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Rev | Author | Line No. | Line |
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9 | daniel-mar | 1 | |
2 | ; Aysalia DOS Launcher |
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3 | ; Launches aydos1.gam and aydos2.gam |
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22 | daniel-mar | 4 | ; Revision 2018-12-07 |
9 | daniel-mar | 5 | ; (C) 2018 Daniel Marschall, ViaThinkSoft |
6 | |||
7 | .model small |
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8 | .stack 10h |
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11 | daniel-mar | 9 | |
10 | ; ------------------------------------------------------- |
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11 | |||
9 | daniel-mar | 12 | .data |
13 | |||
22 | daniel-mar | 14 | exename1 db "AYDOS1.GAM", 0 |
15 | exename2 db "AYDOS2.GAM", 0 |
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16 | cmdargs db 0, '', 0Dh |
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9 | daniel-mar | 17 | |
18 | dummy_fcb db 36 dup(0) |
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19 | |||
20 | paramblk dw 0 ; use environment of parent |
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21 | dw cmdargs ; command line arguments |
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22 | dw 0 ; cmdargs_seg |
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23 | dw dummy_fcb ; fcb1 |
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24 | dw 0 ; fcb1_seg |
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25 | dw dummy_fcb ; fcb2 |
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26 | dw 0 ; fcb2_seg |
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27 | |||
22 | daniel-mar | 28 | menu1 db 13, 10, \ |
29 | 13, 10, \ |
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30 | 13, 10, \ |
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31 | 13, 10, \ |
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32 | ' Aysalia DOS', 13, 10, \ |
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33 | 13, 10, \ |
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34 | 13, 10, \ |
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35 | ' Welches Spiel soll gestartet werden?', 13, 10, \ |
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36 | 13, 10, \ |
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37 | ' Dr', 81h, 'cke eine der folgenden Tasten:', 13, 10, \ |
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38 | 13, 10, \ |
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39 | ' 1 Aysalia DOS I', 13, 10, \ |
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40 | ' 2 Aysalia DOS II', 13, 10, \ |
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41 | 13, 10, \ |
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42 | ' 9 Beenden', 13, 10, \ |
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43 | 13, 10, \ |
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44 | 13, 10, \ |
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45 | 13, 10, 0 |
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17 | daniel-mar | 46 | |
22 | daniel-mar | 47 | error1 db 13, 10, \ |
48 | 'Fehler: Spiel kann nicht gestartet werden. Fehlt eine Datei?', 13, 10, \ |
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49 | 13, 10, 0 |
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9 | daniel-mar | 50 | |
22 | daniel-mar | 51 | gameover1 db 13, 10, \ |
52 | 'Spiel zu Ende!', 13, 10, \ |
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53 | 13, 10, 0 |
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9 | daniel-mar | 54 | |
11 | daniel-mar | 55 | ; ------------------------------------------------------- |
56 | |||
9 | daniel-mar | 57 | .code |
58 | |||
59 | clear_vga PROC |
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22 | daniel-mar | 60 | mov ax, 0A000h |
9 | daniel-mar | 61 | mov es, ax |
62 | xor di, di |
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63 | mov ax, 0 |
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64 | mov cx, 64000 |
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65 | rep stosb |
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66 | ret |
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67 | clear_vga ENDP |
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68 | |||
11 | daniel-mar | 69 | set_screen12 PROC |
70 | mov ah, 0 ; set screen mode |
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71 | mov al, 12h ; graphic mode, 640x480 pixel, 16 colors (VGA) |
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72 | int 10h |
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73 | ret |
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74 | set_screen12 ENDP |
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75 | |||
9 | daniel-mar | 76 | setup_paramblk PROC |
77 | mov ax, cs |
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78 | mov [paramblk + 4], ax ; cmdargs_seg |
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79 | mov [paramblk + 8], ax ; fcb1_seg |
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80 | mov [paramblk + 12], ax ; fcb2_seg |
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81 | ret |
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82 | setup_paramblk ENDP |
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83 | |||
11 | daniel-mar | 84 | set_numlock_on PROC |
85 | push ds |
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86 | mov ax, 40h |
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22 | daniel-mar | 87 | mov ds, ax ; Go to BIOS Data Area ( http://stanislavs.org/helppc/bios_data_area.html ) |
11 | daniel-mar | 88 | mov bx, 17h ; Load Keyboard flag byte 0 |
22 | daniel-mar | 89 | mov al, [bx] ; Read |
90 | or al, 20h ; Set bit 5 (numlock) to 1 |
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91 | mov [bx], al ; Write |
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11 | daniel-mar | 92 | pop ds |
93 | ret |
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94 | set_numlock_on ENDP |
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9 | daniel-mar | 95 | |
11 | daniel-mar | 96 | flush_keyb_buf PROC |
97 | mov ah, 0Ch ; Flush input buffer and input |
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98 | mov al, 0 |
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9 | daniel-mar | 99 | int 21h |
11 | daniel-mar | 100 | ret |
101 | flush_keyb_buf ENDP |
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9 | daniel-mar | 102 | |
11 | daniel-mar | 103 | exit_to_dos PROC |
22 | daniel-mar | 104 | mov ah, 4Ch |
11 | daniel-mar | 105 | mov al, 00h |
106 | int 21h |
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107 | ret |
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108 | exit_to_dos ENDP |
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9 | daniel-mar | 109 | |
11 | daniel-mar | 110 | sleep_5 PROC |
21 | daniel-mar | 111 | mov ah, 00h |
17 | daniel-mar | 112 | int 1Ah |
21 | daniel-mar | 113 | cmp dx, 7FFFh |
22 | daniel-mar | 114 | jg sleep_5_upperhalf |
115 | sleep_5_lowerhalf: |
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21 | daniel-mar | 116 | mov bx, dx |
22 | daniel-mar | 117 | add bx, 91 ; 18.2 = 1 sec (therefore 91 = 5 sec) |
118 | sleep_5_lowerhalf_again: |
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21 | daniel-mar | 119 | int 1Ah |
17 | daniel-mar | 120 | cmp dx, bx |
22 | daniel-mar | 121 | jl sleep_5_lowerhalf_again |
11 | daniel-mar | 122 | ret |
22 | daniel-mar | 123 | sleep_5_upperhalf: |
21 | daniel-mar | 124 | mov bx, dx |
125 | sub bx, 7FFFh |
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22 | daniel-mar | 126 | add bx, 91 ; 18.2 = 1 sec (therefore 91 = 5 sec) |
127 | sleep_5_upperhalf_again: |
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21 | daniel-mar | 128 | int 1Ah |
129 | sub dx, 7FFFh |
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130 | cmp dx, bx |
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22 | daniel-mar | 131 | jl sleep_5_upperhalf_again |
21 | daniel-mar | 132 | ret |
11 | daniel-mar | 133 | sleep_5 ENDP |
9 | daniel-mar | 134 | |
22 | daniel-mar | 135 | print_color_string PROC |
136 | ; This function requires: |
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137 | ; dx = Pointer to zero terminated string |
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138 | ; cl = Color |
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139 | mov ah, 0Eh |
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140 | print_color_string_again: |
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141 | mov al, 0 |
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142 | mov bx, dx |
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143 | cmp [bx], al |
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144 | je print_color_string_end |
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145 | mov al, [bx] |
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146 | mov bl, cl |
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147 | int 10h |
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148 | add dx, 1 |
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149 | jmp print_color_string_again |
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150 | print_color_string_end: |
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151 | ret |
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152 | print_color_string ENDP |
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153 | |||
154 | set_bg_color PROC |
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155 | ; This function requires: |
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156 | ; bl = Color |
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21 | daniel-mar | 157 | mov ah, 0Bh |
158 | mov bh, 00h |
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159 | int 10h |
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22 | daniel-mar | 160 | ret |
161 | set_bg_color ENDP |
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21 | daniel-mar | 162 | |
22 | daniel-mar | 163 | print_menu_screen PROC |
23 | daniel-mar | 164 | ; Clear screen |
165 | call clear_vga |
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22 | daniel-mar | 166 | |
167 | ; Set background color |
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168 | mov bl, 8 ; dark green background |
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169 | call set_bg_color |
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170 | |||
171 | ; Set text color |
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172 | mov cl, 0Fh ; white font |
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9 | daniel-mar | 173 | lea dx, menu1 |
22 | daniel-mar | 174 | call print_color_string |
175 | |||
11 | daniel-mar | 176 | ret |
177 | print_menu_screen ENDP |
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178 | |||
17 | daniel-mar | 179 | print_error_screen PROC |
23 | daniel-mar | 180 | ; Clear screen |
181 | call clear_vga |
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21 | daniel-mar | 182 | |
22 | daniel-mar | 183 | ; Set background color |
184 | mov bl, 4 ; dark red background |
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185 | call set_bg_color |
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186 | |||
187 | ; Set text color |
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188 | mov cl, 0Fh ; white font |
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17 | daniel-mar | 189 | lea dx, error1 |
22 | daniel-mar | 190 | call print_color_string |
191 | |||
17 | daniel-mar | 192 | ret |
193 | print_error_screen ENDP |
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194 | |||
23 | daniel-mar | 195 | print_gameover_message PROC |
22 | daniel-mar | 196 | ; Keep cursor position |
21 | daniel-mar | 197 | |
22 | daniel-mar | 198 | ; Set background color |
199 | mov bl, 4 ; dark red background |
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200 | call set_bg_color |
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201 | |||
202 | ; Set text color |
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203 | mov cl, 0Fh ; white font |
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11 | daniel-mar | 204 | lea dx, gameover1 |
22 | daniel-mar | 205 | call print_color_string |
206 | |||
11 | daniel-mar | 207 | ret |
23 | daniel-mar | 208 | print_gameover_message ENDP |
11 | daniel-mar | 209 | |
210 | ; ------------------------------------------------------- |
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211 | |||
212 | start: |
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213 | ; Setup data segment |
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214 | mov ax, @data ; moving base address of data to ax |
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215 | mov ds, ax ; moving contents of ax into ds |
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216 | ; data section now gets initialized |
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217 | |||
218 | ; Preserve the original screen mode |
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219 | mov ah, 0Fh ; Query screen mode |
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220 | int 10h |
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221 | push ax ; actually, we are only interested in register al (screen mode), not in ah (column count) |
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9 | daniel-mar | 222 | |
11 | daniel-mar | 223 | ; Change numlock to ON |
224 | ; DOSBox has a bug where the NumLock is not correctly set to the setting of the host system, |
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225 | ; so you have to press the NumLock key twice so that DOSBox recognizes the status. |
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226 | ; see: https://sourceforge.net/p/dosbox/bugs/71/ |
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227 | ; https://superuser.com/questions/255102/is-there-a-way-to-use-the-numeric-keypad-in-dosbox/1146986 |
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228 | ; Since the game uses number keys very often, we set NumLock to ON |
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229 | call set_numlock_on |
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230 | |||
231 | ; Reduce size of own application to give the called applications more space |
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232 | ; see https://stackoverflow.com/a/10067627 |
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233 | mov ah, 4Ah |
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14 | daniel-mar | 234 | mov bx, 100 ; 100 paragraphs a 16 bytes = 1600 bytes |
11 | daniel-mar | 235 | int 21h |
236 | |||
237 | menu: |
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238 | ; Video Mode VGA 12 |
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239 | call set_screen12 |
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240 | |||
241 | ; Flush keyboard buffer |
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242 | call flush_keyb_buf |
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243 | |||
244 | ; Print menu screen |
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245 | call print_menu_screen |
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246 | |||
9 | daniel-mar | 247 | retry: |
248 | ; Query keyboard input |
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11 | daniel-mar | 249 | mov ah, 07h ; Direct character input, without echo |
9 | daniel-mar | 250 | int 21h |
251 | cmp al, '1' |
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252 | je prog1 |
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253 | cmp al, '2' |
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254 | je prog2 |
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255 | cmp al, '9' |
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11 | daniel-mar | 256 | je exit |
9 | daniel-mar | 257 | |
258 | ; Invalid input |
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259 | jmp retry |
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260 | |||
261 | prog1: |
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262 | ; Clear screen |
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263 | call clear_vga |
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264 | |||
265 | ; Setup parameter block for the EXEC command |
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266 | call setup_paramblk |
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267 | |||
268 | ; Start game 1 |
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11 | daniel-mar | 269 | mov ah, 4Bh ; execute |
270 | mov al, 00h ; load and execute |
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9 | daniel-mar | 271 | mov bx, paramblk |
272 | lea dx, exename1 |
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273 | int 21h |
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274 | |||
17 | daniel-mar | 275 | ; Is everything OK? Or is the GAM file missing? |
276 | jc error |
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277 | |||
11 | daniel-mar | 278 | ; Notify the player that the game has finished |
9 | daniel-mar | 279 | jmp gameover |
280 | |||
281 | prog2: |
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282 | ; Clear screen |
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283 | call clear_vga |
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284 | |||
285 | ; Setup parameter block for the EXEC command |
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286 | call setup_paramblk |
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287 | |||
288 | ; Start game 2 |
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11 | daniel-mar | 289 | mov ah, 4Bh ; execute |
290 | mov al, 00h ; load and execute |
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9 | daniel-mar | 291 | mov bx, paramblk |
292 | lea dx, exename2 |
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293 | int 21h |
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17 | daniel-mar | 294 | |
295 | ; Is everything OK? Or is the GAM file missing? |
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296 | jc error |
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9 | daniel-mar | 297 | |
11 | daniel-mar | 298 | ; Notify the player that the game has finished |
9 | daniel-mar | 299 | jmp gameover |
11 | daniel-mar | 300 | |
17 | daniel-mar | 301 | error: |
302 | ; Video Mode VGA 12 |
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303 | call set_screen12 |
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304 | |||
305 | ; Print error |
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306 | call print_error_screen |
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307 | |||
308 | ; Give the player time to read the error message (approx 5 seconds) |
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309 | call sleep_5 |
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310 | |||
311 | ; Go back to the menu |
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312 | jmp menu |
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313 | |||
9 | daniel-mar | 314 | gameover: |
23 | daniel-mar | 315 | ; Print gameover message |
316 | call print_gameover_message |
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9 | daniel-mar | 317 | |
11 | daniel-mar | 318 | ; Give the player time to read the game over message (approx 5 seconds) |
319 | call sleep_5 |
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9 | daniel-mar | 320 | |
11 | daniel-mar | 321 | ; Go back to the menu |
9 | daniel-mar | 322 | jmp menu |
323 | |||
11 | daniel-mar | 324 | exit: |
9 | daniel-mar | 325 | ; Reset video mode to DOS default |
11 | daniel-mar | 326 | pop ax ; the video mode we have preserved at program start |
327 | mov ah, 0 ; set screen mode |
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9 | daniel-mar | 328 | int 10h |
329 | |||
330 | ; Return to DOS |
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11 | daniel-mar | 331 | call exit_to_dos |
9 | daniel-mar | 332 | |
11 | daniel-mar | 333 | ; ------------------------------------------------------- |
334 | |||
9 | daniel-mar | 335 | end start |