diff --git a/Doc/ChangeLog.txt b/Doc/ChangeLog.txt
index 060105f6..2b72545a 100644
--- a/Doc/ChangeLog.txt
+++ b/Doc/ChangeLog.txt
@@ -2,6 +2,7 @@ Version 3.1.1
 -------------
 - WBW: Version bumped due to pervasive changes
 - WBW: Preliminary hard disk partition support (backward compatible)
+- WBW: Change Propeller VGA signal timings to 60Hz refresh
 
 Version 3.1
 -----------
diff --git a/Source/Prop/Spin/ParPortProp.spin b/Source/Prop/Spin/ParPortProp.spin
index 6ecf049f..5e890c21 100644
--- a/Source/Prop/Spin/ParPortProp.spin
+++ b/Source/Prop/Spin/ParPortProp.spin
@@ -3,8 +3,8 @@
   ************************************
   *  ParPortProp for RomWBW          *
   *  Interface to RBC ParPortProp    *
-  *  Version 0.96                 *
-  *  March 11, 2018               *
+  *  Version 0.97                    *
+  *  May 9, 2020                     *
   ************************************
 
   Wayne Warthen
@@ -29,11 +29,12 @@
   Updates:
 
     2018-03-11 WBW: Implement character attributes
+    2020-05-09 WBW: Switch monitor refresh to 60Hz
 
 }}
 
 CON
-  VERSION = (((0 << 8) + 96) << 16) + 0
+  VERSION = (((0 << 8) + 97) << 16) + 0
 
   _CLKMODE = XTAL1 + PLL16X
   _XINFREQ = 5_000_000
@@ -608,7 +609,7 @@ PRI Activity
 
 DAT
 
-strVer	byte	"F/W v0.96",0
+strVer	byte	"F/W v0.97",0
 strHW	byte	"ParPortProp",0
 strROM	byte	"RomWBW",0
 
diff --git a/Source/Prop/Spin/PropIO.spin b/Source/Prop/Spin/PropIO.spin
index 3d677264..9e074fe0 100644
--- a/Source/Prop/Spin/PropIO.spin
+++ b/Source/Prop/Spin/PropIO.spin
@@ -3,8 +3,8 @@
   *******************************
   *  PropIO for RomWBW          *
   *  Interface to RBC PropIO    *
-  *  Version 0.96               *
-  *  March 11, 2018             *
+  *  Version 0.97               *
+  *  May 9, 2020                *
   *******************************
 
   Wayne Warthen
@@ -34,11 +34,12 @@
     2014-02-09 WBW: Clean up
     2015-11-15 WBW: Added SD card capacity reporting
     2018-03-11 WBW: Implement character attributes
+    2020-05-09 WBW: Switch monitor refresh to 60Hz
 
 }}
 
 CON
-  VERSION = (((0 << 8) + 96) << 16) + 0
+  VERSION = (((0 << 8) + 97) << 16) + 0
 
   _CLKMODE = XTAL1 + PLL16X
   _XINFREQ = 5_000_000
@@ -337,7 +338,7 @@ PRI DumpBuffer(Buffer) | i, j
 
 DAT
 
-strVer	byte	"F/W v0.96",0
+strVer	byte	"F/W v0.97",0
 strHW	byte	"PropIO",0
 strROM	byte	"RomWBW",0
 
diff --git a/Source/Prop/Spin/PropIO2.spin b/Source/Prop/Spin/PropIO2.spin
index 9e01d3cb..ad1592f7 100644
--- a/Source/Prop/Spin/PropIO2.spin
+++ b/Source/Prop/Spin/PropIO2.spin
@@ -3,8 +3,8 @@
   *********************************
   *  PropIO 2 for RomWBW          *
   *  Interface to RBC PropIO 2    *
-  *  Version 0.96                 *
-  *  March 11, 2018               *
+  *  Version 0.97                 *
+  *  May 9, 2020                  *
   *********************************
 
   Wayne Warthen
@@ -34,11 +34,12 @@
     2014-02-08 WBW: Adaptation for PropIO 2
     2015-11-15 WBW: Added SD card capacity reporting
     2018-03-11 WBW: Implement character attributes
+    2020-05-09 WBW: Switch monitor refresh to 60Hz
 
 }}
 
 CON
-  VERSION = (((0 << 8) + 96) << 16) + 0
+  VERSION = (((0 << 8) + 97) << 16) + 0
 
   _CLKMODE = XTAL1 + PLL16X
   _XINFREQ = 5_000_000
@@ -337,7 +338,7 @@ PRI DumpBuffer(Buffer) | i, j
 
 DAT
 
-strVer	byte	"F/W v0.96",0
+strVer	byte	"F/W v0.97",0
 strHW	byte	"PropIO v2",0
 strROM	byte	"RomWBW",0
 
diff --git a/Source/Prop/Spin/vgacolour.spin b/Source/Prop/Spin/vgacolour.spin
index c5cc2f80..0981fe55 100644
--- a/Source/Prop/Spin/vgacolour.spin
+++ b/Source/Prop/Spin/vgacolour.spin
@@ -20,6 +20,7 @@
 
 CON
 
+{
 ' 640 x 480 @ 69Hz settings: 80 x 30 characters
 
 	hp = 640	' horizontal pixels
@@ -33,6 +34,24 @@ CON
 	hn = 1		' horizontal normal sync state (0|1)
 	vn = 1		' vertical normal sync state (0|1)
 	pr = 30		' pixel rate in MHz at 80MHz system clock (5MHz granularity)
+}
+	
+'{
+' 640 x 480 @ 60Hz settings: 80 x 40 characters
+
+  hp = 640      'horizontal pixels
+  vp = 480      'vertical pixels
+  hf = 16       'horizontal front porch pixels
+  hs = 96       'horizontal sync pixels
+  hb = 48      'horizontal back porch pixels
+  vf = 10        'vertical front porch lines
+  vs = 2        'vertical sync lines
+  vb = 33       'vertical back porch lines
+  hn = 1        'horizontal normal sync state (0|1)
+  vn = 1        'vertical normal sync state (0|1)
+  pr = 25       'pixel rate in MHz at 80MHz system clock (5MHz granularity)
+'}
+
 
 ' columns and rows
 
diff --git a/Source/ver.inc b/Source/ver.inc
index 783d72d7..59f55502 100644
--- a/Source/ver.inc
+++ b/Source/ver.inc
@@ -2,4 +2,4 @@
 #DEFINE	RMN	1
 #DEFINE	RUP	1
 #DEFINE	RTP	0
-#DEFINE BIOSVER	"3.1.1-pre.4"
+#DEFINE BIOSVER	"3.1.1-pre.5"
diff --git a/Source/ver.lib b/Source/ver.lib
index 450a4790..33acdafa 100644
--- a/Source/ver.lib
+++ b/Source/ver.lib
@@ -3,5 +3,5 @@ rmn	equ	1
 rup	equ	1
 rtp	equ	0
 biosver	macro
-	db	"3.1.1-pre.4"
+	db	"3.1.1-pre.5"
 	endm