diff --git a/Doc/RomWBW Applications.pdf b/Doc/RomWBW Applications.pdf
index 5c9c6468..03afb792 100644
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diff --git a/Doc/RomWBW Disk Catalog.pdf b/Doc/RomWBW Disk Catalog.pdf
index 67a36405..b00f00cd 100644
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diff --git a/Doc/RomWBW Hardware.pdf b/Doc/RomWBW Hardware.pdf
index 540c7e67..178d5da8 100644
Binary files a/Doc/RomWBW Hardware.pdf and b/Doc/RomWBW Hardware.pdf differ
diff --git a/Doc/RomWBW Introduction.pdf b/Doc/RomWBW Introduction.pdf
index f53feea1..f3746ef6 100644
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diff --git a/Doc/RomWBW System Guide.pdf b/Doc/RomWBW System Guide.pdf
index cf74fcd8..fcea0c85 100644
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diff --git a/Doc/RomWBW User Guide.pdf b/Doc/RomWBW User Guide.pdf
index 35212c21..c46f461f 100644
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diff --git a/Source/Doc/SystemGuide.md b/Source/Doc/SystemGuide.md
index 7b5862c3..67152ee1 100644
--- a/Source/Doc/SystemGuide.md
+++ b/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 
diff --git a/Source/HBIOS/ay38910.asm b/Source/HBIOS/ay38910.asm
index 3e5cfdf9..072c1176 100644
--- a/Source/HBIOS/ay38910.asm
+++ b/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.
 ;
diff --git a/Source/HBIOS/sn76489.asm b/Source/HBIOS/sn76489.asm
index c6e8c42c..64f5f30a 100644
--- a/Source/HBIOS/sn76489.asm
+++ b/Source/HBIOS/sn76489.asm
@@ -452,10 +452,10 @@ SNT_REGWR		.DB	"\r\nOUT SN76489, $"
 #ENDIF
 ;
 ;======================================================================
-;	QUARTER TONE FREQUENCY TABLE
+;	EIGHTH TONE FREQUENCY TABLE
 ;======================================================================
 ;
-; THE FOLLOWING TABLE MAPS A FULL OCTAVE OF QUARTER-NOTES
+; THE FOLLOWING TABLE MAPS A FULL OCTAVE OF EIGHTH-NOTES
 ; STARTING AT A# IN OCTAVE 0 TO THE CORRESPONDING PERIOD
 ; VALUE TO USE ON THE PSG TO ACHIEVE THE DESIRED NOTE FREQUENCY.
 ;
diff --git a/Source/HBIOS/spk.asm b/Source/HBIOS/spk.asm
index 55c9eb63..eecb7b9f 100644
--- a/Source/HBIOS/spk.asm
+++ b/Source/HBIOS/spk.asm
@@ -6,7 +6,7 @@
 ;======================================================================
 ;
 ;	LIMITATIONS -	CPU FREQUENCY ADJUSTMENT LIMITED TO 1MHZ RESOLUTION
-;			QUARTER TONES NOT SUPPORTED
+;			EIGHTH TONES NOT SUPPORTED
 ;			DURATION FIXED TO 1 SECOND.
 ;			NO VOLUME ADJUSTMENT DUE TO HARDWARE LIMITATION
 ;======================================================================
@@ -118,7 +118,7 @@ SP_NOTE:
 	AND	00000011B		; TO THE ASSOCIATED ENTRY
 	JR	Z,SP_NOTE1		; IN THE TUNE TABLE.
 ;
-	LD	HL,$FFFF		; QUARTER NOTES
+	LD	HL,$FFFF		; EIGHTH NOTES
 	JR	SP_NOTE2		; NOT SUPPORTED
 ;
 SP_NOTE1: