Sound working at very low cpu frequencies

assembly/bios/libs/time.asm

@@ -0,0 +1,19 @@
+; Time library
+; @author Daniele Verducci
+
+; Duration (change these values based on CPU frequency)
+TIME_DUR_SECOND: EQU 255
+
+; Wait bc * 55 states
+; Use 1 iteration as delay between I/O bus writes
+; @param bc The number of iterations. Each iteration is 55 states long.
+Time_delay55:
+    bit     0,a    ; 8
+    bit     0,a    ; 8
+    bit     0,a    ; 8
+    and     a,255  ; 7
+    dec     bc      ; 6
+    ld      a,c     ; 4
+    or      a,b     ; 4
+    jp      nz,Time_delay55   ; 10, total = 55 states/iteration
+    ret