Bumble-Boogie – TI99/4A – TI Basic

Rivista: – Anno: – Numero: – Trascrizione: Ermanno Betori

Il Texas Instruments TI-99/4A nascondeva un chip sonoro dalle notevoli potenzialità per l’epoca: il TMS9919 (o SN94624), derivato dal famoso SN76489 della Texas Instruments stessa. Questo generatore di suoni programmabile offriva quattro canali distinti: tre canali per toni puri (square wave) e un canale dedicato al rumore (white noise), ciascuno con un controllo del volume a 16 livelli. Sebbene non disponesse di un canale d’onda campionata (PCM) per riprodurre voci o musica digitale, la sua architettura permetteva una polifonia chiara e precisa, ideale per melodie, effetti sonori arcade e basi ritmiche, ponendosi come avversario diretto del SID del Commodore 64 e del PSG dell’MSX.

I programmatori più abili riuscirono a spingere il chip oltre i suoi limiti apparenti, sfruttando tecniche avanzate come il “software mixing” e la modulazione di impulsi (PWM) per simulare timbri più complessi e persino una rudimentale sintesi del parlato, come nel programma “TI-Talk”. La vera sfida consisteva nel programmare il chip a basso livello, spesso ricorrendo al linguaggio Assembly per un controllo diretto e tempestivo dei registri, dato che il BASIC integrato non offriva comandi audio sofisticati. Questo sforzo di ottimizzazione era cruciale nei giochi, dove gli effetti sonori dovevano coesistere senza interferenze con l’azione sullo schermo.

Nonostante le limitazioni, anche il TI-BASIC offriva gli strumenti per creare suoni e musiche riconoscibili, aprendo la porta alla programmazione audio ai principianti. Il comando fondamentale era CALL SOUND, uno strumento potente ma che richiedeva pazienza e ingegno per essere sfruttato al meglio. Con una sola istruzione, si potevano controllare fino a tre dei quattro canali del chip sonoro, specificando per ciascuno la frequenza (in Hertz), il volume (da 0 a 30) e la durata (in decimi di secondo). La vera sfida consisteva nell’orchestrare questi parametri in loop e sequenze per costruire qualcosa di più di un semplice beep.

Esempio lampante questo Bumble-Boogie che vi presentiamo in questo articolo.

Titolo: Bumble-Boogie
Piattaforma: TI99/4A
Linguaggio: TI Basic
Versione originale: Jack Fina, Sam Moore
Pubblicazione: –
Anno: –
Trascrizione: Ermanno Betori
Anno: 2025
Download: N/A
Note: Usare il TI Basic.

Qui di seguito trovate il codice da copiare sul vostro TI99/4A oppure su un emulatore, noi suggeriamo Classic99.

Di seguito le istruzioni per caricare il listato sull’emulatore Classic99:
– Copiare il listato di cui sotto
– Avviare l’emulatore
– Da Cartridge -> Apps, selezionare Extended Basic
– Premere un tasto qualsiasi
– Dopodiché premere 1 per avviare il TI Basic
– Dal comando Edit, selezionare Paste XB per incollare il listato
– Digitare RUN per eseguire il codice
Buon divertimento!

Attenzione – Ci siamo resi conto che nel listato i caratteri ‘>’ e ‘<‘ potrebbero venir sostituiti dai rispettivi encoding html ‘&gt’ e ‘&lt’. Nel caso, sostituite questi valori nel listato prima di copiarlo sull’emulatore.

Listato: Bumble-Boogie – TI99/4A – TI Basic

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5 CALL CLEAR

10 CALL SCREEN(11)

30 PRINT "        BUMBLE-BOOGIE": :"      BASE BY JACK FINA": :

35 PRINT : : : : : : : : :

40 PRINT " JAZZED UP BY SAM MOORE JR.": : : : : : :

45 CALL CHAR(136,"00010307FF030102")

50 CALL CHAR(137,"5455555555555554")

52 CALL CHAR(134,"000E314080700C03")

54 CALL CHAR(135,"3048844424120A86")

55 CALL CHAR(138,"060F5F5F5E00008")

60 CALL CHAR(139,"0000F")

65 CALL CHAR(140,"0408")

70 CALL CHAR(141,"492")

71 R=10

72 CO=10

73 FOR N=1 TO 3

74 FOR M=1 TO 3

75 CALL HCHAR(R,CO,136)

77 CALL HCHAR(R-1,CO,134)

78 CALL HCHAR(R-1,CO+1,135)

80 CALL HCHAR(R,CO+1,137)

85 CALL HCHAR(R,CO+2,138)

90 CALL HCHAR(R,CO+3,139)

95 CALL HCHAR(R+1,CO,140)

100 CALL HCHAR(R+1,CO+2,141)

105 R=R+5

106 NEXT M

107 R=10

108 CO=CO+5

110 NEXT N

120 LLA=110

130 LLAS=117

140 LLBF=117

150 LLB=123

160 LC=131

170 LCS=139

180 LDF=139

190 LD=147

200 LDS=156

210 LEF=156

220 LE=165

230 LF=175

240 LFS=185

250 LGF=185

260 LG=196

270 LGS=208

280 LAF=208

290 LA=220

300 LAS=233

310 LBF=233

320 LB=247

330 C=262

340 CS=277

350 DF=277

360 D=294

370 DS=311

380 EF=311

390 E=330

400 F=349

410 FS=370

420 GF=370

430 G=392

440 GS=415

450 AF=415

460 A=440

470 AS=466

480 BF=466

490 B=494

500 HC=523

510 HCS=554

520 HDF=554

530 HD=587

540 HDS=622

550 HEF=622

560 HE=659

570 HF=698

580 HFS=740

590 HGF=740

600 HG=784

610 HGS=831

620 HAF=831

630 HA=880

640 HAS=932

650 HBF=932

660 HB=988

670 HHC=1047

680 HHCS=1109

690 HHDF=1109

700 HHD=1175

710 HHDS=1245

720 HHEF=1245

730 HHE=1319

740 HHF=1397

750 HHFS=1480

760 HHGF=1480

770 HHG=1568

780 HHGS=1661

790 HHAF=1661

800 HHA=1760

810 HHAS=1864

820 HHBF=1864

830 HHB=1976

840 HHHC=2094

850 T=-100

860 REM  1-4

870 FOR Z=1 TO 4

880 CALL SOUND(T,LLA,0,A,0)

890 CALL SOUND(T,LLA,0,LA,0)

900 CALL SOUND(T,LA,0,HA,0)

910 CALL SOUND(T,LA,0,A,0)

920 CALL SOUND(T,LC,0,HC,0)

930 CALL SOUND(T,LC,0,C,0)

940 CALL SOUND(T,LD,0,HD,0)

950 CALL SOUND(T,LD,0,D,0)

960 CALL SOUND(T,LDS,0,HDS,0)

970 CALL SOUND(T,LDS,0,DS,0)

980 CALL SOUND(T,LE,0,HE,0)

990 CALL SOUND(T,LE,0,E,0)

1000 CALL SOUND(T,LC,0,HC,0)

1010 CALL SOUND(T,LC,0,C,0)

1020 CALL SOUND(T,LE,0,HE,0)

1030 CALL SOUND(T,LE,0,E,0)

1040 NEXT Z

1050 REM  5-7

1060 FOR Z=1 TO 3

1070 CALL SOUND(T,HE,0,LLA,0)

1080 CALL SOUND(T,HEF,0,LLA,0)

1090 CALL SOUND(T,HD,0,LA,0)

1100 CALL SOUND(T,HDF,0,LA,0)

1110 CALL SOUND(T,HC,0,LC,0)

1120 CALL SOUND(T,HF,0,LC,0)

1130 CALL SOUND(T,HE,0,LD,0)

1140 CALL SOUND(T,HDS,0,LD,0)

1150 CALL SOUND(T,HE,0,LDS,0)

1160 CALL SOUND(T,HDS,0,LDS,0)

1170 CALL SOUND(T,HD,0,LE,0)

1180 CALL SOUND(T,HDF,0,LE,0)

1190 CALL SOUND(T,HC,0,LC,0)

1200 CALL SOUND(T,HDF,0,LC,0)

1210 CALL SOUND(T,HD,0,LE,0)

1220 CALL SOUND(T,HDS,0,LE,0)

1230 NEXT Z

1240 REM  8

1250 CALL SOUND(T,HE,0,LLA,0,A,0)

1260 CALL SOUND(T,LLA,0,LA,0)

1270 CALL SOUND(T,LA,0,HA,0)

1280 CALL SOUND(T,LA,0,A,0)

1290 CALL SOUND(T,LC,0,HC,0)

1300 CALL SOUND(T,LC,0,C,0)

1310 CALL SOUND(T,LD,0,HD,0)

1320 CALL SOUND(T,LD,0,D,0)

1330 CALL SOUND(T,LDS,0,HDS,0)

1340 CALL SOUND(T,LDS,0,DS,0)

1350 CALL SOUND(T,LE,0,HA,0)

1360 CALL SOUND(T,LE,0,A,0)

1370 CALL SOUND(T,LC,0,HA,0)

1380 CALL SOUND(T,LC,0,A,0)

1390 CALL SOUND(T,LE,0,HF,0)

1400 CALL SOUND(T,LE,0,F,0)

1410 REM  9-11

1420 FOR Z=1 TO 3

1430 CALL SOUND(T,HA,0,LD,0)

1440 CALL SOUND(T,HAF,0,LD,0)

1450 CALL SOUND(T,HG,0,D,0)

1460 CALL SOUND(T,HGF,0,D,0)

1470 CALL SOUND(T,HF,0,LF,0)

1480 CALL SOUND(T,HBF,0,LF,0)

1490 CALL SOUND(T,HA,0,LG,0)

1500 CALL SOUND(T,HGS,0,LG,0)

1510 CALL SOUND(T,HA,0,LGS,0)

1520 CALL SOUND(T,HGS,0,LGS,0)

1530 CALL SOUND(T,HG,0,LA,0)

1540 CALL SOUND(T,HGF,0,LA,0)

1550 CALL SOUND(T,HF,0,LLA,0)

1560 CALL SOUND(T,HGF,0,LLA,0)

1570 CALL SOUND(T,HG,0,LA,0)

1580 CALL SOUND(T,HGS,0,LA,0)

1590 NEXT Z

1600 REM  12

1610 CALL SOUND(T,HA,0,LD,0,HD,0)

1620 CALL SOUND(T,LD,0,D,0)

1630 CALL SOUND(T,D,0,HHD,0)

1640 CALL SOUND(T,D,0,HD,0)

1650 CALL SOUND(T,LF,0,HF,0)

1660 CALL SOUND(T,LF,0,F,0)

1670 CALL SOUND(T,LG,0,HG,0)

1680 CALL SOUND(T,LG,0,G,0)

1690 CALL SOUND(T,LGS,0,HGS,0)

1700 CALL SOUND(T,LGS,0,GS,0)

1710 CALL SOUND(T,LA,0,HD,0)

1720 CALL SOUND(T,LA,0,D,0)

1730 CALL SOUND(T,LLA,0,HF,0)

1740 CALL SOUND(T,LLA,0,F,0)

1750 CALL SOUND(T,LA,0,HA,0)

1760 CALL SOUND(T,LA,0,A,0)

1770 REM  13

1780 FOR Y=1 TO 2

1790 CALL SOUND(T,LE,0)

1800 CALL SOUND(T,LE,0,E,0)

1810 CALL SOUND(T,E,0,HD,0,HHE,0)

1820 CALL SOUND(T,E,0,HE,0)

1830 CALL SOUND(T,LE,0,HE,0)

1840 CALL SOUND(T,LE,0,E,0)

1850 CALL SOUND(T,E,0,HG,0)

1860 CALL SOUND(T,E,0,G,0)

1870 CALL SOUND(T,LE,0,HGS,0)

1880 CALL SOUND(T,LE,0,GS,0)

1890 CALL SOUND(T,E,0,HB,0)

1900 CALL SOUND(T,E,0,B,0)

1910 CALL SOUND(T,LE,0,HHCS,0)

1920 CALL SOUND(T,LE,0,HCS,0)

1930 CALL SOUND(T,E,0,HHE,0)

1940 CALL SOUND(T,E,0,HE,0)

1950 REM  14

1960 CALL SOUND(T,LF,0,HAF,0,HHF,0)

1970 CALL SOUND(T,LF,0,F,0)

1980 CALL SOUND(T,F,0,HF,0)

1990 CALL SOUND(T,HF,0,HHF,0)

2000 CALL SOUND(T,LF,0,F,0)

2010 CALL SOUND(T,F,0,HF,0)

2020 CALL SOUND(T,F,0,HAF,0,HHF,0)

2030 CALL SOUND(T,HF,0,HHF,0)

2040 CALL SOUND(T,LF,0,F,0)

2050 CALL SOUND(T,LF,0,F,0)

2060 CALL SOUND(T,F,0,HF,0)

2070 CALL SOUND(T,HF,0,HHF,0)

2080 CALL SOUND(T,LF,0,HAF,0,HHF,0)

2090 CALL SOUND(T,LF,0,F,0)

2100 CALL SOUND(T,F,0,HF,0)

2110 CALL SOUND(T,HF,0,HHF,0)

2120 NEXT Y

2130 REM  17

2140 FOR Y=1 TO 4

2150 CALL SOUND(T,LLA,0,HA,0)

2160 CALL SOUND(T,LLA,0,HBF,0)

2170 CALL SOUND(T,LA,0,HA,0)

2180 CALL SOUND(T,LA,0,HGS,0)

2190 NEXT Y

2200 REM  18

2210 CALL SOUND(T,LLA,0,HA,0)

2220 CALL SOUND(T,LLA,0,HAS,0)

2230 CALL SOUND(T,LA,0,HB,0)

2240 CALL SOUND(T,LA,0,HHC,0)

2250 CALL SOUND(T,LLA,0,HHCS,0)

2260 CALL SOUND(T,LLA,0,HHC,0)

2270 CALL SOUND(T,LA,0,HB,0)

2280 CALL SOUND(T,LA,0,HAS,0)

2290 CALL SOUND(T,LLA,0,HA,0)

2300 CALL SOUND(T,LLA,0,HAS,0)

2310 CALL SOUND(T,LA,0,HB,0)

2320 CALL SOUND(T,LA,0,HHC,0)

2330 CALL SOUND(T,LLA,0,HHCS,0)

2340 CALL SOUND(T,LLA,0,LA,0)

2350 CALL SOUND(T,LA,0,A,0)

2360 CALL SOUND(T,A,0,HA,0)

2370 REM  19

2380 FOR Y=1 TO 2

2390 CALL SOUND(T,LD,0)

2400 CALL SOUND(T,LD,0,D,0)

2410 CALL SOUND(T,D,0,HC,0,HHD,0)

2420 CALL SOUND(T,D,0,HD,0)

2430 CALL SOUND(T,LD,0,HD,0)

2440 CALL SOUND(T,LD,0,D,0)

2450 CALL SOUND(T,D,0,HF,0)

2460 CALL SOUND(T,D,0,F,0)

2470 CALL SOUND(T,LD,0,HFS,0)

2480 CALL SOUND(T,LD,0,FS,0)

2490 CALL SOUND(T,D,0,HA,0)

2500 CALL SOUND(T,D,0,A,0)

2510 CALL SOUND(T,LD,0,HB,0)

2520 CALL SOUND(T,LD,0,B,0)

2530 CALL SOUND(T,D,0,HHD,0)

2540 CALL SOUND(T,D,0,HD,0)

2550 REM  20

2560 CALL SOUND(T,LEF,0,HDF,0,HHEF,0)

2570 CALL SOUND(T,LEF,0,EF,0)

2580 CALL SOUND(T,EF,0,HEF,0)

2590 CALL SOUND(T,HEF,0,HHEF,0)

2600 CALL SOUND(T,LEF,0,EF,0)

2610 CALL SOUND(T,EF,0,HEF,0)

2620 CALL SOUND(T,EF,0,HDF,0,HHEF,0)

2630 CALL SOUND(T,HEF,0,HHEF,0)

2640 CALL SOUND(T,LEF,0,EF,0)

2650 CALL SOUND(T,LEF,0,EF,0)

2660 CALL SOUND(T,EF,0,HEF,0)

2670 CALL SOUND(T,HEF,0,HHEF,0)

2680 CALL SOUND(T,LEF,0,HDF,0,HHEF,0)

2690 CALL SOUND(T,LEF,0,EF,0)

2700 CALL SOUND(T,EF,0,HEF,0)

2710 CALL SOUND(T,HEF,0,HHEF,0)

2720 NEXT Y

2730 REM  23

2740 FOR Y=1 TO 4

2750 CALL SOUND(T,LD,0,HHD,0)

2760 CALL SOUND(T,LD,0,HHEF,0)

2770 CALL SOUND(T,D,0,HHD,0)

2780 CALL SOUND(T,D,0,HHCS,0)

2790 NEXT Y

2800 REM  24

2810 CALL SOUND(T,LD,0,HHD,0)

2820 CALL SOUND(T,LD,0,HHDS,0)

2830 CALL SOUND(T,D,0,HHE,0)

2840 CALL SOUND(T,D,0,HHF,0)

2850 CALL SOUND(T,LD,0,HHFS,0)

2860 CALL SOUND(T,LD,0,HHF,0)

2870 CALL SOUND(T,D,0,HHE,0)

2880 CALL SOUND(T,D,0,HHDS,0)

2890 CALL SOUND(T,LD,0,HHD,0)

2900 CALL SOUND(T,LD,0,HHDS,0)

2910 CALL SOUND(T,D,0,HHE,0)

2920 CALL SOUND(T,D,0,HHF,0)

2930 CALL SOUND(T,LD,0,HHFS,0)

2940 CALL SOUND(T,LD,0,D,0)

2950 CALL SOUND(T,D,0,HD,0)

2960 CALL SOUND(T,HD,0,HHD,0)

2970 REM  25

2980 CALL SOUND(T,LG,0,HHD,0)

2990 CALL SOUND(T,LG,0,HHDF,0)

3000 CALL SOUND(T,G,0,HHC,0)

3010 CALL SOUND(T,G,0,HB,0)

3020 CALL SOUND(T,LG,0,HBF,0)

3030 CALL SOUND(T,LG,0,HHEF,0)

3040 CALL SOUND(T,G,0,HHD,0)

3050 CALL SOUND(T,G,0,HHCS,0)

3060 CALL SOUND(T,LG,0,HHD,0)

3070 CALL SOUND(T,LG,0,HHCS,0)

3080 CALL SOUND(T,G,0,HHC,0)

3090 CALL SOUND(T,G,0,HB,0)

3100 CALL SOUND(T,LG,0,HBF,0)

3110 CALL SOUND(T,LG,0,HB,0)

3120 CALL SOUND(T,G,0,HHC,0)

3130 CALL SOUND(T,G,0,HHCS,0)

3140 REM  26

3150 CALL SOUND(T,LG,0,HHD,0)

3160 CALL SOUND(T,LG,0,HHDF,0)

3170 CALL SOUND(T,G,0,HHC,0)

3180 CALL SOUND(T,G,0,HB,0)

3190 CALL SOUND(T,LG,0,HHC,0)

3200 CALL SOUND(T,LG,0,HB,0)

3210 CALL SOUND(T,G,0,HBF,0)

3220 CALL SOUND(T,G,0,HA,0)

3230 CALL SOUND(T,LG,0,HBF,0)

3240 CALL SOUND(T,LG,0,HB,0)

3250 CALL SOUND(T,G,0,HHC,0)

3260 CALL SOUND(T,G,0,HHCS,0)

3270 CALL SOUND(T,LG,0,HHD,0)

3280 CALL SOUND(T,LG,0,HHEF,0)

3290 CALL SOUND(T,G,0,HHE,0)

3300 CALL SOUND(T,G,0,HHF,0)

3310 REM  27

3320 CALL SOUND(T,LE,0,HHE,0)

3330 CALL SOUND(T,LE,0,HHEF,0)

3340 CALL SOUND(T,E,0,HHD,0)

3350 CALL SOUND(T,E,0,HHCS,0)

3360 CALL SOUND(T,LE,0,HHD,0)

3370 CALL SOUND(T,LE,0,HHCS,0)

3380 CALL SOUND(T,E,0,HHC,0)

3390 CALL SOUND(T,E,0,HB,0)

3400 CALL SOUND(T,LE,0,HHC,0)

3410 CALL SOUND(T,LE,0,HB,0)

3420 CALL SOUND(T,E,0,HBF,0)

3430 CALL SOUND(T,E,0,HA,0)

3440 CALL SOUND(T,LE,0,HGS,0)

3450 CALL SOUND(T,LE,0,HG,0)

3460 CALL SOUND(T,E,0,HFS,0)

3470 CALL SOUND(T,E,0,HF,0)

3480 REM  28

3490 FOR Y=1 TO 8

3500 CALL SOUND(T,LE,0,HE,0)

3510 CALL SOUND(T,LE,0,HF,0)

3520 CALL SOUND(T,E,0,HE,0)

3530 CALL SOUND(T,E,0,HDS,0)

3540 NEXT Y

3550 REM  34

3560 CALL SOUND(T,LE,0,HE,0,HHE,0)

3570 CALL SOUND(T,LE,0,E,0,HE,0)

3810 CALL SOUND(T,HE,0,HHE,0,LE,0)

3820 CALL SOUND(T,HE,0,E,0,LE,0)

3830 CALL SOUND(T,HDS,0,HHDS,0,LDS,0)

3840 CALL SOUND(T,HDS,0,DS,0,LDS,0)

3850 CALL SOUND(T,HE,0,HHE,0,LD,0)

3860 CALL SOUND(T,HE,0,E,0,LD,0)

3870 CALL SOUND(T,HF,0,HHF,0,LDF,0)

3880 CALL SOUND(T,F,0,HF,0,LDF,0)

3890 CALL SOUND(T,HFS,0,HHFS,0,LC,0)

3900 CALL SOUND(T,FS,0,HFS,0,LC,0)

3910 CALL SOUND(T,HG,0,HHG,0,LLB,0)

3920 CALL SOUND(T,G,0,HG,0,LLB,0)

3930 CALL SOUND(T,HGS,0,HHGS,0,LLBF,0)

3940 CALL SOUND(T,GS,0,HGS,0,LLBF,0)

3950 REM  35

3960 CALL SOUND(T,HA,0,HHA,0,LLA,0)

3970 CALL SOUND(T,LLA,0,LA,0)

3980 CALL SOUND(T,LA,0,HA,0)

3990 CALL SOUND(T,LA,0,A,0)

4000 CALL SOUND(T,LC,0,HC,0)

4010 CALL SOUND(T,LC,0,C,0)

4020 CALL SOUND(T,LD,0,HD,0)

4030 CALL SOUND(T,LD,0,D,0)

4040 CALL SOUND(T,LDS,0,HDS,0)

4050 CALL SOUND(T,LDS,0,DS,0)

4055 IF Z=6 THEN 4140

4060 CALL SOUND(T,LE,0,HE,0)

4070 CALL SOUND(T,LE,0,E,0)

4080 CALL SOUND(T,LC,0,HC,0)

4090 CALL SOUND(T,LC,0,C,0)

4100 CALL SOUND(T,LE,0,HE,0)

4110 CALL SOUND(T,LE,0,E,0)

4120 Z=6run

4130 GOTO 3950

4140 CALL SOUND(T,LE,0,HHE,0)

4150 CALL SOUND(T,LE,0,HE,0)

4160 CALL SOUND(T,LC,0,HHE,0)

4170 CALL SOUND(T,LC,0,HE,0)

4180 CALL SOUND(T,LE,0,HHC,0)

4190 CALL SOUND(T,LE,0,HC,0)

4200 GOTO 1050

19580 END