Note Terminology Follow-up, Issue #595

- The SystemGuide.md file was omitted in the last commit.
- Corrected terminology in the comments of the sound drivers.

Source/Doc/SystemGuide.md

@@ -2277,15 +2277,15 @@ using values that correspond to musical notes.  The frequency will be
 applied when the next SNDPLAY function is invoked.  The returned Status 
 (A) is a standard HBIOS result code.
 
-The Note (HL) values correspond to quarter notes.  Increasing/decreasing
-the value by 4 results in a full note increment/decrement.  
+The Note (HL) values correspond to eighth notes.  Increasing/decreasing
+the value by 8 results in a full note increment/decrement.  
 Increasing/decreasing the value by 48 results in a full octave 
 increment/decrement.  The value 0 corresponds to Bb/A# in octave 0.
 
 The sound chip resolution and its oscillator limit the range and 
 accuracy of the notes played. The typical range of the AY-3-8910 is six 
 octaves: Bb2/A#2 to A7, where each value is a unique tone.  Values above
-and below can still be played but each quarter tone step may not result
+and below can still be played but each eighth tone step may not result
 in a note change.
 
 The following table shows the mapping of the Note (HL) value to the 

Source/HBIOS/ay38910.asm

@@ -556,10 +556,10 @@ AYT_REGWR		.DB	"\r\nOUT AY-3-8910 $"
 #ENDIF
 ;
 ;======================================================================
-;	QUARTER TONE FREQUENCY TABLE
+;	EIGHTH TONE FREQUENCY TABLE
 ;======================================================================
 ;
-; THE FOLLOWING TABLE MAPS A FULL OCTAVE OF QUARTER-NOTES
+; THE FOLLOWING TABLE MAPS A FULL OCTAVE OF EIGHTH-NOTES
 ; STARTING AT A# IN OCTAVE 0 TO THE CORRESPONDING PERIOD
 ; VALUE TO USE ON THE PSG TO ACHIEVE THE DESIRED NOTE FREQUENCY.
 ;

Source/HBIOS/sn76489.asm

@@ -452,10 +452,10 @@ SNT_REGWR		.DB	"\r\nOUT SN76489, $"
 #ENDIF
 ;
 ;======================================================================
-;	QUARTER TONE FREQUENCY TABLE
+;	EIGHTH TONE FREQUENCY TABLE
 ;======================================================================
 ;
-; THE FOLLOWING TABLE MAPS A FULL OCTAVE OF QUARTER-NOTES
+; THE FOLLOWING TABLE MAPS A FULL OCTAVE OF EIGHTH-NOTES
 ; STARTING AT A# IN OCTAVE 0 TO THE CORRESPONDING PERIOD
 ; VALUE TO USE ON THE PSG TO ACHIEVE THE DESIRED NOTE FREQUENCY.
 ;

Source/HBIOS/spk.asm

@@ -6,7 +6,7 @@
 ;======================================================================
 ;
 ;	LIMITATIONS -	CPU FREQUENCY ADJUSTMENT LIMITED TO 1MHZ RESOLUTION
-;			QUARTER TONES NOT SUPPORTED
+;			EIGHTH TONES NOT SUPPORTED
 ;			DURATION FIXED TO 1 SECOND.
 ;			NO VOLUME ADJUSTMENT DUE TO HARDWARE LIMITATION
 ;======================================================================
@@ -118,7 +118,7 @@ SP_NOTE:
 	AND	00000011B		; TO THE ASSOCIATED ENTRY
 	JR	Z,SP_NOTE1		; IN THE TUNE TABLE.
 ;
-	LD	HL,$FFFF		; QUARTER NOTES
+	LD	HL,$FFFF		; EIGHTH NOTES
 	JR	SP_NOTE2		; NOT SUPPORTED
 ;
 SP_NOTE1: