Fix boot failure with three sound devices

Source/HBIOS/hbios.asm

@@ -3695,7 +3695,7 @@ SND_ADDENT:
 ;	WORD	UNIT SPECIFIC DATA (TYPICALLY A DEVICE INSTANCE DATA ADDRESS)
 ;
 SND_FNCNT	.EQU	8		; NUMBER OF SND FUNCS (FOR RANGE CHECK)
-SND_MAX		.EQU	3		; UP TO 2 UNITS
+SND_MAX		.EQU	4		; UP TO 3 UNITS
 SND_SIZ		.EQU	SND_MAX * 4	; EACH ENTRY IS 4 BYTES
 ;
 		.DB	SND_FNCNT	; SND FUNCTION COUNT (FOR RANGE CHECK)
@@ -5230,7 +5230,7 @@ HB_ADDENT:
 ; ALL OTHER REGISTERS PRESERVED
 ;
 ; A 4 BYTE HEADER IS PLACED IN FRONT OF THE ALLOCATED MEMORY
-;  - DWORD: SIZE OF MEMROY ALLOCATED (DOES NOT INCLUDE 4 BYTE HEADER)
+;  - DWORD: SIZE OF MEMORY ALLOCATED (DOES NOT INCLUDE 4 BYTE HEADER)
 ;  - DWORD: ADDRESS WHERE ALLOC WAS CALLED (VALUE ON TOP OF STACK AT CALL)
 ;
 HB_ALLOC:

Source/HBIOS/sn76489.asm

@@ -43,6 +43,9 @@ SN7RATIO	.EQU	SN7CLK * 100 / 32
 
 SN76489_INIT:
 	LD	IY, SN7_IDAT		; POINTER TO INSTANCE DATA
+	LD	BC, SN7_FNTBL		; BC := FUNCTION TABLE ADDRESS
+	LD	DE, SN7_IDAT		; DE := SN7 INSTANCE DATA PTR
+	CALL	SND_ADDENT		; ADD ENTRY, A := UNIT ASSIGNED
 
 	LD	DE,STR_MESSAGELT
 	CALL	WRITESTR
@@ -53,11 +56,6 @@ SN76489_INIT:
 	CALL	WRITESTR
 	LD	A, SN76489_PORT_RIGHT
 	CALL	PRTHEXBYTE
-;
-SN7_INIT1:
-	LD	BC, SN7_FNTBL		; BC := FUNCTION TABLE ADDRESS
-	LD	DE, SN7_IDAT		; DE := SN7 INSTANCE DATA PTR
-	CALL	SND_ADDENT		; ADD ENTRY, A := UNIT ASSIGNED
 
 	CALL	SN7_VOLUME_OFF
 	XOR	A			; SIGNAL SUCCESS
@@ -67,7 +65,6 @@ SN7_INIT1:
 ; SN76489 DRIVER - SOUND ADAPTER (SND) FUNCTIONS
 ;======================================================================
 ;
-
 SN7_RESET:
 	AUDTRACE(SNT_INIT)
 	CALL	SN7_VOLUME_OFF