, A5)
rts
control_value_6:
andi.w #layer_control_scroll_1_off, (layer_control_offset, A5)
andi.w #layer_control_unknown_1_off, (layer_control_offset, A5)
andi.w #layer_control_unknown_2_off, (layer_control_offset, A5)
ori.w #video_control_unknown_1_on, (video_control_offset, A5)
ori.w #video_control_unknown_2_on, (video_control_offset, A5)
ori.w #video_control_unknown_3_on, (video_control_offset, A5)
rts
;===========================================
;===========================================
handle_palette_value_change:
movea.l #palette_select, A0
move.b (A0), D0
cmpi.b #$0A, D0
bne .palette_continue
move.b #$00, (A0)
.palette_continue
moveq #$00, D0
move.b (A0), D0
add.w D0, D0
move.w palette_control_table(PC,D0.w), D0
move.w D0, base_vram_pal_control_var
move.b (A0), D0
cmpi.b #$09, D0
beq .disable_palette_update
move.l #base_reg_palette, D0
move.l D0, base_reg_palette_ptr
move.l #base_reg_pal_control, D0
move.l D0, base_reg_pal_control_ptr
rts
.disable_palette_update
move.l #base_reg_null_ptr, D0
move.l D0, base_reg_palette_ptr
move.l #base_reg_null_ptr, D0
move.l D0, base_reg_pal_control_ptr
rts
palette_control_table:
dc.w $003F, $0001, $0002, $0004, $0008, $0010, $0020, $0015, $002A, $0000
;===========================================
;-------------------
handle_scroll1_value_change:
movea.l #scroll_1_select, A0
move.b (A0), D0
cmpi.b #$04, D0
bne .scroll1_exit
move.b #$00, (A0)
.scroll1_exit
rts
;-------------------
;===========================================
handle_scroll2_value_change:
movea.l #scroll_2_select, A0
move.b (A0), D0
cmpi.b #$08, D0
bne .scroll2_exit
move.b #$00, (A0)
.scroll2_exit
moveq #$00, D0
move.b (A0), D0
add.w D0, D0
add.w D0, D0
movea.l scroll2_value_jump_tbl(PC,D0.w), A0
jsr (A0)
rts
;-------------------
scroll2_value_jump_tbl:
dc.l scroll2_value_0, scroll2_value_1, scroll2_value_2, scroll2_value_3, scroll2_value_4, scroll2_value_5, scroll2_value_6, scroll2_value_7
;-------------------
scroll2_value_0:
move.l #base_reg_scroll2, D0
move.l D0, base_reg_scroll2_ptr
ori.w #video_control_scroll_2_on, (video_control_offset, A5)
ori.w #layer_control_scroll_2_on, (layer_control_offset, A5)
rts
scroll2_value_1:
move.l #base_reg_null_ptr, D0
move.l D0, base_reg_scroll2_ptr
ori.w #video_control_scroll_2_on, (video_control_offset, A5)
ori.w #layer_control_scroll_2_on, (layer_control_offset, A5)
rts
scroll2_value_2:
move.l #base_reg_scroll2, D0
move.l D0, base_reg_scroll2_ptr
andi.w #video_control_scroll_2_off, (video_control_offset, A5)
ori.w #layer_control_scroll_2_on, (layer_control_offset, A5)
rts
scroll2_value_3:
move.l #base_reg_null_ptr, D0
move.l D0, base_reg_scroll2_ptr
andi.w #video_control_scroll_2_off, (video_control_offset, A5)
ori.w #layer_control_scroll_2_on, (layer_control_offset, A5)
rts
scroll2_value_4:
move.l #base_reg_scroll2, D0
move.l D0, base_reg_scroll2_ptr
ori.w #video_control_scroll_2_on, (video_control_offset, A5)
andi.w #layer_control_scroll_2_off, (layer_control_offset, A5)
rts
scroll2_value_5:
move.l #base_reg_null_ptr, D0
move.l D0, base_reg_scroll2_ptr
ori.w #video_control_scroll_2_on, (video_control_offset, A5)
andi.w #layer_control_scroll_2_off, (layer_control_offset, A5)
rts
scroll2_value_6:
move.l #base_reg_scroll2, D0
move.l D0, base_reg_scroll2_ptr
andi.w #video_control_scroll_2_off, (video_control_offset, A5)
andi.w #layer_control_scroll_2_off, (layer_control_offset, A5)
rts
scroll2_value_7:
move.l #base_reg_null_ptr, D0
move.l D0, base_reg_scroll2_ptr
andi.w #video_control_scroll_2_off, (video_control_offset, A5)
andi.w #layer_control_scroll_2_off, (layer_control_offset, A5)
rts
;===========================================
;===========================================
handle_scroll3_value_change:
movea.l #scroll_3_select, A0
move.b (A0), D0
cmpi.b #$08, D0
bne .scroll3_exit
move.b #$00, (A0)
.scroll3_exit
moveq #$00, D0
move.b (A0), D0
add.w D0, D0
add.w D0, D0
movea.l scroll3_value_jump_tbl(PC,D0.w), A0
jsr (A0)
rts
;-------------------
scroll3_value_jump_tbl:
dc.l scroll3_value_0, scroll3_value_1, scroll3_value_2, scroll3_value_3, scroll3_value_4, scroll3_value_5, scroll3_value_6, scroll3_value_7
;-------------------
scroll3_value_0:
move.l #base_reg_scroll3, D0
move.l D0, base_reg_scroll3_ptr
ori.w #video_control_scroll_3_on, (video_control_offset, A5)
ori.w #layer_control_scroll_3_on, (layer_control_offset, A5)
rts
scroll3_value_1:
move.l #base_reg_null_ptr, D0
move.l D0, base_reg_scroll3_ptr
ori.w #video_control_scroll_3_on, (video_control_offset, A5)
ori.w #layer_control_scroll_3_on, (layer_control_offset, A5)
rts
scroll3_value_2:
move.l #base_reg_scroll3, D0
move.l D0, base_reg_scroll3_ptr
andi.w #video_control_scroll_3_off, (video_control_offset, A5)
ori.w #layer_control_scroll_3_on, (layer_control_offset, A5)
rts
scroll3_value_3:
move.l #base_reg_null_ptr, D0
move.l D0, base_reg_scroll3_ptr
andi.w #video_control_scroll_3_off, (video_control_offset, A5)
ori.w #layer_control_scroll_3_on, (layer_control_offset, A5)
rts
scroll3_value_4:
move.l #base_reg_scroll3, D0
move.l D0, base_reg_scroll3_ptr
ori.w #video_control_scroll_3_on, (video_control_offset, A5)
andi.w #layer_control_scroll_3_off, (layer_control_offset, A5)
rts
scroll3_value_5:
move.l #base_reg_null_ptr, D0
move.l D0, base_reg_scroll3_ptr
ori.w #video_control_scroll_3_on, (video_control_offset, A5)
andi.w #layer_control_scroll_3_off, (layer_control_offset, A5)
rts
scroll3_value_6:
move.l #base_reg_scroll3, D0
move.l D0, base_reg_scroll3_ptr
andi.w #video_control_scroll_3_off, (video_control_offset, A5)
andi.w #layer_control_scroll_3_off, (layer_control_offset, A5)
rts
scroll3_value_7:
move.l #base_reg_null_ptr, D0
move.l D0, base_reg_scroll3_ptr
andi.w #video_control_scroll_3_off, (video_control_offset, A5)
andi.w #layer_control_scroll_3_off, (layer_control_offset, A5)
rts
;===========================================
;===========================================
handle_object_value_change:
movea.l #object_select, A0
move.b (A0), D0
cmpi.b #$03, D0
bne .object_exit
move.b #$00, (A0)
.object_exit
moveq #$00, D0
move.b (A0), D0
add.w D0, D0
add.w D0, D0
movea.l object_value_jump_tbl(PC,D0.w), A0
jsr (A0)
rts
;-------------------
object_value_jump_tbl:
dc.l object_value_0, object_value_1, object_value_2
;-------------------
object_value_0:
move.l #base_reg_object, D0
move.l D0, base_reg_object_ptr
movea.l #base_vram_object_var, A0
andi.w #$FFBF, (A0)
rts
object_value_1:
move.l #base_reg_object, D0
move.l D0, base_reg_object_ptr
movea.l #base_vram_object_var, A0
ori.w #$0040, (A0)
rts
object_value_2:
move.l #base_reg_null_ptr, D0
move.l D0, base_reg_object_ptr
rts
;===========================================
;===========================================
handle_row_scroll_value_change:
movea.l #row_scroll_select, A0
move.b (A0), D0
cmpi.b #$08, D0
bne .row_scroll_exit
move.b #$00, (A0)
.row_scroll_exit
moveq #$00, D0
move.b (A0), D0
add.w D0, D0
add.w D0, D0
movea.l rowscroll_value_jump_tbl(PC,D0.w), A0
jsr (A0)
rts
;-------------------
rowscroll_value_jump_tbl:
dc.l rowscroll_value_0, rowscroll_value_1, rowscroll_value_2, rowscroll_value_3, rowscroll_value_4, rowscroll_value_5, rowscroll_value_6, rowscroll_value_7
;-------------------
rowscroll_value_0:
move.l #base_reg_rowscroll, D0
move.l D0, base_reg_rowscroll_ptr
ori.w #rowscroll_on, (video_control_offset, A5)
ori.w #rowscroll_on, (layer_control_offset, A5)
rts
rowscroll_value_1:
move.l #base_reg_null_ptr, D0
move.l D0, base_reg_rowscroll_ptr
ori.w #rowscroll_on, (video_control_offset, A5)
ori.w #rowscroll_on, (layer_control_offset, A5)
rts
rowscroll_value_2:
move.l #base_reg_rowscroll, D0
move.l D0, base_reg_rowscroll_ptr
andi.w #rowscroll_off, (video_control_offset, A5)
ori.w #rowscroll_on, (layer_control_offset, A5)
rts
rowscroll_value_3:
move.l #base_reg_null_ptr, D0
move.l D0, base_reg_rowscroll_ptr
andi.w #rowscroll_off, (video_control_offset, A5)
ori.w #rowscroll_on, (layer_control_offset, A5)
rts
rowscroll_value_4:
move.l #base_reg_rowscroll, D0
move.l D0, base_reg_rowscroll_ptr
ori.w #rowscroll_on, (video_control_offset, A5)
andi.w #rowscroll_off, (layer_control_offset, A5)
rts
rowscroll_value_5:
move.l #base_reg_null_ptr, D0
move.l D0, base_reg_rowscroll_ptr
ori.w #rowscroll_on, (video_control_offset, A5)
andi.w #rowscroll_off, (layer_control_offset, A5)
rts
rowscroll_value_6:
move.l #base_reg_rowscroll, D0
move.l D0, base_reg_rowscroll_ptr
andi.w #rowscroll_off, (video_control_offset, A5)
andi.w #rowscroll_off, (layer_control_offset, A5)
rts
rowscroll_value_7:
move.l #base_reg_null_ptr, D0
move.l D0, base_reg_rowscroll_ptr
andi.w #rowscroll_off, (video_control_offset, A5)
andi.w #rowscroll_off, (layer_control_offset, A5)
rts
;===========================================
;-------------------
update_value_string:
movea.l #config_values_start, A0
movea.l #value_string_start, A1
movea.l #nibble_to_char, A2
moveq #menu_item_count, D0
.update_value_string_loop
moveq #$00, D1
moveq #$00, D2
move.b D0, D1
rol.b #$01, D1
add.b D0, D1 ; D1 contains the value string offset
move.b (A0, D0), D2 ; Get value
move.b (A2, D2), D2 ; Convert to char
move.b D2, (A1, D1)
dbra D0, .update_value_string_loop
rts
;-------------------
;-------------------
increment_value:
moveq #menu_item_count, D0
.increment_value_loop
btst D0, D1
bne .increment_value_exit
dbra D0, .increment_value_loop
rts
.increment_value_exit
movea.l #config_values_start, A0
addq.b #$01, (A0, D0)
rts
;-------------------
;-------------------
draw_values:
movea.l #value_string_pos, A2
bsr draw_string_hook
rts
;-------------------
;-------------------
draw_count:
movea.l #nibble_to_char, A2
movea.l #$ffff8404, A1 ; loop count
movea.l #loop_count_string_start, A0
moveq #$3, D0 ; Loop three times
moveq #$0, D2
.draw_count_loop
move.b (A1)+, D1
move.b D1, D2
; First nibble
andi.b #$F0, D1
ror.b #$4, D1
move.b (A2, D1), D1
move.b D1, (A0)+
; Second nibble
andi.b #$0F, D2
move.b (A2, D2), D2
move.b D2, (A0)+
dbra D0, .draw_count_loop ; Do it four times
movea.l #loop_count_string_pos, A2
bsr draw_string_hook
move.w base_vram_object_var, D0
rol.l #$08, D0
add.w #$80, D0
movea.l D0, A0 ; Object vram location in A0
movea.l #loop_count_string_start, A1
move.l #$00D00040, D5
moveq #$7, D2 ; Draw eight characters
bsr draw_object_text
rts
;-------------------
;-------------------
draw_object_text:
moveq #$0, D0
move.b (A1)+, D0
addi.w #-$7f80, D0
move.l D5, (A0)+
move.w D0, (A0)+
move.w #$d, (A0)+
addi.l #$c0000, D5 ; Change x position
dbra D2, draw_object_text
rts
;-------------------
;-------------------