; Raster-Split-Hires - True 160 * 240 pixels ; only for PAL-VIC 20 ; Video-Ram Top: 4096-4351 = 240 double height chars ; Char-Ram Top: 4352-8191 = 3840 Byte = 30720 pixels(standard 160*192 res) ; Char-Ram Bottom1: 0-239 = 240 Byte = 1920 pixels ; Video-Ram Bottom: 240-299 = 60 double height chars ; Char-Ram Bottom2: 304-1023 = 720 Byte = 5760 pixels LINES = 312 CYCLES_PER_LINE = 71 TIMER_VALUE = 22150 ; LINES * CYCLES_PER_LINE - 2 *=$2667 begin ; SYS 15279 (initialize) jmp gron ; SYS 9831 jmp groff ; SYS 9834 jmp grclear ; SYS 9837 gron ; install IRQ and switch to graphics mode (create video-RAM charmap) charmap ldx #$10 loop1 txa sta $0ff0,x inx bne loop1 show lda #$0e sta $9000 lda #$19 sta $9001 lda #$14 sta $9002 lda #$1f sta $9003 start lda #$7f sta $912e ; disable and acknowledge interrupts sta $912d sta $911e ; disable NMIs (Restore key) ;synchronize with the screen sync ldx #$14 ; wait for this raster line (times 2) raster1 cpx $9004 bne raster1 ldy #9 bit $24 raster2 ldx $9004 txa bit $24 ldx #24 back dex bne back ; first spend some time (so that the whole cmp $9004 ; loop will be 2 raster lines) bcs forward ; save one cycle if $9004 changed too late forward dey bne raster2 ; now it is fully synchronized ; 6 cycles have passed since last $9004 change ; and we are on line 2*($71+9)=244 ; initialize the timers timers lda #$40 ; enable Timer A free run of both VIAs sta $912b lda #TIMER_VALUE sta $9126 stx $9125 ; start the IRQ timer A pointers lda #irq sta $315 lda #$c0 sta $912e ; enable Timer A underflow interrupts rts ; return groff sei jsr $fd52 ; Initialize I/O-Vectors jsr $fdf9 ; Initialize I/O-Register jsr $e518 ; Initialize Video-Controller cli rts grclear ; clear Area from $1100 to $23ff and color ram ldy #$12 ldx #$00 txa clear1 sta $1100,x inx bne clear1 inc clear1+2 dey bne clear1 ldx #$c0 clear11 sta $22ff,x dex bne clear11 lda #$11 sta clear1+2 ldy #$03 lda #$00 clear2 sta $9600,x inx bne clear2 dec clear2+2 dey bne clear2 lda #$96 sta clear2+2 rts irq ; Save relevant area from $0000-$03ff to $23c0-$2666(679 bytes) lda $0 sta $23C0 lda $1 sta $23C1 lda $2 sta $23C2 lda $3 sta $23C3 lda $4 sta $23C4 lda $5 sta $23C5 lda $6 sta $23C6 lda $7 sta $23C7 lda $8 sta $23C8 lda $9 sta $23C9 lda $A sta $23CA lda $B sta $23CB lda $C sta $23CC lda $D sta $23CD lda $E sta $23CE lda $F sta $23CF lda $10 sta $23D0 lda $11 sta $23D1 lda $12 sta $23D2 lda $13 sta $23D3 lda $14 sta $23D4 lda $15 sta $23D5 lda $16 sta $23D6 lda $17 sta $23D7 lda $18 sta $23D8 lda $19 sta $23D9 lda $1A sta $23DA lda $1B sta $23DB lda $1C sta $23DC lda $1D sta $23DD lda $1E sta $23DE lda $1F sta $23DF lda $20 sta $23E0 lda $21 sta $23E1 lda $22 sta $23E2 lda $23 sta $23E3 lda $24 sta $23E4 lda $25 sta $23E5 lda $26 sta $23E6 lda $27 sta $23E7 lda $28 sta $23E8 lda $29 sta $23E9 lda $2A sta $23EA lda $2B sta $23EB lda $2C sta $23EC lda $2D sta $23ED lda $2E sta $23EE lda $2F sta $23EF lda $30 sta $23F0 lda $31 sta $23F1 lda $32 sta $23F2 lda $33 sta $23F3 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sta $242B lda $6C sta $242C lda $6D sta $242D lda $6E sta $242E lda $6F sta $242F lda $70 sta $2430 lda $71 sta $2431 lda $72 sta $2432 lda $73 sta $2433 lda $74 sta $2434 lda $75 sta $2435 lda $76 sta $2436 lda $77 sta $2437 lda $78 sta $2438 lda $79 sta $2439 lda $7A sta $243A lda $7B sta $243B lda $7C sta $243C lda $7D sta $243D lda $7E sta $243E lda $7F sta $243F lda $80 sta $2440 lda $81 sta $2441 lda $82 sta $2442 lda $83 sta $2443 lda $84 sta $2444 lda $85 sta $2445 lda $86 sta $2446 lda $87 sta $2447 lda $88 sta $2448 lda $89 sta $2449 lda $8A sta $244A lda $8B sta $244B lda $8C sta $244C lda $8D sta $244D lda $8E sta $244E lda $8F sta $244F lda $90 sta $2450 lda $91 sta $2451 lda $97 sta $2452 lda $98 sta $2453 lda $99 sta $2454 lda $9A sta $2455 lda $9B sta $2456 lda $9C sta $2457 lda $9D sta $2458 lda $9E sta $2459 lda $9F sta $245A lda $A0 sta $245B lda $A1 sta $245C lda $A2 sta $245D lda $B2 sta $245E lda $B3 sta $245F lda $B4 sta $2460 lda $B5 sta $2461 lda $B6 sta $2462 lda $B7 sta $2463 lda $B8 sta $2464 lda $B9 sta $2465 lda $BA sta $2466 lda $BB sta $2467 lda $BC sta $2468 lda $BD sta $2469 lda $BE sta $246A lda $BF sta $246B lda $C0 sta $246C lda $C1 sta $246D lda $C2 sta $246E lda $C3 sta $246F lda $C4 sta $2470 lda $C5 sta $2471 lda $C6 sta $2472 lda $C7 sta $2473 lda $C8 sta $2474 lda $C9 sta $2475 lda $CA sta $2476 lda $CB sta $2477 lda $CC sta $2478 lda $CD sta $2479 lda $CE sta $247A lda $CF sta $247B lda $D0 sta $247C lda $D1 sta $247D lda $D2 sta $247E lda $D3 sta $247F lda $D4 sta $2480 lda $D5 sta $2481 lda $D6 sta $2482 lda $D7 sta $2483 lda $D8 sta $2484 lda $D9 sta $2485 lda $DA sta $2486 lda $DB sta $2487 lda $DC sta $2488 lda $DD sta $2489 lda $DE sta $248A lda $DF sta $248B lda $E0 sta $248C lda $E1 sta $248D lda $E2 sta $248E lda $E3 sta $248F lda $E4 sta $2490 lda $E5 sta $2491 lda $E6 sta $2492 lda $E7 sta $2493 lda $E8 sta $2494 lda $E9 sta $2495 lda $EA sta $2496 lda $EB sta $2497 lda $EC sta $2498 lda $ED sta $2499 lda $EE 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sta $24CF lda $12C sta $24D0 lda $12D sta $24D1 lda $12E sta $24D2 lda $12F sta $24D3 lda $130 sta $24D4 lda $131 sta $24D5 lda $132 sta $24D6 lda $133 sta $24D7 lda $134 sta $24D8 lda $135 sta $24D9 lda $136 sta $24DA lda $137 sta $24DB lda $138 sta $24DC lda $139 sta $24DD lda $13A sta $24DE lda $13B sta $24DF lda $13C sta $24E0 lda $13D sta $24E1 lda $13E sta $24E2 lda $13F sta $24E3 lda $140 sta $24E4 lda $141 sta $24E5 lda $142 sta $24E6 lda $143 sta $24E7 lda $144 sta $24E8 lda $145 sta $24E9 lda $146 sta $24EA lda $147 sta $24EB lda $148 sta $24EC lda $149 sta $24ED lda $14A sta $24EE lda $14B sta $24EF lda $14C sta $24F0 lda $14D sta $24F1 lda $14E sta $24F2 lda $14F sta $24F3 lda $150 sta $24F4 lda $151 sta $24F5 lda $152 sta $24F6 lda $153 sta $24F7 lda $154 sta $24F8 lda $155 sta $24F9 lda $156 sta $24FA lda $157 sta $24FB lda $158 sta $24FC lda $159 sta $24FD lda $15A sta $24FE lda $15B sta $24FF lda $15C sta $2500 lda $15D sta $2501 lda $15E sta $2502 lda $15F sta $2503 lda $160 sta $2504 lda $161 sta $2505 lda $162 sta $2506 lda $163 sta $2507 lda $164 sta $2508 lda $165 sta $2509 lda $166 sta $250A lda $167 sta $250B lda $168 sta $250C lda $169 sta $250D lda $16A sta $250E lda $16B sta $250F lda $16C sta $2510 lda $16D sta $2511 lda $16E sta $2512 lda $16F sta $2513 lda $170 sta $2514 lda $171 sta $2515 lda $172 sta $2516 lda $173 sta $2517 lda $174 sta $2518 lda $175 sta $2519 lda $176 sta $251A lda $177 sta $251B lda $178 sta $251C lda $179 sta $251D lda $17A sta $251E lda $17B sta $251F lda $17C sta $2520 lda $17D sta $2521 lda $17E sta $2522 lda $17F sta $2523 lda $180 sta $2524 lda $181 sta $2525 lda $182 sta $2526 lda $183 sta $2527 lda $184 sta $2528 lda $185 sta $2529 lda $186 sta $252A lda $187 sta $252B lda $188 sta $252C lda $189 sta $252D lda $18A sta $252E lda $18B sta $252F lda $18C sta $2530 lda $18D sta $2531 lda $18E sta $2532 lda $18F sta $2533 lda $190 sta $2534 lda $191 sta $2535 lda $192 sta $2536 lda $193 sta $2537 lda $194 sta 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$1C9 sta $256D lda $1CA sta $256E lda $1CB sta $256F lda $1CC sta $2570 lda $1CD sta $2571 lda $1CE sta $2572 lda $1CF sta $2573 lda $1D0 sta $2574 lda $1D1 sta $2575 lda $1D2 sta $2576 lda $1D3 sta $2577 lda $1D4 sta $2578 lda $1D5 sta $2579 lda $1D6 sta $257A lda $1D7 sta $257B lda $1D8 sta $257C lda $1D9 sta $257D lda $1DA sta $257E lda $1DB sta $257F lda $1DC sta $2580 lda $1DD sta $2581 lda $1DE sta $2582 lda $1DF sta $2583 lda $1E0 sta $2584 lda $1E1 sta $2585 lda $1E2 sta $2586 lda $1E3 sta $2587 lda $1E4 sta $2588 lda $1E5 sta $2589 lda $1E6 sta $258A lda $1E7 sta $258B lda $1E8 sta $258C lda $1E9 sta $258D lda $1EA sta $258E lda $1EB sta $258F lda $1EC sta $2590 lda $1ED sta $2591 lda $1EE sta $2592 lda $1EF sta $2593 lda $1F0 sta $2594 lda $1F1 sta $2595 lda $1F2 sta $2596 lda $1F3 sta $2597 lda $1F4 sta $2598 lda $1F5 sta $2599 lda $1F6 sta $259A lda $1F7 sta $259B lda $1F8 sta $259C lda $1F9 sta $259D lda $1FA sta $259E lda $1FB sta $259F lda $1FC sta $25A0 lda $1FD sta $25A1 lda $1FE sta $25A2 lda $1FF sta $25A3 lda $200 sta $25A4 lda $201 sta $25A5 lda $202 sta $25A6 lda $203 sta $25A7 lda $204 sta $25A8 lda $205 sta $25A9 lda $206 sta $25AA lda $207 sta $25AB lda $208 sta $25AC lda $209 sta $25AD lda $20A sta $25AE lda $20B sta $25AF lda $20C sta $25B0 lda $20D sta $25B1 lda $20E sta $25B2 lda $20F sta $25B3 lda $210 sta $25B4 lda $211 sta $25B5 lda $212 sta $25B6 lda $213 sta $25B7 lda $214 sta $25B8 lda $215 sta $25B9 lda $216 sta $25BA lda $217 sta $25BB lda $218 sta $25BC lda $219 sta $25BD lda $21A sta $25BE lda $21B sta $25BF lda $21C sta $25C0 lda $21D sta $25C1 lda $21E sta $25C2 lda $21F sta $25C3 lda $220 sta $25C4 lda $221 sta $25C5 lda $222 sta $25C6 lda $223 sta $25C7 lda $224 sta $25C8 lda $225 sta $25C9 lda $226 sta $25CA lda $227 sta $25CB lda $228 sta $25CC lda $229 sta $25CD lda $22A sta $25CE lda $22B sta $25CF lda $22C sta $25D0 lda $22D sta $25D1 lda $22E sta $25D2 lda $22F sta $25D3 lda $230 sta $25D4 lda $231 sta $25D5 lda 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$260A lda $267 sta $260B lda $268 sta $260C lda $269 sta $260D lda $26A sta $260E lda $26B sta $260F lda $26C sta $2610 lda $26D sta $2611 lda $26E sta $2612 lda $26F sta $2613 lda $270 sta $2614 lda $271 sta $2615 lda $272 sta $2616 lda $273 sta $2617 lda $274 sta $2618 lda $275 sta $2619 lda $276 sta $261A lda $277 sta $261B lda $278 sta $261C lda $279 sta $261D lda $27A sta $261E lda $27B sta $261F lda $27C sta $2620 lda $27D sta $2621 lda $27E sta $2622 lda $27F sta $2623 lda $280 sta $2624 lda $281 sta $2625 lda $282 sta $2626 lda $283 sta $2627 lda $284 sta $2628 lda $285 sta $2629 lda $286 sta $262A lda $287 sta $262B lda $288 sta $262C lda $289 sta $262D lda $28A sta $262E lda $28B sta $262F lda $28C sta $2630 lda $28D sta $2631 lda $28E sta $2632 lda $28F sta $2633 lda $290 sta $2634 lda $291 sta $2635 lda $292 sta $2636 lda $300 sta $2637 lda $301 sta $2638 lda $302 sta $2639 lda $303 sta $263A lda $304 sta $263B lda $305 sta $263C lda $306 sta $263D lda $307 sta $263E lda 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$23BB sta $3FB lda $23BC sta $3FC lda $23BD sta $3FD lda $23BE sta $3FE lda $23BF sta $3FF ; create Charmap for Video Ram from 240 to 299 charmap2 ldx #$00 stx $f0 inx stx $f1 inx stx $f2 inx stx $f3 inx stx $f4 inx stx $f5 inx stx $f6 inx stx $f7 inx stx $f8 inx stx $f9 inx stx $fa inx stx $fb inx stx $fc inx stx $fd inx stx $fe ldx #$13 stx $ff inx stx $100 inx stx $101 inx stx $102 inx stx $103 inx stx $104 inx stx $105 inx stx $106 inx stx $107 inx stx $108 inx stx $109 inx stx $10a inx stx $10b inx stx $10c inx stx $10d inx stx $10e inx stx $10f inx stx $110 inx stx $111 inx stx $112 inx stx $113 inx stx $114 inx stx $115 inx stx $116 inx stx $117 inx stx $118 inx stx $119 inx stx $11a inx stx $11b inx stx $11c inx stx $11d inx stx $11e inx stx $11f inx stx $120 inx stx $121 inx stx $122 inx stx $123 inx stx $124 inx stx $125 inx stx $126 inx stx $127 inx stx $128 inx stx $129 inx stx $12a inx stx $12b ; switch graphics to 3 extra lines below 192 ldy #$88 sty $9005 ldx #60 wait inx bne wait ; spend some time so copying back will only happen after char has been displayed ; restore relevant area from $23c0-$2666 to $0000-$03ff (make good use of raster time for extra display of 48 lines) lda $23C0 sta $0 lda $23C1 sta $1 lda $23C2 sta $2 lda $23C3 sta $3 lda $23C4 sta $4 lda $23C5 sta $5 lda $23C6 sta $6 lda $23C7 sta $7 lda $23C8 sta $8 lda $23C9 sta $9 lda $23CA sta $A lda $23CB sta $B lda $23CC sta $C lda $23CD sta $D lda $23CE sta $E lda $23CF sta $F lda $23D0 sta $10 lda $23D1 sta $11 lda $23D2 sta $12 lda $23D3 sta $13 lda $23D4 sta $14 lda $23D5 sta $15 lda $23D6 sta $16 lda $23D7 sta $17 lda $23D8 sta $18 lda $23D9 sta $19 lda $23DA sta $1A lda $23DB sta $1B lda $23DC sta $1C lda $23DD sta $1D lda $23DE sta $1E lda $23DF sta $1F lda $23E0 sta $20 lda $23E1 sta $21 lda $23E2 sta $22 lda $23E3 sta $23 lda $23E4 sta $24 lda $23E5 sta $25 lda $23E6 sta $26 lda $23E7 sta $27 lda $23E8 sta $28 lda $23E9 sta $29 lda $23EA sta $2A lda $23EB sta $2B lda $23EC sta 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$2665 sta $332 lda $2666 sta $333 jmp $eabf ; return to normal IRQ end brk