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|
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 empty_handler
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 IS COOL "
dc.b "(C)M.Pavone 2021"
dc.b "TRAIN MEMES STAN"
dc.b "D SILENTLY "
dc.b " "
dc.b "TRIUMPHANT MAMMA"
dc.b "LS SALUTE SOCIAL"
dc.b "ITES "
dc.b "MP 20210227-01",0,0
dc.b "J "
dc.l $0
dc.l romend-1
dc.l $FF0000
dc.l $FFFFFF
dc.b " "
dc.b " "
dc.b " "
dc.b " "
dc.b "JUE "
frame_counter equ $FFFF8000
ram_code equ $FFFF8002
empty_handler:
rte
start:
lea $A14000, a3
move.l #'SEGA', (a3)
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 #$8A01, (a1) ;Set HINT counter
move.w #$8B00, (a1) ;full screen scroll
move.w #$8C81, (a1) ;40 cell mode, no interlace
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, 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
move.b #$40, $A10009
move.b #$00, $A10003
move.l #$45960002, d7
move.l d7, (a1)
move.l #$800000, d6
lea ram_code_src(pc), a6
lea ram_code.w, a5
moveq #(font-ram_code_src)/2-1, d0
copy:
move.w (a6)+, (a5)+
dbra d0, copy
lea $101(a3), a4
lea $100.w, a5
move.l #'SEGA', d5
move.l #' SEG', d4
moveq #0, d0
moveq #1, d2
move.w #180, d3
btst #6, $A10001
beq .not_pal
move.w #150, d3
.not_pal:
jmp ram_code.w
ram_code_src:
move.b d2, (a4)
cmp.l (a5), d5
beq.s is_good
cmp.l (a5), d4
bne.s is_bad
is_good:
move.b d0, (a4)
lea good(pc), a6
bsr.s print_string
add.l d6, d7
move.l d7, (a1)
bsr.s print_string
add.l d6, d7
move.l d7, (a1)
bsr.s print_string
move.w #$8164, (a1)
move #$2500, SR
wait:
cmp.w frame_counter.w, d3
bne.s wait
move #$2700, SR
move.b d2, (a4)
move.l $0.w, a7
move.l $4.w, a6
move.w #$8104, (a1)
move.l d0, (a3)
jmp (a6)
is_bad:
lea bad(pc), a6
bsr.s print_string
add.l d6, d7
move.l d7, (a1)
bsr.s print_string
add.l d6, d7
move.l d7, (a1)
bsr.s print_string
move.w #$8144, (a1)
forever:
bra.s forever
int_6:
addq.w #1, frame_counter.w
rte
;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
good:
dc.b " BLASTEM THINKS", 0
dc.b " THAT THIS CART", 0
dc.b " TASTES DELICIOUS!", 0
bad:
dc.b " *sniff* *sniff*", 0
dc.b " something doesn't", 0
dc.b " smell right...", 0
align 1
font:
incbin font.tiles
fontend
romend
|
