DOS下演奏音乐，初学Dos时另人十分心奋的东西

//DOS下演奏音乐，初学Dos时另人十分心奋的东西

code segment
assume cs:code
D1=131
D2=147
D3=165
D4=175
D5=196
D6=220
D7=247
Z1=262
Z2=294
Z3=330
Z4=349
Z5=392
Z6=440
Z7=494
G1=523
G2=587
G3=659
G4=714
G5=784
G6=880
G7=988
oldint8 dd ?
oldint9 dd ?
time    dw 0
ascii   DB 10H,11H,12H,13H,14H,15H,16H
        DB 1EH,1FH,20H,21H,22H,23H,24H
        DB 2CH,2DH,2EH,2FH,30H,31H,32H
music   dw d1,d2,d3,d4,d5,d6,d7
        dw z1,z2,z3,z4,z5,z6,z7
        dw g1,g2,g3,g4,g5,g6,g7
newint8: dec  cs:word ptr time
         jz closev
 new8_0: jmp cs:oldint8
 closev: push ax
         in al,61h
       &nb