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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 |
164 | ; Move cursor to 0, 0 |
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165 | mov ah, 02h ; set cursor position |
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166 | mov dh, 0 ; line |
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167 | mov dl, 0 ; column |
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168 | mov bh, 0 ; page |
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169 | int 10h |
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170 | |||
171 | ; Set background color |
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172 | mov bl, 8 ; dark green background |
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173 | call set_bg_color |
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174 | |||
175 | ; Set text color |
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176 | mov cl, 0Fh ; white font |
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9 | daniel-mar | 177 | lea dx, menu1 |
22 | daniel-mar | 178 | call print_color_string |
179 | |||
11 | daniel-mar | 180 | ret |
181 | print_menu_screen ENDP |
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182 | |||
17 | daniel-mar | 183 | print_error_screen PROC |
22 | daniel-mar | 184 | ; Move cursor to 0, 0 |
185 | mov ah, 02h ; set cursor position |
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186 | mov dh, 0 ; line |
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187 | mov dl, 0 ; column |
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188 | mov bh, 0 ; page |
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21 | daniel-mar | 189 | int 10h |
190 | |||
22 | daniel-mar | 191 | ; Set background color |
192 | mov bl, 4 ; dark red background |
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193 | call set_bg_color |
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194 | |||
195 | ; Set text color |
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196 | mov cl, 0Fh ; white font |
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17 | daniel-mar | 197 | lea dx, error1 |
22 | daniel-mar | 198 | call print_color_string |
199 | |||
17 | daniel-mar | 200 | ret |
201 | print_error_screen ENDP |
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202 | |||
11 | daniel-mar | 203 | print_gameover_screen PROC |
22 | daniel-mar | 204 | ; Keep cursor position |
21 | daniel-mar | 205 | |
22 | daniel-mar | 206 | ; Set background color |
207 | mov bl, 4 ; dark red background |
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208 | call set_bg_color |
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209 | |||
210 | ; Set text color |
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211 | mov cl, 0Fh ; white font |
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11 | daniel-mar | 212 | lea dx, gameover1 |
22 | daniel-mar | 213 | call print_color_string |
214 | |||
11 | daniel-mar | 215 | ret |
216 | print_gameover_screen ENDP |
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217 | |||
218 | ; ------------------------------------------------------- |
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219 | |||
220 | start: |
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221 | ; Setup data segment |
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222 | mov ax, @data ; moving base address of data to ax |
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223 | mov ds, ax ; moving contents of ax into ds |
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224 | ; data section now gets initialized |
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225 | |||
226 | ; Preserve the original screen mode |
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227 | mov ah, 0Fh ; Query screen mode |
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228 | int 10h |
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229 | push ax ; actually, we are only interested in register al (screen mode), not in ah (column count) |
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9 | daniel-mar | 230 | |
11 | daniel-mar | 231 | ; Change numlock to ON |
232 | ; DOSBox has a bug where the NumLock is not correctly set to the setting of the host system, |
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233 | ; so you have to press the NumLock key twice so that DOSBox recognizes the status. |
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234 | ; see: https://sourceforge.net/p/dosbox/bugs/71/ |
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235 | ; https://superuser.com/questions/255102/is-there-a-way-to-use-the-numeric-keypad-in-dosbox/1146986 |
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236 | ; Since the game uses number keys very often, we set NumLock to ON |
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237 | call set_numlock_on |
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238 | |||
239 | ; Reduce size of own application to give the called applications more space |
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240 | ; see https://stackoverflow.com/a/10067627 |
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241 | mov ah, 4Ah |
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14 | daniel-mar | 242 | mov bx, 100 ; 100 paragraphs a 16 bytes = 1600 bytes |
11 | daniel-mar | 243 | int 21h |
244 | |||
245 | menu: |
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246 | ; Video Mode VGA 12 |
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247 | call set_screen12 |
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248 | |||
249 | ; Flush keyboard buffer |
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250 | call flush_keyb_buf |
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251 | |||
252 | ; Print menu screen |
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253 | call print_menu_screen |
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254 | |||
9 | daniel-mar | 255 | retry: |
256 | ; Query keyboard input |
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11 | daniel-mar | 257 | mov ah, 07h ; Direct character input, without echo |
9 | daniel-mar | 258 | int 21h |
259 | cmp al, '1' |
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260 | je prog1 |
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261 | cmp al, '2' |
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262 | je prog2 |
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263 | cmp al, '9' |
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11 | daniel-mar | 264 | je exit |
9 | daniel-mar | 265 | |
266 | ; Invalid input |
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267 | jmp retry |
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268 | |||
269 | prog1: |
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270 | ; Clear screen |
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271 | call clear_vga |
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272 | |||
273 | ; Setup parameter block for the EXEC command |
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274 | call setup_paramblk |
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275 | |||
276 | ; Start game 1 |
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11 | daniel-mar | 277 | mov ah, 4Bh ; execute |
278 | mov al, 00h ; load and execute |
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9 | daniel-mar | 279 | mov bx, paramblk |
280 | lea dx, exename1 |
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281 | int 21h |
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282 | |||
17 | daniel-mar | 283 | ; Is everything OK? Or is the GAM file missing? |
284 | jc error |
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285 | |||
11 | daniel-mar | 286 | ; Notify the player that the game has finished |
9 | daniel-mar | 287 | jmp gameover |
288 | |||
289 | prog2: |
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290 | ; Clear screen |
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291 | call clear_vga |
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292 | |||
293 | ; Setup parameter block for the EXEC command |
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294 | call setup_paramblk |
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295 | |||
296 | ; Start game 2 |
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11 | daniel-mar | 297 | mov ah, 4Bh ; execute |
298 | mov al, 00h ; load and execute |
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9 | daniel-mar | 299 | mov bx, paramblk |
300 | lea dx, exename2 |
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301 | int 21h |
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17 | daniel-mar | 302 | |
303 | ; Is everything OK? Or is the GAM file missing? |
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304 | jc error |
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9 | daniel-mar | 305 | |
11 | daniel-mar | 306 | ; Notify the player that the game has finished |
9 | daniel-mar | 307 | jmp gameover |
11 | daniel-mar | 308 | |
17 | daniel-mar | 309 | error: |
310 | ; Video Mode VGA 12 |
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311 | call set_screen12 |
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312 | |||
313 | ; Clear screen |
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314 | ; call clear_vga |
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315 | |||
316 | ; Print error |
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317 | call print_error_screen |
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318 | |||
319 | ; Give the player time to read the error message (approx 5 seconds) |
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320 | call sleep_5 |
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321 | |||
322 | ; Go back to the menu |
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323 | jmp menu |
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324 | |||
9 | daniel-mar | 325 | gameover: |
11 | daniel-mar | 326 | ; Print gameover screen |
327 | call print_gameover_screen |
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9 | daniel-mar | 328 | |
11 | daniel-mar | 329 | ; Give the player time to read the game over message (approx 5 seconds) |
330 | call sleep_5 |
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9 | daniel-mar | 331 | |
11 | daniel-mar | 332 | ; Go back to the menu |
9 | daniel-mar | 333 | jmp menu |
334 | |||
11 | daniel-mar | 335 | exit: |
9 | daniel-mar | 336 | ; Reset video mode to DOS default |
11 | daniel-mar | 337 | pop ax ; the video mode we have preserved at program start |
338 | mov ah, 0 ; set screen mode |
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9 | daniel-mar | 339 | int 10h |
340 | |||
341 | ; Return to DOS |
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11 | daniel-mar | 342 | call exit_to_dos |
9 | daniel-mar | 343 | |
11 | daniel-mar | 344 | ; ------------------------------------------------------- |
345 | |||
9 | daniel-mar | 346 | end start |