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GeezerVison is showing github.com — Sega-Nuclear-Rush/STARTUP.ASM at master · OldSkoolCode/Sega-Nuclear-Rush Expand file tree/ Copy pathSTARTUP.ASMMore file actions executable file ·796 lines (707 loc) · 22.7 KB / Copy pathSTARTUP.ASMFile metadata and controlsexecutable file ·796 lines (707 loc) · 22.7 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 * * Startup Code. * INCLUDE equates.inc INCLUDE segalib.inc INCLUDE variable.inc INCLUDE sega.i WCES94 equ 1 ; Winter '94 CES kludges... OPT LLBL XDEF __exit XREF load_tbl,_main XREF VDPSlaves,CellMapCols,CellMapRows XDEF _SYS_HARDWARE ; Genesis Hardware Version Number BSECTION .bss _SYS_HARDWARE ds.w 1 TSECTION .text ************************************************************************* * * All exception vectors: * ************************************************************************* DS.L 0 ; Alignment INITSTK: DC.L $00000000 ; Stack address INITPC: DC.L START ; Program start address DC.L Buserr DC.L Addrerr DC.L Ilglinst DC.L Zdivide DC.L Chkreg DC.L Overflow DC.L Privviol DC.L Uninitv DS.B 16*4 AUTO_2: DC.L ExtInt DS.B 4 AUTO_4: DC.L Hint DS.B 4 AUTO_6: DC.L Vblank DS.B $88-4 ************************************************************************* * * The SEGA header: * ************************************************************************* * 0 1 2 3 4 5 * 12345678901234567890123456789012345678901234567890 DC.B 'SEGA GENESIS ' DC.B '(C)SEGA 1993.AUG' DC.B 'NUCLEAR RUSH ' DC.B 'NUCLEAR RUSH ' DC.B 'GM MK-1831-00 ' DC.W 0 DC.B 'J ' DC.L $00000000 DC.L $00200000 DC.L $FFFF0000 DC.L $FFFFFFFF DC.B ' ' DC.B ' ' DC.B ' ' DC.B 'U ' * * * MEGA DRIVE hard initial program * * 1990 6/6 * R/D 5 * * ++++++++++++++++++++++++++++++++++++++++++++++++++ * + status of MEGA_DRIVE on program_finished + * ++++++++++++++++++++++++++++++++++++++++++++++++++ * * ****************** 68000 ******************* * --------- CAUTION ----------- * When program end * * 68000 set RESET to Z80 ($A11100=0,$A11200=$000) * * Z80 wait [ JP (HL) ] command ( HL=0000 ) * * ************************************************************* * * * * * ICD_END is GAME_PROGRAM start_address * * * ICD_END = START+$100 * * * this program size is just 256 byte. * * * * * ************************************************************* ;program start START: tst.l $a10008 ; power on check cntl_A,cntl_B bne.s h_s ; reset hot_start tst.w $a1000c ; power on check cntl_C h_s: bne.s hot_start ; reset hot_start cold_start: ; power on (cold_start) lea.l reg_set(pc),a5 ;register set table movem.w (a5)+,d5-d7 ; d5/d6/d7 movem.l (a5)+,a0-a4 ; a0-a5 security: ; ** a1=$a11100 ** move.b -$10ff(a1),d0 ;-$1101(a1)=$a10000 andi.b #$000f,d0 ;Ver.No check beq.s japan move.l #'SEGA',$2f00(a1) * security part move "SEGA" japan: ; $2F00(A1)=$A14000 reg_ini: move (a4),d0 ;VDP STATUS DUMMY READ (D5=$8000) moveq #0,d0 ; D0 set 0 move.l d0,a6 ; A6 $00000000 move.l a6,usp ; User Stack Pointer moveq #23,d1 ; D1 count VDP_command r_ini1: move.b (a5)+,d5 ;REG 0-23 SET (DMA FILL SET) move.w d5,(a4) ; add d7,d5 ; d7=$100 dbra d1,r_ini1 dma_fill: ;already set REG#18,19,23 move.l (a5)+,(a4) ;dma fill(VDP_VRAM CLEAR) move d0,(a3) ;fill data set $0,$C00000 z80_clr: ;Z80 self_initial move d7,(a1) ; Z80_BUSREQ ON move d7,(a2) ; Z80_RESET OFF z801: btst d0,(a1) ; Z80_BGACK CHECK ? bne.s z801 moveq #37,d2 ; D2 is Z80_program's size z802: move.b (a5)+,(a0)+ ; move.B (z80_prg)+,($a00000)+ dbra d2,z802 move d0,(a2) ; Z80_RESET ON move d0,(a1) ; Z80_BUSREQ OFF move d7,(a2) ; Z80_RESET OFF(Z80 start) clr_wk: ;A6=$0 D0=$0 D6=$3FFF c_wk1: move.l d0,-(a6) ;wrok ram clear dbra d6,c_wk1 ; clr_col move.l (a5)+,(a4) ;VDP REG#1=04,#15=02 move.l (a5)+,(a4) ;a3=$c00000 a4=$c00004 d0=$0 moveq #$1f,d3 ; d3 is color_ram's size/2(WORD) c_col1: move.l d0,(a3) ;vdp_color clear dbra d3,c_col1 clr_vsc: move.l (a5)+,(a4) ;a3=$c00000 a4=$c00004 d0=$0 moveq #19,d4 ; d4 count Vscroll_ram c_vsc1: move.l d0,(a3) ;vdp_vscroll clear dbra d4,c_vsc1 clr_psg: moveq #3,d5 ; d5 is byte_size of PSG init_DATA c_psg1: move.b (a5)+,$11(a3) ;PSG_SOUND clear dbra d5,c_psg1 move d0,(a2) ;Z80 RESET movem.l (a6),d0-d7/a0-a6 ;register all initial move #$2700,sr ;68000 register initial hot_start: bra.s chk_vdp ; init_end: reg_set: dc.w $008000,$003fff,$000100 ;d5/d6/d7 dc.l $a00000,$a11100,$a11200,$c00000 ;a0-a3 dc.l $c00004 ;a4 vreg_dt: dc.b $04,$14,$30,$3c,$07,$6c,$00,$00 ;VDP REG #0-7 dc.b $00,$00,$ff,$00,$81,$37,$00,$01 ;VDP_REG #8-15 dc.b $01,$00,$00,$ff,$ff,$00,$00,$80 ;VDP_REG #16-23 dma_fill_data: dc.l $40000080 ;dma fill(VDP_VRAM clear) z80_prg: DC.B $AF ;XOR A DC.B $01,$D9,$1F ;LD BC,1FD9H DC.B $11,$27,$00 ;LD DE,0027H DC.B $21,$26,$00 ;LD HL,0026H DC.B $F9 ;LD SP,HL DC.B $77 ;LD (HL),A DC.B $ED,$B0 ;LDIR DC.B $DD,$E1 ;POP IX DC.B $FD,$E1 ;POP IY DC.B $ED,$47 ;LD I,A DC.B $ED,$4F ;LD R,A DC.B $D1 ;POP DE DC.B $E1 ;POP HL DC.B $F1 ;POP AF DC.B $08 ;EX AF,AF' DC.B $D9 ;EXX DC.B $C1 ;POP BC DC.B $D1 ;POP DE DC.B $E1 ;POP HL DC.B $F1 ;POP AF DC.B $F9 ;LD SP,HL DC.B $F3 ;DI DC.B $ED,$56 ;IM1 DC.B $36,$E9 ;LD (HL),$E9='JP (HL)' DC.B $E9 ;JP (HL) new_reg_data: dc.l $81048f02 ;VDP REG#1=04,#15=02 clr_col_data: dc.l $c0000000 ;color_ram address data clr_vsc_data: dc.l $40000010 ;v_scroll ram address data psg_dat: DC.B $9F,$BF,$DF,$FF ;PSG initial data chk_vdp: tst $c00004 ICD_END: * Sega Lock Out code... nop bsr WaitForDMA ; Idiots didn't put this in the lock out code! DC.B $42,$80,$10,$39,$00,$A1,$00,$01,$EC,$08,$02,$00,$00,$03,$41,$FA DC.B $01,$26,$10,$30,$00,$00,$4A,$00,$67,$00,$00,$E4,$41,$F9,$00,$00 DC.B $01,$F0,$32,$3C,$00,$0F,$B0,$10,$67,$00,$03,$66,$52,$88,$51,$C9 DC.B $FF,$F6,$49,$F9,$00,$C0,$00,$00,$4B,$F9,$00,$C0,$00,$04,$3A,$BC DC.B $81,$64,$3A,$BC,$82,$30,$3A,$BC,$8C,$81,$3A,$BC,$8F,$02,$3A,$BC DC.B $90,$01,$2A,$BC,$C0,$02,$00,$00,$38,$BC,$0E,$EE,$2A,$BC,$40,$00 DC.B $00,$00,$41,$FA,$01,$54,$30,$3C,$00,$3A,$24,$3C,$10,$00,$00,$00 DC.B $3C,$3C,$00,$07,$12,$18,$28,$3C,$00,$00,$00,$00,$3A,$3C,$00,$07 DC.B $E9,$9A,$E2,$19,$64,$02,$88,$82,$51,$CD,$FF,$F6,$28,$84,$51,$CE DC.B $FF,$E4,$51,$C8,$FF,$DC,$12,$3C,$00,$08,$41,$FA,$00,$B2,$10,$18 DC.B $61,$00,$00,$5E,$43,$F9,$00,$00,$01,$F0,$0C,$11,$00,$20,$67,$42 DC.B $45,$FA,$00,$88,$38,$1A,$4A,$04,$67,$34,$B8,$11,$66,$2C,$0C,$29 DC.B $00,$20,$00,$01,$66,$14,$B3,$FC,$00,$00,$01,$F0,$67,$0C,$41,$FA DC.B $00,$9B,$10,$18,$52,$41,$61,$00,$00,$28,$41,$FA,$00,$5A,$D1,$DA DC.B $10,$18,$52,$41,$61,$00,$00,$1A,$60,$04,$58,$8A,$60,$C6,$52,$89 DC.B $60,$B8,$41,$FA,$00,$7A,$10,$18,$52,$41,$61,$00,$00,$04,$60,$FE DC.B $14,$01,$02,$82,$00,$00,$00,$FF,$48,$42,$EF,$8A,$16,$00,$02,$83 DC.B $00,$00,$00,$FF,$48,$43,$E3,$83,$D4,$83,$06,$82,$40,$00,$00,$03 DC.B $2A,$82,$4A,$10,$67,$0E,$14,$18,$04,$02,$00,$20,$02,$42,$00,$FF DC.B $38,$82,$60,$EE,$4E,$75,$4A,$00,$55,$45,$00,$4A,$00,$00,$00,$42 DC.B $00,$55,$00,$00,$00,$53,$00,$45,$00,$00,$00,$61,$00,$00,$06,$44 DC.B $45,$56,$45,$4C,$4F,$50,$45,$44,$20,$46,$4F,$52,$20,$55,$53,$45 DC.B $20,$4F,$4E,$4C,$59,$20,$57,$49,$54,$48,$00,$12,$26,$00,$0F,$53 DC.B $59,$53,$54,$45,$4D,$53,$2E,$00,$0C,$4E,$54,$53,$43,$20,$4D,$45 DC.B $47,$41,$20,$44,$52,$49,$56,$45,$00,$0D,$4E,$54,$53,$43,$20,$47 DC.B $45,$4E,$45,$53,$49,$53,$00,$04,$50,$41,$4C,$20,$41,$4E,$44,$20 DC.B $46,$52,$45,$4E,$43,$48,$20,$53,$45,$43,$41,$4D,$20,$4D,$45,$47 DC.B $41,$20,$44,$52,$49,$56,$45,$00,$00,$00,$00,$00,$00,$00,$00,$00 DC.B $18,$18,$18,$18,$00,$18,$18,$00,$36,$36,$48,$00,$00,$00,$00,$00 DC.B $12,$12,$7F,$12,$7F,$24,$24,$00,$08,$3F,$48,$3E,$09,$7E,$08,$00 DC.B $71,$52,$74,$08,$17,$25,$47,$00,$18,$24,$18,$29,$45,$46,$39,$00 DC.B $30,$30,$40,$00,$00,$00,$00,$00,$0C,$10,$20,$20,$20,$10,$0C,$00 DC.B $30,$08,$04,$04,$04,$08,$30,$00,$00,$08,$2A,$1C,$2A,$08,$00,$00 DC.B $08,$08,$08,$7F,$08,$08,$08,$00,$00,$00,$00,$00,$00,$30,$30,$40 DC.B $00,$00,$00,$7F,$00,$00,$00,$00,$00,$00,$00,$00,$00,$30,$30,$00 DC.B $01,$02,$04,$08,$10,$20,$40,$00,$1E,$33,$33,$33,$33,$33,$1E,$00 DC.B $18,$38,$18,$18,$18,$18,$3C,$00,$3E,$63,$63,$0E,$38,$60,$7F,$00 DC.B $3E,$63,$03,$1E,$03,$63,$3E,$00,$06,$0E,$1E,$36,$66,$7F,$06,$00 DC.B $7E,$60,$7E,$63,$03,$63,$3E,$00,$3E,$63,$60,$7E,$63,$63,$3E,$00 DC.B $3F,$63,$06,$06,$0C,$0C,$18,$00,$3E,$63,$63,$3E,$63,$63,$3E,$00 DC.B $3E,$63,$63,$3F,$03,$63,$3E,$00,$00,$18,$18,$00,$00,$18,$18,$00 DC.B $00,$18,$18,$00,$00,$18,$18,$20,$03,$0C,$30,$40,$30,$0C,$03,$00 DC.B $00,$00,$7F,$00,$7F,$00,$00,$00,$60,$18,$06,$01,$06,$18,$60,$00 DC.B $3E,$63,$03,$1E,$18,$00,$18,$00,$3C,$42,$39,$49,$49,$49,$36,$00 DC.B $1C,$1C,$36,$36,$7F,$63,$63,$00,$7E,$63,$63,$7E,$63,$63,$7E,$00 DC.B $3E,$73,$60,$60,$60,$73,$3E,$00,$7E,$63,$63,$63,$63,$63,$7E,$00 DC.B $3F,$30,$30,$3E,$30,$30,$3F,$00,$3F,$30,$30,$3E,$30,$30,$30,$00 DC.B $3E,$73,$60,$67,$63,$73,$3E,$00,$66,$66,$66,$7E,$66,$66,$66,$00 DC.B $18,$18,$18,$18,$18,$18,$18,$00,$0C,$0C,$0C,$0C,$CC,$CC,$78,$00 DC.B $63,$66,$6C,$78,$6C,$66,$63,$00,$60,$60,$60,$60,$60,$60,$7F,$00 DC.B $63,$77,$7F,$6B,$6B,$63,$63,$00,$63,$73,$7B,$7F,$6F,$67,$63,$00 DC.B $3E,$63,$63,$63,$63,$63,$3E,$00,$7E,$63,$63,$7E,$60,$60,$60,$00 DC.B $3E,$63,$63,$63,$6F,$63,$3F,$00,$7E,$63,$63,$7E,$68,$66,$67,$00 DC.B $3E,$63,$70,$3E,$07,$63,$3E,$00,$7E,$18,$18,$18,$18,$18,$18,$00 DC.B $66,$66,$66,$66,$66,$66,$3C,$00,$63,$63,$63,$36,$36,$1C,$1C,$00 DC.B $6B,$6B,$6B,$6B,$6B,$7F,$36,$00,$63,$63,$36,$1C,$36,$63,$63,$00 DC.B $66,$66,$66,$3C,$18,$18,$18,$00,$7F,$07,$0E,$1C,$38,$70,$7F,$00 MainEntry: nop move.l #$FFFF0000,a0 move.w #65536/4-1,d1 moveq #0,d0 sl_clr: move.l d0,(a0)+ dbra d1,sl_clr ;clear all of the work RAM (NB. will clear a stack!) jsr load_tbl bsr ResetHardware ;set up scrolls interrupts etc move.w #$100,Z80Reset ;Z80 reset line high (NORMAL RUN STATE) jmp _main __exit: bra __exit ************************************************************************** ** SLAVE VDP REGISTERS AND SET UP HARDWARE * ************************************************************************** * This sets up 24 WORDS of work RAM as a 'copy' of the VDP registers. * ICD_BLK4 sets up the hardware in a similar way, without slaving the * VDP registers, but THIS code does slave the registers in work RAM * as the VDP has write only registers (status excepted). It also * enables the display and Vertical interrupts as well as setting up the * VRAM addresses in the VDP. * * Note that with the VRAM containing all 0, this means that all the cell maps * contain references to cell 0, which in turn consists of 32 bytes containing * 0, which is a blank character, so the screen will be background coloured. * In addition, the HScroll table contains the value 0, so the screen is not * scrolled and the first sprite position is 0 and has link data 0, so no * sprites are on screen. (Their pattern generator addresses are all space * character anyway). * * Any characters placed on Pattern A or B will be visible. ResetHardware: move.w #$8104,VCTRL ; Kill display bsr BlackOut ;blank the palette move.b #$00,SCtrl1 ; set parallel mode and clear ints (p75) move.b #$00,SCtrl2 ; set parallel mode and clear ints (p75) move.b #$00,SCtrl3 ; set parallel mode and clear ints (p75) move.b #$40,Ctrl1 move.b #$40,Ctrl2 move.b #$7F,Ctrl3 clr _SYS_HARDWARE ; Get the hardware version number move.b $A10001,_SYS_HARDWARE+1 lea InitialVDP,a0 ;point to VDP initialization data move #$8000,d0 ;register increment moveq #19-1,d1 ;count .loop move.b (a0)+,d0 move d0,VCTRL add.w #$0100,d0 ;increment register dbra d1,.loop ;slave all regs move.w #64,CellMapCols ;set up cell map width move.w #64,CellMapRows ;set up cell map height VramWrtAddr 0,VCTRL move.w #65536/4-1,d1 moveq #0,d0 .cloop move.l d0,VDATA dbra d1,.cloop lea VDPSlaves,a0 move #$8000,d0 ;register increment move #24-1,d1 ;count .xloop move d0,(a0)+ add.w #$0100,d0 ;increment register dbra d1,.xloop ;slave all regs * bsr ClearVRAM ;clear vram (scrolls, hscroll, sprites, cells) bsr ClearVSRAM rts InitialVDP: DC.B %00000100 ; 0 no H interrupt, enable read HV counter DC.B %01110100 ; 1 ENABLE display, ENABLE V interrupt, NO DMA, 28CELL HIGH(NTSC) DC.B ScrollA>>10 ; 2 Pattern Table A DC.B Window>>10 ; 3 Pattern Window DC.B ScrollB>>13 ; 4 Pattern Table B DC.B SpriteAttr>>9 ; 5 Sprite Attributes DC.B 0 ; 6 MUST BE 0 DC.B %00000000 ; 7 Background colour 0 in palette 0 DC.B 0 ; 8 MUST BE 0 DC.B 0 ; 9 MUST BE 0 DC.B %11111111 ;10 H interrupt divider DC.B %00000100 ;11 NO Ext interrupt, 2CELL V scroll, FULL H scroll DC.B %10000001 ;12 40CELL WIDE, NO shadow/hilight, NO interlace DC.B HScroll>>10 ;13 H Scroll Table @62K DC.B 0 ;14 MUST BE 0 DC.B %00000010 ;15 Autoinc = 2 (i.e. increment by WORD) DC.B %00010001 ;16 Scroll size 64 HIGH by 64 WIDE occupies 64*64*2=8K bytes. NB CellMapCols DC.B %00000000 ;17 Window H position = 0 \ => NO window DC.B %00000000 ;18 Window V position = 0 / DS.W 0 ; Align * ERROR EXCEPTION FUNCTIONS - JUST LET US KNOW WHAT WENT WRONG ErrorVect: bra ErrorVect ; We point all unhandled exceptions here XDEF _EHInts _EHInts: move.w #$8014,VCTRL move.w #$2000,SR rts XDEF Vblank *;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; * FUNCTION: Vblank * DESCRIPTION: . * RETURNS: . * PARAMETERS: . * SIDE EFFECTS: USES * REVISIONS: 10/91 -jf- *;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; XREF _SYS_VCNT * XREF _SYS_SENDSPRS XREF _RIGHT_SPRLIST XREF _LEFT_SPRLIST XREF _SYS_HARRAY1 XREF _SYS_HARRAY2 XREF _SYS_HATOGGLE XREF _SYS_HAPTR XREF _SYS_SCROLLX XREF _SYS_SCRLXB ; Scroll for Screen B XREF _SYS_FLICKER XREF _SYS_DOHEADSET XREF _SYS_MINFDIST XREF _SYS_AVGFDIST XREF _CHR_1video_addr XREF _CHR_1length XREF _CHR_1src_addr XREF _CHR_2video_addr XREF _CHR_2length XREF _CHR_2src_addr XREF _CHR_3video_addr XREF _CHR_3length XREF _CHR_3src_addr XREF _SPR_Video_Addr XREF _SPR_Llength XREF _SPR_Lsrc_addr XREF _SPR_Rlength XREF _SPR_Rsrc_addr XREF _SPR_NLlength XREF _SPR_NLsrc_addr XREF _SPR_NRlength XREF _SPR_NRsrc_addr XREF _SYS_HORZCHRS XREF _SYS_HORIZON XREF _SYS_HORZLEN XREF _Player_Fuel XREF _SYS_DCLISTAVL ; List ready to send XREF _SYS_DCLISTLEN ; List length XREF _SYS_DCLIST ; Data or Ctrl flags XREF _SYS_DCDATA ; WORDs to send XREF _SYS_VSCROLL IFNE WCES94 XREF _SYS_VR_MODE ; For WCES '94 ENDC XREF heap_org XREF _HMD_DATA XDEF _SYS_DOCYCLE XDEF _SYS_SAFEDMA XDEF _SYS_NODMA XDEF _SYS_NEWXA XDEF _SYS_NEWXB XDEF _SYS_VLINE XDEF _SYS_READHEAD XDEF _SYS_HMD_DATA XDEF _SYS_HMD_ERROR BSECTION .bss _SYS_HFLAG ds.w 1 _DISP_LEFT ds.w 1 _SYS_DOCYCLE ds.w 1 ; Color Cycle Yello in 4th Palette _SYS_NODMA ds.w 1 ; Don't do any DMA... _SYS_SAFEDMA ds.w 1 ; Flag to say "safe to DMA" _SYS_NEWXA ds.w 1 ; New X scroll from plane A _SYS_NEWXB ds.w 1 ; New X scroll from plane B _SYS_VLINE ds.w 1 ; VCounter AFTER VBlank _SYS_READHEAD ds.w 1 ; Read the headset? _SYS_HMD_DATA ds.l 1 ; Headset Data _SYS_HMD_ERROR ds.l 1 ; Headset Error XDEF _RLEScaleCode XDEF _RLESAddr XDEF _RLEDAddr XDEF _RLEJAddr XDEF _RLEMoves * RLE Scaling Code variables: _RLEScaleCode ds.w 1 ; movea.l #$12345678,a0 _RLESAddr ds.l 1 ; Address to be loaded into A0 ds.w 1 ; movea.l #$12345678,a1 _RLEDAddr ds.l 1 ; Address to be loaded into A1 ds.w 1 ; jmp #$xxxxxxxx _RLEJAddr ds.l 1 ; Address to jump to _RLEMoves ds.w 256*4 ; Rest of code to generate a scanline TSECTION .text YellowCycle: ; Color Register #51 DC.W $00EE,$00CC,$00AA,$0088,$0066,$0044,$0022,$0000 DC.W $0000,$0022,$0044,$0066,$0088,$00AA,$00CC,$00EE Vblank: * btst.b #0,_SYS_VCNT+3 * beq.s .leftx ** Display Right Data * move.b #0,_DISP_LEFT * move.b #2,PPDATA * bra.s .sendx ** Display Left Data *.leftx move.b #$FF,_DISP_LEFT * move.b #1,PPDATA *.sendx: movem.l d0-d7/a0-a6,-(a7) ;save all registers add.l #1,_SYS_VCNT st FlyBackFlag ;flag VBLANK interrupt happened IFNE WCES94 * Handle flickering move.w _SPR_Video_Addr,d0 btst.b #0,_SYS_FLICKER beq.s .showLeft * xxxx|xxxx|xxxx|L R X8 Y8|X7 X6 X5 X4|X3 X2 X1 X0|Y7 Y6 Y5 Y4|Y3 Y2 Y1 Y0 move.l _SYS_HMD_DATA,d2 andi.l #$000C0000,d2 cmp.w #1,_SYS_VR_MODE ; Head Trak Normal Flicker? bne.s .ces2 eori.l #$000C0000,d2 bra.s .cesT .ces2 cmp.w #2,_SYS_VR_MODE ; Head Trak Invert Flicker? bne.s .ces3 .cesT clr _DISP_LEFT cmpi.l #$00080000,d2 seq _DISP_LEFT .ces3 tst _DISP_LEFT beq.s .showLeft move.w _SPR_Rlength,d1 beq.s .doScroll move.l _SPR_Rsrc_addr,a0 bsr CopyToVRAM sf _DISP_LEFT bra.s .doScroll .showLeft st _DISP_LEFT move.w _SPR_Llength,d1 beq.s .doScroll move.l _SPR_Lsrc_addr,a0 bsr CopyToVRAM ELSEC * Handle flickering move.w _SPR_Video_Addr,d0 btst.b #0,_SYS_FLICKER beq.s .showLeft tst _DISP_LEFT beq.s .showLeft move.w _SPR_Rlength,d1 beq.s .doScroll move.l _SPR_Rsrc_addr,a0 bsr CopyToVRAM sf _DISP_LEFT bra.s .doScroll .showLeft st _DISP_LEFT move.w _SPR_Llength,d1 beq.s .doScroll move.l _SPR_Lsrc_addr,a0 bsr CopyToVRAM ENDC * Update X scroll value safely .doScroll move.w #$8F02,VCTRL ; Set autoinc to 2 VramWrtAddr HScroll,VCTRL move _SYS_SCROLLX,d0 move _SYS_SCRLXB,d1 tst.b _SYS_FLICKER beq.s .fhx tst _DISP_LEFT bne.s .fhl sub.w _SYS_MINFDIST,d0 * move.w _SYS_AVGFDIST,d1 * neg d1 bra.s .fhx .fhl add.w _SYS_MINFDIST,d0 * move.w _SYS_AVGFDIST,d1 .fhx move.w d0,VDATA ; Flicker Scroll Screen A move.w d1,VDATA ; Flicker Scroll Screen B * DMA First set of characters... .CHR1DMA tst _SYS_NODMA ; Should we try any DMA? bne .exitDMA move.w _CHR_1length,d1 beq.s .CHR2DMA move.w _CHR_1video_addr,d0 move.l _CHR_1src_addr,a0 bsr CopyToVRAM move.w #0,_CHR_1length move VDPHVCount,_SYS_VLINE ; For debugging bra .exitDMA .CHR2DMA move.w _CHR_2length,d1 beq.s .CHR3DMA move.w _CHR_2video_addr,d0 move.l _CHR_2src_addr,a0 bsr CopyToVRAM move.w #0,_CHR_2length bra .exitDMA .CHR3DMA move.w _CHR_3length,d1 ; sprite attribute table is last beq.s .HORZDMA move.w _CHR_3video_addr,d0 move.l _CHR_3src_addr,a0 bsr CopyToVRAM move.w #0,_CHR_3length bra .exitDMA .HORZDMA move.w _SYS_HORZLEN,d1 ; Send Horizon characters? beq.s .doneDMA move.w _SYS_HORZCHRS,d0 lea _SYS_HORIZON,a0 bsr CopyToVRAM move.w #0,_SYS_HORZLEN .doneDMA * Copy new pointers after DMA is finished tst _SYS_SAFEDMA ; Only update once per frame bne.s .exitDMA move _SPR_NRlength,_SPR_Rlength move.l _SPR_NRsrc_addr,_SPR_Rsrc_addr move _SPR_NLlength,_SPR_Llength move.l _SPR_NLsrc_addr,_SPR_Lsrc_addr move _SYS_NEWXA,_SYS_SCROLLX ; Update scroll values move _SYS_NEWXB,_SYS_SCRLXB move.l #$40000010,VCTRL ; Update Y Scroll values lea _SYS_VSCROLL,a0 move #19,d0 .adjvs move (a0)+,VDATA move #0,VDATA dbra d0,.adjvs st _SYS_SAFEDMA .exitDMA * Do games VDP Data/Ctrl list updating... tst _SYS_DCLISTAVL beq.s .nolist move _SYS_DCLISTLEN,d0 beq.s .nolist lea _SYS_DCLIST,a0 lea _SYS_DCDATA,a1 sub #1,d0 .listlp tst.b (a0)+ bne.s .listd move.w (a1)+,VCTRL bra.s .listt .listd move.w (a1)+,VDATA .listt dbra d0,.listlp move #0,_SYS_DCLISTLEN .nolist bsr ScanJoy1 ;scan joystick tst _SYS_READHEAD bne.s .updFuel bsr ScanJoy2 ;scan other joystick * Update players fuel .updFuel move.l _SYS_VCNT,d0 and #$03FF,d0 bne.s .cyc sub #1,_Player_Fuel * Update Yellow Color Cycle if we need to .cyc tst _SYS_DOCYCLE beq.s .rexit moveq #(3*16+3)*2,d0 ;CRAM palette 3, color 3 bsr SetCRAMWrite ;set write to CRAM move.l _SYS_VCNT,d0 and #$1E,d0 lea YellowCycle,a0 move 0(a0,d0),VDATA .rexit * Do headset read, if needed tst _SYS_READHEAD beq.s .bye btst.b #0,_SYS_VCNT+3 ; Only read the headset and 30Hz beq.s .bye jsr _HMD_DATA move.l d0,_SYS_HMD_DATA .bye movem.l (a7)+,d0-d7/a0-a6 ;get old registers rte XDEF Hint *;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; * FUNCTION: Hint * DESCRIPTION: . * RETURNS: . * PARAMETERS: . * SIDE EFFECTS: USES * REVISIONS: 10/91 -jf- *;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; * DS.W Color value * DS.W Next horizontal line interrupt Hint: tst _SYS_HFLAG ; Change Interrupt counter? bne.s HInorm move.w #$8A01,VCTRL ; Interrupt changed to every other line move.w #1,_SYS_HFLAG bra.s HIexit ; Return back to program HInorm movem.l d0/a0,-(a7) move.l _SYS_HAPTR,a0 move.w #$8F04,VCTRL ; Set Auto increment to 4 move.l #$40000010,VCTRL move.w (a0)+,VDATA move.l a0,_SYS_HAPTR movem.l (a7)+,d0/a0 HIexit rte XDEF ExtInt *;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; * FUNCTION: ExtInt * DESCRIPTION: . * RETURNS: . * PARAMETERS: . * SIDE EFFECTS: USES * REVISIONS: 10/91 -jf- *;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ExtInt: rte * Interrupt numbers. These numbers are also defined in the standard * header file <signal.h>. Any modifications to these numbers *MUST* * be accompanied by identical modifications to those #defines. SIGBUS EQU 2 ; Bus error. SIGCHK EQU 3 ; chk instruction exception. SIGILL EQU 5 ; Illegal instruction. SIGOFLOW EQU 7 ; Overflow (trapv instruction). SIGPRIV EQU 8 ; Privilege violation. SIGSEGV EQU 9 ; Address error. SIGUIV EQU 11 ; Uninitialized exception vector. SIGZDIV EQU 12 ; Divide by zero. XREF __xraise Buserr: movem.l d0-d7/a0-a7,-(sp) ; SIGBUS move.l #SIGBUS,d0 ; Set signal #. bra.s L1 Addrerr: movem.l d0-d7/a0-a7,-(sp) ; SIGSEGV move.l #SIGSEGV,d0 ; Set signal #. bra.s L1 Ilglinst: movem.l d0-d7/a0-a7,-(sp) ; SIGILL move.l #SIGILL,d0 ; Set signal #. bra.s L1 Zdivide: movem.l d0-d7/a0-a7,-(sp) ; SIGZDIV move.l #SIGZDIV,d0 ; Set signal #. bra.s L1 Chkreg: movem.l d0-d7/a0-a7,-(sp) ; SIGCHK move.l #SIGCHK,d0 ; Set signal #. bra.s L1 Overflow: movem.l d0-d7/a0-a7,-(sp) ; SIGOFLOW move.l #SIGOFLOW,d0 ; Set signal #. bra.s L1 Privviol: movem.l d0-d7/a0-a7,-(sp) ; SIGPRIV move.l #SIGPRIV,d0 ; Set signal #. bra.s L1 Uninitv: movem.l d0-d7/a0-a7,-(sp) ; SIGUIV move.l #SIGUIV,d0 ; Set signal #. L1: move.l d0,-(sp) jsr __xraise ; Call signal interface function addq.w #4,sp movem.l (sp)+,d0-d7/a0-a7 rte |
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