projects / avrcpm.git / blame
| Commit | Line | Data |
|---|---|---|
| 072e0f3b L |
1 | ; CP/M BIOS for avrcpm\r |
| 2 | ; Copyright (C) 2010 Sprite_tm\r | |
| 3 | ;\r | |
| 4 | ; This program is free software: you can redistribute it and/or modify\r | |
| 5 | ; it under the terms of the GNU General Public License as published by\r | |
| 6 | ; the Free Software Foundation, either version 3 of the License, or\r | |
| 7 | ; (at your option) any later version.\r | |
| 8 | ;\r | |
| 9 | ; This program is distributed in the hope that it will be useful,\r | |
| 10 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of\r | |
| 11 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\r | |
| 12 | ; GNU General Public License for more details.\r | |
| 13 | ;\r | |
| 14 | ; You should have received a copy of the GNU General Public License\r | |
| 15 | ; along with this program. If not, see <http://www.gnu.org/licenses/>.\r | |
| 16 | ;\r | |
| 17 | ; $Id: bios.asm 71 2010-08-06 19:38:10Z leo $\r | |
| 18 | ;\r | |
| 19 | \r | |
| 20 | msize equ 62 ;size of available RAM in k\r | |
| 21 | \r | |
| 22 | bias equ (msize-20) * 1024 \r | |
| 23 | ccp equ 3400h+bias ;base of cpm ccp\r | |
| 24 | bdos equ ccp+806h ;base of bdos\r | |
| 25 | bios equ ccp+1600h ;base of bios\r | |
| 26 | cdisk equ 0004h ;current disk number (0 ... 15)\r | |
| 27 | iobyte equ 0003h ;intel iobyte\r | |
| 28 | buff equ 0080h ;default buffer address\r | |
| 29 | retry equ 3 ;max retries on disk i/o before error\r | |
| 30 | \r | |
| 31 | cr equ 13\r | |
| 32 | lf equ 10\r | |
| 33 | \r | |
| 34 | READ_FUNC equ 7\r | |
| 35 | WRITE_FUNC equ 6\r | |
| 36 | BOOT_FUNC equ 5\r | |
| 37 | HOME_FUNC equ 4\r | |
| 38 | \r | |
| 39 | \r | |
| 40 | aseg\r | |
| 41 | org 100h\r | |
| 42 | .phase bios\r | |
| 43 | .z80\r | |
| 44 | \r | |
| 45 | nsects equ ($-ccp)/128 ;warm start sector count\r | |
| 46 | \r | |
| 47 | jp boot\r | |
| 48 | wboote: \r | |
| 49 | jp wboot\r | |
| 50 | jp const\r | |
| 51 | jp conin\r | |
| 52 | jp conout\r | |
| 53 | jp list\r | |
| 54 | jp punch\r | |
| 55 | jp reader\r | |
| 56 | jp home\r | |
| 57 | jp seldsk\r | |
| 58 | jp settrk\r | |
| 59 | jp setsec\r | |
| 60 | jp setdma\r | |
| 61 | jp read\r | |
| 62 | jp write\r | |
| 63 | jp listst\r | |
| 64 | jp sectran\r | |
| 65 | \r | |
| 66 | .8080\r | |
| 67 | maclib AVRCPM.LIB\r | |
| 68 | \r | |
| 69 | ;Drive A B C D E F G H I J K L\r | |
| 70 | dphtab: dtbl <dpha,dphb,dphc,dphd, , , , ,dphi,dphj,dphk,dphl>\r | |
| 71 | \r | |
| 72 | ; Name spt bls dks dir cks off\r | |
| 73 | dpb0: dpb dpb243, 26, 1024, 243, 64, 64, 2\r | |
| 74 | dpb dp8192s,32, 4096,2046, 512, 512, 2\r | |
| 75 | dpb dp8192, 32, 4096,2046,1024,1024, 2\r | |
| 76 | ; dpb dpbrd, 32, 1024, 56, 32, 0, 2\r | |
| 77 | dpb rd1016, 32, 2048, 508, 192, 0, 2\r | |
| 78 | dpb rd1024, 32, 2048, 512, 192, 0, 0\r | |
| 79 | dpb rd0960, 32, 2048, 480, 192, 0, 0\r | |
| 80 | \r | |
| 81 | ;dpha: dph dpb243\r | |
| 82 | ;dphb: dph dpb243\r | |
| 83 | ;dphc: dph dpb243\r | |
| 84 | ;dphd: dph dpb243\r | |
| 85 | dpha: dph dp8192s\r | |
| 86 | dphb: dph dp8192s\r | |
| 87 | dphc: dph dp8192\r | |
| 88 | dphd: dph dp8192\r | |
| 89 | dphi: dph rd1016\r | |
| 90 | dphj: dph rd1024\r | |
| 91 | dphk: dph rd1024\r | |
| 92 | dphl: dph rd0960\r | |
| 93 | \r | |
| 94 | .z80\r | |
| 95 | \r | |
| 96 | signon:\r | |
| 97 | db cr,lf\r | |
| 98 | db msize/10+'0'\r | |
| 99 | db msize - (msize/10)*10 + '0' ;modulo doesn't work?\r | |
| 100 | db "k cp/m vers 2.2"\r | |
| 101 | msgnl: db cr,lf,0\r | |
| 102 | \r | |
| 103 | const:\r | |
| 104 | in a,(0)\r | |
| 105 | ret\r | |
| 106 | \r | |
| 107 | conin:\r | |
| 108 | in a,(0)\r | |
| 109 | cp 0ffh\r | |
| 110 | jp nz,conin\r | |
| 111 | \r | |
| 112 | in a,(1)\r | |
| 113 | ret\r | |
| 114 | \r | |
| 115 | conout:\r | |
| 116 | ld a,c\r | |
| 117 | out (2),a\r | |
| 118 | ret\r | |
| 119 | \r | |
| 120 | list:\r | |
| 121 | ret\r | |
| 122 | \r | |
| 123 | listst:\r | |
| 124 | ld a,0\r | |
| 125 | ret\r | |
| 126 | \r | |
| 127 | punch:\r | |
| 128 | ret\r | |
| 129 | \r | |
| 130 | reader:\r | |
| 131 | ld a,01Fh\r | |
| 132 | ret\r | |
| 133 | \r | |
| 134 | prmsg:\r | |
| 135 | ld a,(hl)\r | |
| 136 | or a\r | |
| 137 | ret z\r | |
| 138 | push hl\r | |
| 139 | ld c,a\r | |
| 140 | call conout\r | |
| 141 | pop hl\r | |
| 142 | inc hl\r | |
| 143 | jp prmsg\r | |
| 144 | \r | |
| 145 | prhex:\r | |
| 146 | ld a,c\r | |
| 147 | push af\r | |
| 148 | rra \r | |
| 149 | rra \r | |
| 150 | rra \r | |
| 151 | rra \r | |
| 152 | call prhexdigit\r | |
| 153 | pop af\r | |
| 154 | ; fall thru\r | |
| 155 | \r | |
| 156 | prhexdigit:\r | |
| 157 | and 00fh\r | |
| 158 | cp 10\r | |
| 159 | jp c,prd1\r | |
| 160 | add a,7\r | |
| 161 | prd1:\r | |
| 162 | add a,'0'\r | |
| 163 | ld c,a\r | |
| 164 | jp conout\r | |
| 165 | \r | |
| 166 | \r | |
| 167 | boot:\r | |
| 168 | ld sp,buff\r | |
| 169 | ld hl,signon\r | |
| 170 | call prmsg\r | |
| 171 | \r | |
| 172 | xor a\r | |
| 173 | ld (bootdsk),a\r | |
| 174 | ld e,a\r | |
| 175 | ld a,(dpb0)\r | |
| 176 | ld (bootspt),a\r | |
| 177 | \r | |
| 178 | ld c,'I'-'A'\r | |
| 179 | call seldsk\r | |
| 180 | ld a,h\r | |
| 181 | or l\r | |
| 182 | jp z,boot1\r | |
| 183 | \r | |
| 184 | ld de,10\r | |
| 185 | add hl,de\r | |
| 186 | ld e,(hl)\r | |
| 187 | inc hl\r | |
| 188 | ld d,(hl) ;de = dpb of first ram disk\r | |
| 189 | \r | |
| 190 | ; Check, if we have reserved tracks.\r | |
| 191 | \r | |
| 192 | ld hl,13\r | |
| 193 | add hl,de\r | |
| 194 | \r | |
| 195 | ld a,(hl) ;# of reserved tracks \r | |
| 196 | inc hl\r | |
| 197 | or (hl)\r | |
| 198 | jp z,boot1 ;Skip if not.\r | |
| 199 | \r | |
| 200 | ; Save CPM to ram disk.\r | |
| 201 | \r | |
| 202 | ld a,(de) ;sectors per track\r | |
| 203 | ld (bootspt),a\r | |
| 204 | ld a,'I'-'A'\r | |
| 205 | ld (bootdsk),a\r | |
| 206 | call home\r | |
| 207 | ld b,nsects\r | |
| 208 | ld c,0 ;track\r | |
| 209 | ld d,1 ;sektor (0 based, skip ipl)\r | |
| 210 | ld hl,ccp\r | |
| 211 | store1:\r | |
| 212 | push bc\r | |
| 213 | push de\r | |
| 214 | push hl\r | |
| 215 | ld c,d\r | |
| 216 | ld b,0\r | |
| 217 | call setsec\r | |
| 218 | pop bc ;dma\r | |
| 219 | push bc\r | |
| 220 | call setdma\r | |
| 221 | ld c,0\r | |
| 222 | call write\r | |
| 223 | \r | |
| 224 | pop hl ;dma\r | |
| 225 | ld de,128\r | |
| 226 | add hl,de\r | |
| 227 | pop de ;d = sec\r | |
| 228 | pop bc ;b = # of secs, c = track\r | |
| 229 | dec b\r | |
| 230 | jp z,boot1\r | |
| 231 | \r | |
| 232 | inc d\r | |
| 233 | ld a,(bootspt)\r | |
| 234 | dec a\r | |
| 235 | cp d ;if sector >= spt then change tracks\r | |
| 236 | jp nc,store1\r | |
| 237 | \r | |
| 238 | ld d,0\r | |
| 239 | inc c\r | |
| 240 | push bc\r | |
| 241 | push de\r | |
| 242 | push hl\r | |
| 243 | ld b,0\r | |
| 244 | call settrk \r | |
| 245 | pop hl\r | |
| 246 | pop de\r | |
| 247 | pop bc\r | |
| 248 | jp store1\r | |
| 249 | \r | |
| 250 | boot1: \r | |
| 251 | xor a\r | |
| 252 | ld (iobyte),a\r | |
| 253 | ld (cdisk),a\r | |
| 254 | jp gocpm \r | |
| 255 | \r | |
| 256 | wboot: ;re-load CP/M\r | |
| 257 | ld sp,buff\r | |
| 258 | ld a,1 shl BOOT_FUNC ;init (de)blocking\r | |
| 259 | out (22),a\r | |
| 260 | ld a,(bootdsk)\r | |
| 261 | ld c,a\r | |
| 262 | call seldsk\r | |
| 263 | call home\r | |
| 264 | ld b,nsects\r | |
| 265 | ld c,0 ;track\r | |
| 266 | ld d,1 ;sektor (0 based)\r | |
| 267 | ld hl,ccp\r | |
| 268 | load1:\r | |
| 269 | push bc\r | |
| 270 | push de\r | |
| 271 | push hl\r | |
| 272 | ld c,d\r | |
| 273 | ld b,0\r | |
| 274 | call setsec\r | |
| 275 | pop bc\r | |
| 276 | push bc\r | |
| 277 | call setdma\r | |
| 278 | call read\r | |
| 279 | cp 0 ;read error?\r | |
| 280 | jp nz,wboot\r | |
| 281 | \r | |
| 282 | pop hl\r | |
| 283 | ld de,128\r | |
| 284 | add hl,de\r | |
| 285 | pop de\r | |
| 286 | pop bc\r | |
| 287 | dec b\r | |
| 288 | jp z,gocpm\r | |
| 289 | \r | |
| 290 | inc d\r | |
| 291 | ld a,(bootspt)\r | |
| 292 | dec a\r | |
| 293 | cp d ;if sector >= spt then change tracks\r | |
| 294 | jp nc,load1\r | |
| 295 | \r | |
| 296 | ld d,0\r | |
| 297 | inc c\r | |
| 298 | push bc\r | |
| 299 | push de\r | |
| 300 | push hl\r | |
| 301 | ld b,0\r | |
| 302 | call settrk \r | |
| 303 | pop hl\r | |
| 304 | pop de\r | |
| 305 | pop bc\r | |
| 306 | jp load1\r | |
| 307 | \r | |
| 308 | gocpm:\r | |
| 309 | ld a,0c3h\r | |
| 310 | ld (0),a\r | |
| 311 | ld hl,wboote\r | |
| 312 | ld (1),hl\r | |
| 313 | ld (5),a\r | |
| 314 | ld hl,bdos\r | |
| 315 | ld (6),hl\r | |
| 316 | \r | |
| 317 | ld bc,buff\r | |
| 318 | call setdma\r | |
| 319 | ld a,(cdisk)\r | |
| 320 | ld c,a\r | |
| 321 | jp ccp\r | |
| 322 | \r | |
| 323 | msgSel: db 13,10,"Sel: ",0\r | |
| 324 | \r | |
| 325 | seldsk:\r | |
| 326 | ld hl,dphtab\r | |
| 327 | ld b,0\r | |
| 328 | add hl,bc\r | |
| 329 | add hl,bc\r | |
| 330 | ld a,(hl) ;get table entry for selected disk\r | |
| 331 | inc hl\r | |
| 332 | ld h,(hl)\r | |
| 333 | ld l,a \r | |
| 334 | or h ;no entry, no disk\r | |
| 335 | ret z ;\r | |
| 336 | \r | |
| 337 | ld a,c\r | |
| 338 | out (15),a\r | |
| 339 | \r | |
| 340 | ld a,e ;reselection bit\r | |
| 341 | rrca\r | |
| 342 | ret c\r | |
| 343 | \r | |
| 344 | ; First select after (w)boot \r | |
| 345 | \r | |
| 346 | in a,(15) ;querry, if disk exists\r | |
| 347 | or a ;0 = disk is ok\r | |
| 348 | ret z\r | |
| 349 | ld hl,0 ;error return code\r | |
| 350 | ret\r | |
| 351 | \r | |
| 352 | home:\r | |
| 353 | ld a,1 shl HOME_FUNC\r | |
| 354 | out (22),a\r | |
| 355 | \r | |
| 356 | ld bc,0 ; same as seek to track 0\r | |
| 357 | settrk:\r | |
| 358 | ld a,c\r | |
| 359 | out (16),a\r | |
| 360 | ld a,b\r | |
| 361 | out (17),a\r | |
| 362 | ret\r | |
| 363 | \r | |
| 364 | setsec:\r | |
| 365 | ld a,c\r | |
| 366 | out (18),a\r | |
| 367 | ret\r | |
| 368 | \r | |
| 369 | setdma:\r | |
| 370 | ld a,c\r | |
| 371 | out (20),a\r | |
| 372 | ld a,b\r | |
| 373 | out (21),a\r | |
| 374 | ret\r | |
| 375 | \r | |
| 376 | read:\r | |
| 377 | ld a,1 shl READ_FUNC\r | |
| 378 | out (22),a\r | |
| 379 | in a,(22)\r | |
| 380 | and 1\r | |
| 381 | ret\r | |
| 382 | \r | |
| 383 | write:\r | |
| 384 | ld a,c\r | |
| 385 | and 3 ;mask write type\r | |
| 386 | or 1 shl WRITE_FUNC\r | |
| 387 | out (22),a\r | |
| 388 | in a,(22)\r | |
| 389 | and 1\r | |
| 390 | ret\r | |
| 391 | \r | |
| 392 | sectran:\r | |
| 393 | ;translate sector bc using table at de, res into hl\r | |
| 394 | ld h,b\r | |
| 395 | ld l,c\r | |
| 396 | ld a,d\r | |
| 397 | or e\r | |
| 398 | ret z\r | |
| 399 | ex de,hl\r | |
| 400 | add hl,bc\r | |
| 401 | ld l,(hl)\r | |
| 402 | ld h,0\r | |
| 403 | ret\r | |
| 404 | \r | |
| 405 | bootdsk:ds 1\r | |
| 406 | bootspt:ds 1\r | |
| 407 | \r | |
| 408 | .8080\r | |
| 409 | endef\r | |
| 410 | \r | |
| 411 | end\r | |
| 412 | \r |