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commands, process, explosion, command, music, sound, ufo, start, bug, code, dac, samples, scripts, end, reaching, goal, space, plant, flying, background, missile, pass, point, coin, jump, congratulations, car, loop, nmi, timer, irq1, request, c_sweep_voice_register, c_sweep_voice_pair, c_register_samples, c_toggle_register, simple, call, stop, return, 01, 0f, 10, 13, 14, 15, 17, 18, 1f, vectors,
Text of the page (most frequently used words):
register (333), ay0 (328), voice (103), lda (79), set_volume_and_reset_decay (76), #command (71), value (71), for (63), coarse (57), ay1 (57), fine (56), the (53), sta (51), script (49), threetone (45), journal (44), code (43), and (41), ramuse (41), ldb (38), write (38), pointer (37), jsr (36), return (36), volume (36), sound (35), ldx (34), call (34), counter (30), txt (30), sequence (29), process (26), next (26), test (26), cas (26), beq (25), bit (25), off (24), seqv0 (24), stb (24), c_sweep_voice_register (24), sequencer (23), hardware (23), stop (23), get (23), all (22), timebetween (22), curseqptr (21), retister (21), numsteps (21), initfreq (21), deltafreq (21), set (20), decrement (20), nmi (19), rts (19), done (19), clr (19), yes (19), chip (19), stx (18), commands (18), inx (18), mixer (18), explosion (18), number (17), store (17), interrupts (17), dec (17), bne (16), turn (15), bpl (15), force (14), control (14), fragment (14), restore (13), from (13), cmpb (13), inc (13), new (13), music (13), mixer_and (13), with (12), start (12), hold (12), samples (12), jmp (12), bytes (12), sounds (11), tick (11), incb (11), 801 (11), continue (11), current (11), mixer_or (11), tone (10), cmpa (10), sample (10), anda (10), bmi (10), skip (10), bra (10), bits (10), lsra (10), port2 (10), vector (9), this (9), curmix1 (9), clear (9), address (9), delta (9), car (9), 165 (9), 110 (9), 221 (9), ora (8), out (8), andb (8), disable (8), curvoice (8), lines (8), ufo (8), 96550445103858 (8), 09916338582677 (8), 06867588932806 (8), sequencer0 (8), pdf (8), timer (7), curmix0 (7), bug (7), status (7), time (7), strmstatus (7), nmitick (7), fcde (7), again (7), jump (7), inca (7), series (7), read (7), 802 (7), 37168630338734 (7), 147 (7), 124 (7), 10_111_111 (6), pula (6), mode (6), not (6), port (6), scripts (6), fcdd (6), handle (6), cli (6), byte (6), rval (6), cpu (6), sei (6), port1 (6), each (6), 11_111_110 (6), missile (6), 96395502645504 (6), 56653674832963 (6), 196 (6), space (6), dac (6), soundcode (6), soundramuse (6), soundhardware (6), defender (6), irq2 (5), irq1 (5), reset (5), fcad (5), ram (5), above (5), lower (5), back (5), table (5), ptr801 (5), brdstatus (5), volume_decay_speed (5), point (5), original (5), count (5), fdef (5), used (5), i94 (5), i98 (5), cnt (5), fddc (5), main (5), save (5), ticks (5), active (5), loop (5), congratulations (5), f92d (5), coin (5), 00_000_001 (5), background (5), f59f (5), 93794014084506 (5), goal (5), abc (5), asm (5), vectors (4), psha (4), fc98 (4), now (4), ignore (4), played (4), tab (4), wait (4), lslb (4), enable (4), fed4 (4), end (4), reload (4), channel (4), type (4), always (4), never (4), bcs (4), even (4), fdd1 (4), c_register_samples (4), carry (4), bug1 (4), c_sweep_voice_pair (4), upper (4), memory (4), rti (4), pshb (4), second (4), fd53 (4), fd3a (4), sndcmd (4), rom (4), ptr802 (4), 11_111_000 (4), 00_000_111 (4), f5f4 (4), 117 (4), 104 (4), flying (4), plant (4), reaching (4), phoenixj (4), output (3), flag (3), pshx (3), seqptr1 (3), what (3), seqptr2 (3), tied (3), seqptr4 (3), use (3), already (3), running (3), seqptr3 (3), ff3c (3), deca (3), abx (3), offset (3), bytecnt801 (3), lastcmd (3), std (3), then (3), mask (3), tba (3), pair (3), word (3), envelope (3), shape (3), adda (3), tmpfreq (3), odd (3), c_toggle_register (3), fda5 (3), add (3), bcc (3), d000 (3), irq (3), decb (3), delay (3), during (3), into (3), request (3), less (3), than (3), fd0f (3), fd51 (3), fd20 (3), ddr1 (3), fcd8 (3), processing (3), 4000hz (3), same (3), dex (3), last (3), voices (3), pass (3), fc77 (3), fc6d (3), fc63 (3), fc59 (3), sndproctmr (3), nmitick2 (3), cursamp802 (3), cursamp801 (3), fbd1 (3), f946 (3), f879 (3), one (3), seconds (3), song (3), through (3), f6a2 (3), 25445492662473 (3), 73852996254682 (3), 248 (3), 57944444444445 (3), f4cd (3), sequencer1 (3), after (3), other (3), bank7 (3), bank3 (3), bank2 (3), bank1 (3), invaders (3), jpg (3), capture (2), swi (2), here (2), but (2), pulx (2), seq1cmdtype (2), processcommands18 (2), matter (2), seq2cmdtype (2), ff60 (2), seq4cmdtype (2), available (2), restart (2), higher (2), ff4d (2), ff4c (2), seq3cmdtype (2), cmdseq3 (2), samplers (2), times (2), f400 (2), remember (2), player (2), f424 (2), f444 (2), ff25 (2), ff02 (2), ff05 (2), processcommands01 (2), reinitialize (2), fee9 (2), over (2), processes (2), step (2), zero (2), fee1 (2), ldd (2), multi (2), run (2), until (2), single (2), increment (2), addb (2), complex (2), 0000 (2), feae (2), fe93 (2), fe8a (2), fe7d (2), fe74 (2), fe63 (2), fdf3 (2), fe5c (2), fded (2), fe44 (2), fe36 (2), fdf5 (2), fe26 (2), fdfe (2), fdde (2), simplecommands (2), simple (2), till (2), fda8 (2), fd5b (2), fdc4 (2), did (2), they (2), are (2), was (2), should (2), data (2), move (2), fd8c (2), fd96 (2), fd86 (2), r0rrr (2), check (2), low (2), only (2), ports (2), outputs (2), turned (2), bug3 (2), 0000_1011 (2), pulb (2), 0001_0101 (2), selected (2), fd40 (2), fd0c (2), fd29 (2), fcf3 (2), fcef (2), fd00 (2), fcf5 (2), fce1 (2), fcc3 (2), fca2 (2), irq_ack (2), play (2), clock (2), msm5205 (2), handler (2), runs (2), a0xx (2), 4000 (2), 250hz (2), countdown (2), decrease (2), fc8a (2), fc7a (2), fc87 (2), fc85 (2), fc48 (2), fc10 (2), fc3e (2), fc2f (2), fc20 (2), fc19 (2), fbff (2), fc11 (2), bytecnt802 (2), nothing (2), board (2), soundloop (2), fbbd (2), voldec12 (2), fbb1 (2), voldec11 (2), fba5 (2), voldec10 (2), fb99 (2), voldec02 (2), fb8d (2), voldec01 (2), fb81 (2), voldec00 (2), fb75 (2), fb63 (2), fb51 (2), fb3f (2), fb2a (2), configure (2), opening (2), passing (2), thus (2), 4ms (2), 6168 (2), f56c (2), f6f9 (2), f754 (2), f64b (2), 156 (2), 186 (2), f521 (2), f4fb (2), ending (2), gap (2), f000 (2), rocks (2), f004 (2), missiles (2), hitting (2), ground (2), plays (2), slots (2), very (2), info (2), blend (2), bedlam (2), code1 (2), ramuse1 (2), pyramid (2), bank6 (2), bank5 (2), bank4 (2), bank0 (2), after_25 (2), after_24 (2), after_23 (2), after_22 (2), after_21 (2), after_20 (2), after_19 (2), after_18 (2), after_17 (2), after_16 (2), after_15 (2), after_14 (2), after_13 (2), after_12 (2), after_11 (2), after_10 (2), after_9 (2), after_8 (2), after_7 (2), after_6 (2), after_5 (2), after_4 (2), after_3 (2), after_2 (2), after_1 (2), after_start (2), early (2), asteroids (2), scramble (2), may2025 (2), func (2), main2 (2), vectorrom (2), gfx2 (2), sprites (2), gfx1 (2), moon (2), patrol (2), theory (2), arcade (2), boot (2), 1loader (2), fff0, serial, fff2, overflow, fff4, fff6, input, fff8, interrupt, strobe, fffa, fffc, non, maskable, fffe, initialization, sets, pointless, ff85, ff87, doesn, really, anything, ff89, ff8a, ffaa, ffca, ffea, bug2, ff6f, ff70, ff71, initialize, ff74, ff77, ff78, ff79, ff7b, ff7d, ff80, ff83, 10_111_110, cmdseq1, ff64, ff66, ff68, ff6b, ff6e, cmdseq2, processcommands15, seqencer, ff4f, ff51, ff53, ff56, ff59, 10_110_110, ff5b, ff5d, them, ff5f, ff62, cmdseq4, processcommand14, ff31, ff33, ff34, ff36, ff38, ff3a, priority, ff3e, ff40, seqence, ff43, ff46, 10_001_001, ff48, orb, ff4a, exactly, processcommands10, fef0, fef2, fef4, fef6, fef7, fef9, fefb, fefd, ff00, counts, ff07, ff09, ff0a, specified, ff0c, ff0e, ff0f, ff10, ff13, ff14, ff15, wouldn, great, have, ff17, ff19, descriptor, ff1a, ff1c, ff1e, ff20, ff22, ff24, ff26, ff27, ff2a, ff2b, ff2d, ff2f, fee3, reinit, fee6, feeb, feed, processcommand0, fec6, fec8, feca, fecc, fece, fecf, fed0, fed1, fed3, consecutive, registers, pointed, leave, pointing, fed6, fed9, feda, fedc, fedf, fee0, means, fec3, fec5, mmll, feb6, feb8, feba, lsb, msb, febc, febe, fec0, fec2, following, parser, loaded, 0m0r_rrrr, threevoice, 0m1c_0000, threevoices, 0m1c_011o, ayc, 0m1c_10vv, 0m1c_11vv, fde7, fde9, fdeb, fdf2, fdf6, two, fdf7, repeat, fdf8, another, fdfa, fdfc, fdfd, fe00, fe01, valid, fe03, note, fe05, fe07, fe09, fe0b, fe0d, fe10, fe12, lsrd, divided, fe13, fe15, fe17, fe19, fe1a, fe1b, fe1e, fe21, fe23, fe29, fe2b, cycle, cont, fe2d, fe30, fe31, repeats, fe33, extra, fe34, suba, fe38, fe3a, fe3c, encoding, fe3e, fe40, fe42, fe45, fe47, fe4a, fe4b, fe4d, fe4f, actual, fe51, fe53, fe55, fe57, fe59, countreload, fe5e, fe60, fe64, fe66, becomes, fe67, fe69, fe6b, fe6d, fe6f, fe71, fe76, fe78, fe7a, fe7f, fe81, fe83, fe85, fe87, fe8c, fe8e, fe90, fe95, 1ccccccc, commandtype, seriescount, fe97, fe99, params, fe9b, fe9c, fe9e, fea0, fea1, fea3, fea4, fea6, parameters, fea7, fea9, feab, fead, feaf, feb1, feb3, feb4, alternate, writing, 101_r_rrrr, fdc8, fdca, lowest, fdcb, fdcd, fdcf, fdd3, fdd6, fdd7, fdd9, fddb, fde0, fde2, fde4, rrrrr, regular, intervals, 100_r_rrrr, fdb4, fdb6, fdb8, fdb9, fdbb, fdbd, fdc0, fdc1, fdc2, list, fdc3, fdc6, math, were, values, actually, written, good, thing, fd7e, fd81, fd82, fd84, underflow, fd88, fd8a, switch, fd8e, fd90, fd92, fd94, fd95, fd97, fd98, fd99, fd9b, fd9d, fd9e, fda0, fda2, fda4, fda7, counted, fdaa, fdac, fdae, fdb0, fdb2, function, 110_r_1rrr, fd6a, confusing, way, getting, rid, fd6c, fd6e, fd70, sign, shortly, fd71, fd73, adjust, fd75, fd77, fd78, decrementing, fd7a, fd7c, 110_r_0rrr, fd62, fd64, fd66, fd68, thanks, leo, bodnar, explaining, connected, general, most, triggers, writes, toggles, high, clears, accessing, 9xxx, fc8b, release, line, can, fire, fc8e, fc90, fc93, fc95, fc97, ffff, ddr, fc9b, fc9d, fc9f, fca0, fca4, fca5, fca6, fca8, initial, fcaa, fcac, fcb0, fcb2, fcb4, about, seqnecer, too, fcb6, fcb8, fcba, fcbc, fcbe, fcc0, fcc5, fcc7, fcc9, fccb, fccd, fccf, fcd1, fcd3, channels, fcd5, bypass, waiting, fcdb, fce2, fce3, 2nd, fce5, fce7, fce9, fceb, fced, 0000_1000, fcf1, fcf2, fcf7, fcf9, fcfb, fcfc, fcfe, fcff, fd02, fd04, fd06, fd08, 0001_0000, fd0a, fd0d, wrie, fd10, fd12, fd14, fd16, fd18, 0001_0100, fd1a, fd1c, fd1e, fd21, fd23, fd25, fd27, 0000_1010, clra, fd2a, fd2c, inputs, fd2e, fd30, fd32, clrb, fd33, fd35, fd36, fd38, fd39, fd3b, fd3e, 0000_1001, fd43, fd45, auto, fd47, fd49, fd4a, fd4c, fd4e, fd52, volue, fd54, reg, fd57, 0001_0001, fd59, fd5c, nibble, fd5e, greater, equal, fd60, sweep, volcnt02, volcnt01, volcnt00, volcnt12, volcnt11, volcnt10, irq1commandrequest, zzz0000, driven, requesting, wired, pull, fbd9, fbdb, fbde, fbe0, fbe3, fbe6, fbe8, why, fbe9, fbeb, fbec, fbee, fbf0, fbf1, fbf3, fbf5, fbf7, fbf9, fbfa, fbfb, fbfc, fbfd, fc01, fc02, fc04, fc06, fc08, fc0a, fc0b, fc0c, fc0d, fc0e, fc13, fc15, fc17, fc1b, fc1d, fc1f, fc22, supports, 24k, fc24, invalid, fc26, fc28, fc2a, fc2c, fc2d, fc31, fc33, fc35, fc37, fc39, fc3b, fc3c, zzzz0000, fc40, fc42, fc44, fc47, gets, counters, requested, fc4a, fc4c, made, fc4f, fc51, fc53, fc54, don, fc56, fc5b, fc5d, fc5e, fc60, fc65, fc67, fc68, fc6a, fc6f, fc71, fc72, fc74, 0006, fc7c, fc7e, fc7f, fc81, fc83, fc88, samp_2, samp_1, nmitimer, fb1b, fb1c, down, volumes, fb1f, fb21, fb23, program, fb26, fb28, processed, fb2b, fb2e, fb30, fb32, fb34, fb36, fb38, fb3b, fb3d, fb42, fb44, fb46, fb48, fb4a, fb4d, fb4f, fb54, fb56, fb58, fb5a, fb5c, fb5f, fb61, fb66, fb68, fb6a, fb6c, fb6e, fb71, fb73, fb77, fb79, taken, fb7c, fb7e, fb83, fb85, fb88, fb8a, fb8f, fb91, fb94, fb96, fb9b, fb9d, fba0, fba2, fba7, fba9, fbac, fbae, fbb3, fbb5, fbb8, fbba, fbbf, fbc0, fbc2, fbc3, fbc5, lsrb, sampler, fbc6, let, fbc8, fbca, finish, fbcc, fbce, fall, fbcf, fbd3, send, fbd6, top, fb00, fb01, lds, 00ff, stack, fb04, internal, fb07, tones, noise, fb09, fb0b, fb0e, 0001_0011, fb10, ouput, fb12, fb15, fb18, watchdog, f95f, f961, 11_000_111, f963, f965, f967, f969, f96b, f96d, f970, f973, f976, f978, f97b, f97e, f981, f984, 00_111_000, f986, f987, f9a7, f9c7, f9e7, fa07, fa27, fa47, fa67, fa87, faa7, fac7, fae7, carexplosion, f8ec, f8ee, f8f0, f8f2, f8f4, f8f6, f8f8, f8fb, f8fe, f901, f905, f909, f90d, f911, f914, f917, f91a, f91e, f922, f926, f92a, f92c, f931, f935, f939, f93d, f941, f945, f94a, f94e, f952, f956, f95a, f95e, f84d, f84f, f851, f853, f855, f857, f859, f85b, f85d, f85f, f861, f864, f867, f869, f86b, f86d, f86f, f871, f873, f876, f878, f87b, f87d, f87f, f881, f884, f887, f889, f88c, f88f, f891, f893, f895, f898, f89a, f89d, f89f, f8a1, f8a4, f8a6, f8a8, f8aa, f8ad, f8af, f8b2, f8b4, f8b7, f8b9, f8bb, f8bd, f8c0, f8c2, f8c4, f8c7, f8c9, f8cb, f8cd, f8cf, f8d2, f8d4, f8d6, f8d8, f8db, f8dd, f8df, f8e1, f8e4, f8e6, f8e8, f8eb, startmusic, f803, f805, f807, f809, 11_111_001, f80b, f80d, f80f, f814, f816, f818, f81d, f81f, f821, f826, f828, f82a, f82f, f831, f833, f838, f83a, f83c, f841, f843, f845, f84a, 00_000_110, f84c, f7f1, f7f3, f7f5, f7f7, f7f9, f7fb, f7fd, f800, f802, f7e1, f7e3, f7e5, f7e7, f7e9, f7eb, f7ee, f7f0, passpoint, f7b9, f7bb, f7bd, f7bf, f7c1, f7c3, numsamples, f7c6, f7de, f7e0, ufoexplosion, f7ab, f7ad, f7af, f7b1, f7b6, f7b8, divides, 4khz, lasts, 004, defined, fragments, has, delays, decimal, take, takes, 672, entire, once, f56e, f570, f572, f574, f576, 11_011_101, f578, f57b, f57e, f581, f584, f587, f58a, f58d, f590, f593, f596, f599, f59c, goto, f5a1, f5a3, f5a5, f5a8, f5ab, f5ad, f5b0, f5b3, f5b5, f5b7, f5b9, f5bc, f5bf, f5c1, f5c4, f5c6, f5c8, f5cb, f5ce, f5d0, f5d3, f5d5, f5d7, f5da, f5dd, f5df, f5e1, f5e4, f5e7, f5e9, f5eb, f5ed, f5f0, f5f3, f5f6, f5f8, f5fa, f5fd, f600, f602, f605, f608, f60a, f60c, f60e, f611, f614, f616, f619, f61b, f61d, f620, f623, f625, f628, f62a, f62c, f62f, f632, f634, f636, f639, f63b, f63d, f640, f642, f644, f647, f64a, f64d, f64f, f651, f654, f656, f659, f65c, f65e, f661, 100, f663, 101, f665, 102, f668, 103, f66a, f66d, 105, f670, 106, f672, 107, f675, 108, f677, 109, f679, f67b, 111, f67e, 112, f680, 113, f683, 114, f686, 115, f688, 116, f68b, f68d, 118, f68f, 119, f692, 120, f694, 121, f697, 122, f69a, 123, f69c, f69e, 125, f6a1, 126, 127, f6a4, 128, f6a6, 129, f6a8, 130, f6ab, 131, f6ae, 132, f6b0, 133, f6b3, 134, f6b6, 135, f6b8, 136, f6ba, 137, f6bc, 138, f6bf, 139, f6c2, 140, f6c4, 141, f6c7, 142, f6c9, 143, f6cb, 144, f6cd, 145, f6d0, 146, f6d3, f6d5, 148, f6d8, 149, f6da, 150, f6dc, 151, f6df, 152, f6e2, 153, f6e4, 154, f6e6, 155, f6e9, f6ec, 157, f6ee, 158, f6f0, 159, f6f2, 160, f6f5, 161, f6f8, 162, 163, f6fb, 164, f6fd, f6ff, 166, f702, 167, f705, 168, f707, 169, f70a, 170, f70d, 171, f70f, 172, f711, 173, f713, 174, f716, 175, f719, 176, f71b, 177, f71e, 178, f720, 179, f722, 180, f724, 181, f727, 182, f72a, 183, f72c, 184, f72f, 185, f731, f733, 187, f736, 188, f739, 189, f73b, 190, f73d, 191, f73f, 192, f742, 193, f744, 194, f746, 195, 66771708683473, f749, f74b, 197, f74d, 198, f750, 199, f753, 200, 201, f756, 202, f758, 203, f75a, 204, f75d, 205, f760, 206, f762, 207, f765, 208, f768, 209, f76a, 210, f76c, 211, f76e, 212, f771, 213, f774, 214, f776, 215, f779, 216, f77b, 217, f77d, 218, f780, 219, f783, 220, f785, f788, 222, f78a, 223, f78c, 224, f78e, 225, 43458333333334, f791, 226, f794, 227, f796, 228, f798, 229, f79a, 230, f79d, 231, f7a0, 232, f7a2, 233, f7a4, 234, f7a7, 235, f7aa, 246, backgroundmusic, f516, f518, f51a, f51c, f523, f528, f52d, f52f, f534, f539, f53b, f540, f545, f547, f54c, f551, f553, f558, f55d, f55f, f564, f569, ufoflying, f4f5, f4f7, f4f9, f4fe, f501, f504, f507, f50a, f50d, f510, f513, spaceplant, f4a8, f4aa, f4ac, f4ae, f4b0, f4b2, f4b4, f4b7, f4bb, f4bf, f4c3, f4c6, f4ca, f4cc, f4d1, f4d5, f4d9, f4dd, f4e1, f4e5, f4e9, f4ed, f4f1, f4f2, f4f4, reachinggoal, f464, f466, f468, f46a, f46c, f46e, f470, f474, f478, f47c, f480, f483, f485, f489, f48d, f491, f495, f499, f49d, f4a1, f4a5, f4a7, endmusic, sequencer2, f446, f448, f44a, f44c, sequencer3, f44e, f450, f452, f454, f456, f458, f45a, f45c, f45e, f460, f462, commandscripts, stream, first, f404, 400, shooting, f408, f40c, 3fc, right, f410, f414, f418, f41c, f420, reserved, effects, f428, f42c, f430, f434, f438, f43c, f440, bet, include, make, explosioncommands, interesting, effect, lasting, consumes, 4th, contains, that, 1024, 2048, 512, f020, f040
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15 97 be sta strmstatus be fc17 20 e6 bra fbff continue with bit 1 fc19 86 02 lda 02 set bit 1 fc1b 9a be ora strmstatus of fc1d 97 be sta strmstatus be fc1f 3b rti nmi out even nmi ticks fc20 96 c7 lda ptr801 801 pointer fc22 81 a0 cmpa a0 pointer less than a0xx hardware supports up to 24k rom fc24 25 09 bcs fc2f yes hold last value invalid pointer fc26 de c7 ldx ptr801 801 pointer fc28 a6 00 lda 00 x get value fc2a 97 c1 sta cursamp801 next value for 801 lower 4 bits fc2c 08 inx next sample fc2d df c7 stx ptr801 save pointer fc2f 96 c9 lda ptr802 802 pointer fc31 81 a0 cmpa a0 pointer less than a0xx fc33 25 09 bcs fc3e yes hold last value fc35 de c9 ldx ptr802 802 pointer fc37 a6 00 lda 00 x get value fc39 97 c2 sta cursamp802 next value for 802 fc3b 08 inx next sample fc3c df c9 stx ptr802 save pointer fc3e 96 bf lda nmitick2 on tick zzzz0000 fc40 84 0e anda 0e process ay sound fc42 26 cc bne fc10 fc44 7c 00 c0 inc sndproctmr fc47 3b rti nmi out the c0 flag gets set by the nmi handler at 4000 16 250hz if processing sequence scripts decrement counters on each voice sequence and lower the volume on the voices as requested fc48 96 c0 lda sndproctmr time for scripts fc4a 27 3e beq fc8a no skip fc4c 7a 00 c0 dec sndproctmr script pass made fc4f 96 80 lda seqv0 decrement 80 voice 0 sequence counter if active fc51 27 06 beq fc59 0 fc53 4c inca or ff fc54 27 03 beq fc59 don t decrement fc56 7a 00 80 dec seqv0 fc59 96 81 lda seqv0 decrement 81 voice 1 sequence counter if active fc5b 27 06 beq fc63 fc5d 4c inca fc5e 27 03 beq fc63 fc60 7a 00 81 dec seqv0 fc63 96 82 lda seqv0 decrement 82 voice 2 sequence counter if active fc65 27 06 beq fc6d fc67 4c inca fc68 27 03 beq fc6d fc6a 7a 00 82 dec seqv0 fc6d 96 83 lda seqv0 decrement 83 voice 3 sequence counter if active fc6f 27 06 beq fc77 fc71 4c inca fc72 27 03 beq fc77 fc74 7a 00 83 dec seqv0 fc77 ce 00 06 ldx 0006 6 voices fc7a a6 ad lda ad x countdown timer for volume decrease fc7c 27 09 beq fc87 not active skip fc7e 4a deca time to decrease volume fc7f 26 04 bne fc85 no skip fc81 6c a7 inc a7 x flag decrement volume for voice fc83 a6 b3 lda b3 x restore volume counter fc85 a7 ad sta ad x current counter fc87 09 dex all voices fc88 26 f0 bne fc7a no do all fc8a 39 rts done irq1 command request irq1commandrequest thanks to leo bodnar for explaining the sound command sequence the main cpu address d000 write is connected to the sound cpu s ay0 sound chip general i o the upper most bit triggers the irq on the sound cpu the main cpu writes the command to d000 and toggles the upper bit of d000 bit low then high the sound cpu clears the irq by accessing memory 9xxx irq1 fc8b b7 90 00 sta irq_ack release the irq line so it can fire again fc8e c6 0e ldb 0e read from fc90 bd fd 20 jsr fd20 i o port a on ay chip 0 fc93 84 1f anda 1f only lower 5 bits fc95 97 bc sta sndcmd store sound command fc97 3b rti fc98 ce ff ff ldx ffff set ddr fc9b df 00 stx ddr1 ports 1 and 2 outputs fc9d c6 4f ldb 4f 4f bytes fc9f 08 inx 0 fca0 86 00 lda 00 clear value fca2 a7 80 sta 80 x write byte to memory fca4 08 inx next in memory fca5 5a decb all bytes fca6 26 fa bne fca2 do all bytes fca8 86 13 lda 13 initial chip status fcaa 97 d8 sta brdstatus for return from command fcac 39 rts done disable all sounds fcad bd fc c3 jsr fcc3 all sounds on ay0 fcb0 86 bf lda bf 10_111_111 fcb2 97 bb sta curmix1 mixer all sounds turned off fcb4 c6 ff ldb ff ff bug3 bug3 what about seqnecer 3 it is tied to ay1 too fcb6 d7 82 stb seqv0 voice sequence 2 off fcb8 d7 b1 stb volcnt10 volume dec counter ay1 0 fcba d7 b2 stb volcnt11 volume dec counter ay1 1 fcbc d7 b3 stb volcnt12 volume dec counter ay1 2 fcbe c6 17 ldb 17 10_111_111 fcc0 7e fc de jmp fcde write value a to ay register b fcc3 86 bf lda bf 10_111_111 fcc5 97 ba sta curmix0 mixer all sounds turned off fcc7 c6 ff ldb ff ff fcc9 d7 80 stb seqv0 voice sequence 0 off fccb d7 81 stb seqv0 voice sequence 1 off fccd d7 ae stb volcnt00 volume dec counter ay0 0 fccf d7 af stb volcnt01 volume dec counter ay0 1 fcd1 d7 b0 stb volcnt02 volume dec counter ay0 2 fcd3 c6 07 ldb 07 10_111_111 all channels off fcd5 7e fc de jmp fcde write value a to ay register b and return write value a to ay register b no delay during write fcd8 7c 00 bd inc nmitick set nmi counter bypass waiting fcdb 20 04 bra fce1 continue with write write value a to ay register b turn off interrupts fcdd 0f sei disable interrupts write value a to ay register b fcde 7f 00 bd clr nmitick clear nmi counter fce1 37 pshb save b address fce2 36 psha and a value fce3 c1 10 cmpb 10 2nd chip fce5 2a 19 bpl fd00 yes go fce7 86 0d lda 0d 0000_1011 fce9 97 03 sta port2 control lines fceb d7 02 stb port1 address fced c6 08 ldb 08 0000_1000 fcef d7 03 stb port2 control lines fcf1 5c incb bit 0 on fcf2 32 pula value fcf3 97 02 sta port1 write value fcf5 96 bd lda nmitick wait fcf7 27 fc beq fcf5 for nmi counter fcf9 d7 03 stb port2 store control fcfb 5a decb clear bit 0 fcfc d7 03 stb port2 store control fcfe 33 pulb restore b fcff 39 rts done fd00 86 15 lda 15 0001_0101 fd02 97 03 sta port2 control lines fd04 c4 0f andb 0f address 0 15 fd06 d7 02 stb port1 store address fd08 c6 10 ldb 10 0001_0000 fd0a 20 e3 bra fcef write value fd0c 37 pshb chip already selected fd0d 20 e4 bra fcf3 wrie value to selected chip fd0f 37 pshb save b fd10 86 15 lda 15 0001_0101 fd12 97 03 sta port2 chip 2 control lines fd14 c4 0f andb 0f address 0 15 fd16 d7 02 stb port1 store address fd18 c6 14 ldb 14 0001_0100 fd1a 20 0d bra fd29 continue read read ay register b into a fd1c c1 10 cmpb 10 second chip fd1e 2a ef bpl fd0f yes go handle fd20 37 pshb save b fd21 86 0d lda 0d 0000_1011 fd23 97 03 sta port2 chip 1 control lines fd25 d7 02 stb port1 store address fd27 c6 0c ldb 0c 0000_1010 fd29 4f clra 0 fd2a 97 03 sta port2 control lines fd2c 97 00 sta ddr1 port 2 now inputs fd2e d7 03 stb port2 control lines fd30 96 02 lda port1 read from register fd32 5f clrb 0 fd33 d7 03 stb port2 control lines fd35 5a decb ff fd36 d7 00 stb ddr1 port 2 now outputs fd38 33 pulb restore b fd39 39 rts done decrement ay chip 0 volume register b fd3a 0f sei disable interrupts fd3b bd fd 20 jsr fd20 read from port fd3e c6 09 ldb 09 0000_1001 control fd40 7f 00 bd clr nmitick clear nmi counter fd43 84 1f anda 1f only 5 bits used in volume register fd45 81 10 cmpa 10 m bit set auto volume fd47 2a 08 bpl fd51 yes ignore this request fd49 4a deca decrement the volume fd4a 81 07 cmpa 07 less than 7 fd4c 2b 03 bmi fd51 yes low as we get ignore fd4e bd fd 0c jsr fd0c write the new volume value fd51 0e cli enable interrupts fd52 39 rts done decrement ay chip 1 volue register b fd53 0f sei disable interrupts fd54 bd fd 0f jsr fd0f read reg b a fd57 c6 11 ldb 11 0001_0001 control fd59 20 e5 bra fd40 continue with write volume value script command c0 ef 5 or 6 bytes fd5b 17 tba check lower fd5c 84 0f anda 0f nibble fd5e 81 08 cmpa 08 greater or equal to 8 fd60 2a 08 bpl c_sweep_voice_pair yes go sweep register pair c_sweep_voice_register c_sweep_voice_register add delta i98 to current value i94 and set register c0 ef 110_r_0rrr cnt i94 i98 rval fd62 a6 94 lda 94 x get current tone value fd64 ab 98 adda 98 x add delta fd66 a7 94 sta 94 x store current fd68 20 67 bra fdd1 write current to register b 0 6 and return 4 x c_sweep_voice_pair c_sweep_voice_pair bug in code this function is never used add delta delta to fine coarse pair r0rrr and r0rrr 1 c0 ef 110_r_1rrr cnt i94 i98 rval delta fd6a cb 38 addb 38 confusing way of getting rid of bit 3 in register value fd6c de cd ldx curseqptr script pointer fd6e a6 05 lda 05 x delta value from script fd70 36 psha hold delta sign check shortly fd71 de d1 ldx curvoice voice number fd73 ab 94 adda 94 x adjust fd75 a7 94 sta 94 x fine tone value fd77 32 pula original delta fd78 2b 0c bmi fd86 handle decrementing fd7a 24 02 bcc bug1 no carry fd7c 6c 98 inc 98 x increment coarse tone bug 1 bug1 bug in code we did the math above on 94 and 98 as if they were fine coarse but we write the values as if they are coarse fine actually the fine value in 94 is never written to the fine register the delta value is always the fine value good thing this command was never used fd7e bd fc dd jsr fcdd write fine value to register b fd81 5c incb to coarse register fd82 a6 94 lda 94 x coarse value should be 98 fd84 20 4b bra fdd1 write coarse value to register b and return 4 x fd86 25 f6 bcs bug1 yes carry we should get a carry until underflow fd88 6a 98 dec 98 x decrement coarse value fd8a 20 f2 bra bug1 do it skip over data of current series command and switch to command 0 fd8c 6f 8c clr 8c x script command 0 fd8e de cd ldx curseqptr get the current sequence pointer fd90 c1 a0 cmpb a0 fd92 2b 02 bmi fd96 fd94 08 inx if b a0 x x 2 fd95 08 inx fd96 08 inx x x 3 fd97 08 inx fd98 08 inx fd99 c1 c0 cmpb c0 fd9b 2b 08 bmi fda5 if b c0 a 0f 8 x x 1 fd9d 17 tba fd9e 84 0f anda 0f fda0 81 08 cmpa 08 fda2 2b 01 bmi fda5 fda4 08 inx fda5 86 01 lda 01 process again on next sequencer tick fda7 39 rts done counted series commands fda8 df cd stx curseqptr hold the pointer fdaa de d1 ldx curvoice get the voice number fdac 6a 90 dec 90 x all done with this type of command fdae 27 dc beq fd8c yes move to next fdb0 c1 a0 cmpb a0 go if fdb2 2a 10 bpl fdc4 a0 or above c_register_samples c_register_samples set the value of rrrrr to si at regular intervals cnt is the number of samples always return rval 80 9f 100_r_rrrr cnt rval s0 s1 s2 sn fdb4 c4 1f andb 1f mask off register number fdb6 a6 94 lda 94 x get return value time till next process fdb8 36 psha hold return fdb9 de cd ldx curseqptr get back the pointer fdbb a6 03 lda 03 x get value to write fdbd bd fc dd jsr fcdd write value a to ay register b turn off interrupts fdc0 0e cli interrupts back on fdc1 32 pula restore a fdc2 08 inx next in sample list fdc3 39 rts out fdc4 c1 c0 cmpb c0 go if fdc6 2a 93 bpl fd5b c0 or above c_toggle_register c_toggle_register never used alternate writing i94 and i98 always return rval a0 bf 101_r_rrrr cnt i94 i98 rval fdc8 a6 90 lda 90 x current count of commands fdca 44 lsra lowest bit fdcb a6 94 lda 94 x value fdcd 25 02 bcs fdd1 odd use value from 94 fdcf a6 98 lda 98 x even use value from 98 fdd1 c4 1f andb 1f mask off register number fdd3 bd fc dd jsr fcdd write value a to ay register b turn off interrupts fdd6 0e cli enable interrupts fdd7 de cd ldx curseqptr restore x fdd9 a6 04 lda 04 x return value count to next process fddb 39 rts out process voice sequence x script pointer b is process type return x new script pointer a count till next process fddc 26 ca bne fda8 not script command zero fdde df cd stx curseqptr store new sequence pointer fde0 e6 00 ldb 00 x register number fde2 2a 03 bpl simplecommands go handle fde4 7e fe 93 jmp fe93 complex stop call return simple commands simplecommands for all following commands bit 6 is the multi bit if set the parser is run again and again until the bit is clear then the return value rv is loaded from the end of the sequence register 0m0r_rrrr vv rv store single register value register r vv threevoice 0m1c_0000 ff cc rv threevoices ff fine cc coarse mixer 0m1c_011o vv rv mixer and o 0 or or o 1 ayc with vv set_volume_and_reset_decay 0m1c_10vv nn rv set volume reload value and volume register to nn volume_decay_speed 0m1c_11vv nn rv set volume counter to reload value nn fde7 c4 3f andb 3f mask off the multi bit fde9 c1 20 cmpb 20 is it a single register command fdeb 2a 11 bpl fdfe no go handle 3 voice command fded a6 01 lda 01 x get value fdef bd fc dd jsr fcdd write value a to ay register b turn off interrupts fdf2 0e cli interrupts on fdf3 e6 00 ldb 00 x restore register value fdf5 08 inx skip fdf6 08 inx two byte command fdf7 58 lslb repeat bit set fdf8 2b e4 bmi fdde yes do another fdfa a6 00 lda 00 x get return value fdfc 08 inx point to next command fdfd 39 rts out fdfe c4 1f andb 1f register value 0 16 or mixer fe00 17 tba to a fe01 84 0f anda 0f is it a valid chip register 0 0 or 16 fe03 26 31 bne fe36 no mixer or volume 3 tone note fe05 a6 01 lda 01 x get the fine tone fe07 97 ce sta curseqptr 1 store it fe09 a6 02 lda 02 x get the coarse tone fe0b 97 cd sta curseqptr store it fe0d bd fe d4 jsr fed4 write channel a tone fe10 dc cd ldd curseqptr ce cd fe12 04 lsrd divided by fe13 dd cd std curseqptr 2 fe15 e6 00 ldb 00 x original fe17 c4 1f andb 1f register fe19 5c incb next fe1a 5c incb pair fe1b bd fe d4 jsr fed4 write channel b tone fe1e 7c 00 ce inc curseqptr 1 increment fe21 26 03 bne fe26 word in fe23 7c 00 cd inc curseqptr ce cd fe26 bd fe d4 jsr fed4 write channel c tone fe29 cb 07 addb 07 envelope shape register fe2b 86 09 lda 09 envelope shape cycle cont hold fe2d bd fc de jsr fcde write envelope shape fe30 0e cli interrupts on fe31 e6 00 ldb 00 x restore command for repeats fe33 08 inx skip extra byte fe34 20 bf bra fdf5 skip 2 bytes and done fe36 80 08 suba 08 8 fe38 2b 29 bmi fe63 yes go to mixer command volume control fe3a dd cf std tmpfreq hold n 1f and n 0f 8 fe3c 84 03 anda 03 complex encoding fe3e c1 30 cmpb 30 for fe40 2b 02 bmi fe44 sequencer fe42 8b 03 adda 03 number fe44 16 tab sequencer number to b fe45 a6 01 lda 01 x get value fe47 ce 00 00 ldx 0000 sequence number fe4a 3a abx to x fe4b d6 cf ldb tmpfreq original a remember already 8 fe4d c1 04 cmpb 04 set counter fe4f 2a 0b bpl fe5c yes go set counter reset volume dec counter and actual volume volume fe51 a6 b4 lda b4 x get counter reload for volume on voice fe53 a7 ae sta ae x reset volume dec counter fe55 de cd ldx curseqptr restore script pointer fe57 d6 d0 ldb tmpfreq 1 original b register fe59 7e fd ed jmp fded write from script to register and continue script set countreload for volume fe5c a7 b4 sta b4 x counter reload for volume dec on voice fe5e de cd ldx curseqptr restore script pointer fe60 7e fd f3 jmp fdf3 continue script mixer control and or or fe63 4c inca ff or bits in mixer value fe64 27 17 beq fe7d go or fe66 5c incb 6 becomes 7 mixer register fe67 c1 10 cmpb 10 ay1 chip fe69 2a 09 bpl fe74 yes go fe6b 96 ba lda curmix0 mixer value for ay0 fe6d a4 01 anda 01 x turn bits off fe6f 97 ba sta curmix0 new value fe71 7e fd ef jmp fdef write mixer and continue script fe74 96 bb lda curmix1 mixer value for ay1 fe76 a4 01 anda 01 x turn bits off fe78 97 bb sta curmix1 new value fe7a 7e fd ef jmp fdef write mixer and continue script fe7d c1 10 cmpb 10 ay1 chip fe7f 2a 09 bpl fe8a yes go fe81 96 ba lda curmix0 mixer value for ay0 fe83 aa 01 ora 01 x turn bits on fe85 97 ba sta curmix0 new value fe87 7e fd ef jmp fdef write mixer and continue script fe8a 96 bb lda curmix1 mixer value for ay1 fe8c aa 01 ora 01 x turn bits on fe8e 97 bb sta curmix1 new value fe90 7e fd ef jmp fdef write mixer and continue script fe93 c1 f0 cmpb f0 stop or call or return fe95 2a 17 bpl feae yes go handle start new series of commands 1ccccccc aa bb cc c commandtype aa 1 seriescount 94 x bb 98 x cc fe97 a6 01 lda 01 x get fe99 ee 02 ldx 02 x params for series fe9b 3c p...
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