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Initial work on silly Genesis based menu
author Michael Pavone <pavone@retrodev.com>
date Sat, 25 Jul 2015 02:25:44 -0700
parents
children e8b14d5a5b5a
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789
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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1 dc.l $0, start
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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2 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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3 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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4 ;$10
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Michael Pavone <pavone@retrodev.com>
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5 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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6 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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7 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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8 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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9 ;$20
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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10 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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11 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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12 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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13 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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14 ;$30
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Michael Pavone <pavone@retrodev.com>
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15 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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16 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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17 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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18 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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19 ;$40
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Michael Pavone <pavone@retrodev.com>
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20 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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21 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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22 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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23 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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24 ;$50
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Michael Pavone <pavone@retrodev.com>
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25 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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26 dc.l empty_handler
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27 dc.l empty_handler
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28 dc.l empty_handler
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29 ;$60
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Michael Pavone <pavone@retrodev.com>
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30 dc.l empty_handler
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31 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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32 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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33 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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34 ;$70
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Michael Pavone <pavone@retrodev.com>
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35 dc.l int_4
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Michael Pavone <pavone@retrodev.com>
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36 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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37 dc.l int_6
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Michael Pavone <pavone@retrodev.com>
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38 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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39 ;$80
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Michael Pavone <pavone@retrodev.com>
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40 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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41 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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42 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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43 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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44 ;$90
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Michael Pavone <pavone@retrodev.com>
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45 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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46 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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47 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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48 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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49 ;$A0
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Michael Pavone <pavone@retrodev.com>
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50 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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51 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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52 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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53 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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54 ;$B0
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Michael Pavone <pavone@retrodev.com>
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55 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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56 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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57 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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58 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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59 ;$C0
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Michael Pavone <pavone@retrodev.com>
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60 dc.l empty_handler
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61 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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62 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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63 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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64 ;$D0
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Michael Pavone <pavone@retrodev.com>
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65 dc.l empty_handler
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66 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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67 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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68 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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69 ;$E0
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Michael Pavone <pavone@retrodev.com>
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70 dc.l empty_handler
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71 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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72 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
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73 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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74 ;$F0
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Michael Pavone <pavone@retrodev.com>
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75 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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76 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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77 dc.l empty_handler
41e83b38bdc8 Initial work on silly Genesis based menu
Michael Pavone <pavone@retrodev.com>
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78 dc.l empty_handler
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Michael Pavone <pavone@retrodev.com>
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79 dc.b "SEGA"
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Michael Pavone <pavone@retrodev.com>
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80 empty_handler:
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Michael Pavone <pavone@retrodev.com>
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81 int_6:
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Michael Pavone <pavone@retrodev.com>
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82 rte
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Michael Pavone <pavone@retrodev.com>
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83 int_4:
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Michael Pavone <pavone@retrodev.com>
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84 rte
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Michael Pavone <pavone@retrodev.com>
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85
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Michael Pavone <pavone@retrodev.com>
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86 rsset $FFFF8000
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Michael Pavone <pavone@retrodev.com>
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87 x_pos rs.w 1
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Michael Pavone <pavone@retrodev.com>
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88 base_cmd rs.l 1
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89
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Michael Pavone <pavone@retrodev.com>
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90 start:
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Michael Pavone <pavone@retrodev.com>
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91 lea $C00000, a0
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Michael Pavone <pavone@retrodev.com>
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92 lea $C00004, a1
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Michael Pavone <pavone@retrodev.com>
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93 move.w #$8104, (a1) ;Mode 5, everything turned off
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Michael Pavone <pavone@retrodev.com>
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94 move.w #$8004, (a1)
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Michael Pavone <pavone@retrodev.com>
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95 move.w #$8220, (a1) ;Scroll a table $8000
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Michael Pavone <pavone@retrodev.com>
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96 move.w #$8405, (a1) ;Scroll b table $A000
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Michael Pavone <pavone@retrodev.com>
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97 move.w #$8560, (a1) ;SAT table $C000
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Michael Pavone <pavone@retrodev.com>
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98 move.w #$8700, (a1) ;backdrop color 0
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Michael Pavone <pavone@retrodev.com>
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99 move.w #$8B00, (a1) ;full screen scroll
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Michael Pavone <pavone@retrodev.com>
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100 move.w #$8C87, (a1) ;40 cell mode, double-res interlace
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101 move.w #$8D00, (a1) ;hscroll table at 0
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Michael Pavone <pavone@retrodev.com>
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102 move.w #$8F02, (a1) ;autoinc 2
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Michael Pavone <pavone@retrodev.com>
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103 move.w #$9001, (a1) ;64x32 scroll size
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Michael Pavone <pavone@retrodev.com>
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104 move.l #$C0000000, (a1)
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Michael Pavone <pavone@retrodev.com>
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105 move.w #$000, (a0)
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Michael Pavone <pavone@retrodev.com>
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106 move.w #$EEE, (a0)
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107
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Michael Pavone <pavone@retrodev.com>
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108 ;init scroll table
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Michael Pavone <pavone@retrodev.com>
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109 move.l #$40000000, (a1)
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Michael Pavone <pavone@retrodev.com>
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110 move.w #0, (a0)
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Michael Pavone <pavone@retrodev.com>
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111 move.w #4, (a0)
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Michael Pavone <pavone@retrodev.com>
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112
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Michael Pavone <pavone@retrodev.com>
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113 ;load tiles
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Michael Pavone <pavone@retrodev.com>
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114 move.l #$48000000, (a1)
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115 lea font(pc), a2
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116 move.w #((fontend-font)/4 - 1), d0
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Michael Pavone <pavone@retrodev.com>
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117 tloop:
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Michael Pavone <pavone@retrodev.com>
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118 move.l (a2)+, (a0)
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Michael Pavone <pavone@retrodev.com>
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119 dbra d0, tloop
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120
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121
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122
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Michael Pavone <pavone@retrodev.com>
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123 ;clear name table
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Michael Pavone <pavone@retrodev.com>
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124 move.l #$40000002, (a1)
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Michael Pavone <pavone@retrodev.com>
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125 moveq #32, d0
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Michael Pavone <pavone@retrodev.com>
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126 move.w #(64*64-1), d1
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Michael Pavone <pavone@retrodev.com>
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127 ploop:
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128 move.w d0, (a0)
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129 dbra d1, ploop
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130
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131 move.l #$40000002, d3,
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Michael Pavone <pavone@retrodev.com>
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132 move.l d3, (a1)
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Michael Pavone <pavone@retrodev.com>
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133 move.l d3, base_cmd.w
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134
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135 lea Message(pc), a6
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Michael Pavone <pavone@retrodev.com>
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136 moveq #0, d0
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Michael Pavone <pavone@retrodev.com>
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137 bsr print_string
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138
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139
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140
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Michael Pavone <pavone@retrodev.com>
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141 move.w #$8144, (a1) ;enable display
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Michael Pavone <pavone@retrodev.com>
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142 move #$2300, sr
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Michael Pavone <pavone@retrodev.com>
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143
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Michael Pavone <pavone@retrodev.com>
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144
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Michael Pavone <pavone@retrodev.com>
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145 wait_forever
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Michael Pavone <pavone@retrodev.com>
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146 bra wait_forever
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Michael Pavone <pavone@retrodev.com>
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147
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Michael Pavone <pavone@retrodev.com>
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148 Message:
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149 dc.b "Journey From Darkness - Strider Returns (U) [c][!].bin", $A
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150 dc.b "Toejam & Earl in Panic on Funkotron (U) [!].bin", $A
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151 dc.b "Fire Shark (U) [c][!].bin", $A
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Michael Pavone <pavone@retrodev.com>
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152 dc.b "Sonic and Knuckles (W) [!].bin", 0
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153
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154 align 1
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155
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156 ;Prints a null terminated string
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157 ;a6 - pointer to string
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158 ;a0 - VDP data port
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159 ;d0 - base tile attribute
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160 ;
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161 ;Clobbers: d1.w, d2.w, d3.l
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162 print_string:
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163 lea widths(pc), a5
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164 move.w x_pos.w, d2
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165 move.l base_cmd.w, d3
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166 .loop
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167 moveq #0, d1
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168 move.b (a6)+, d1
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169 beq .end
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170 cmp.b #$A, d1
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171 beq .newline
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172 tst.b (-32, a5, d1.w)
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173 beq .narrow
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174 add.w d0, d1
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175 move.w d1, (a0)
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176 addq #2, d2
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177 bra .loop
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178 .narrow
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179 add.w d0, d1
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180 move.w d1, (a0)
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181 addq #1, d2
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182 move.l d2, d1
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183 ;add.w d1, d1
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184 and.w #$FFFE, d1
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185 swap d1
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186 eor.l #$20000000, d3
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187 or.l d3, d1
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188 move.l d1, (a1)
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189 bra .loop
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190 .newline
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191 moveq #0, d2
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192 and.l #$DFFFFFFF, d3
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193 add.l #$00800000, d3
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194 move.l d3, (a1)
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195 bra .loop
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196 .end
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197 move.w d2, x_pos.w
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198 move.l d3, base_cmd.w
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199 rts
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200
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201 align 1
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202 font:
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203 incbin font_interlace_variable.tiles
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204 fontend
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205
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206 widths:
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207 dc.b 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 1, 1, 0, 1
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208 dc.b 1, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 1, 0
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209 dc.b 0, 1, 0, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1
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210 dc.b 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
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211 dc.b 0, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1