diff --git a/README.md b/README.md
index b7db6a2..2861a9d 100644
--- a/README.md
+++ b/README.md
@@ -10,10 +10,13 @@ Portable emulator of an Apple II+ or //e. Written in Go.
   - Apple ][+ with 48Kb of base RAM
   - Apple //e with 128Kb of RAM
   - Apple //e enhanced with 128Kb of RAM
-  - Base64A clone with 48Kb of base RAM and paginated ROM
+  - Base64A clone with 48Kb of base RAM and paged ROM
 - Storage
-  - 16 Sector 5 1/4 diskettes in NIB, DSK or PO format
-  - 16 Sector 5 1/4 diskettes in WOZ 1.0 or 2.0 format (read only)
+  - 16 Sector 5 1/4 diskettes. Uncompressed or compressed witth gzip or zip. Supported formats:
+    - NIB (read only)
+    - DSK
+    - PO
+    - WOZ 1.0 or 2.0 (read only)
   - 3.5 disks in PO or 2MG format
   - Hard disk in HDV or 2MG format with ProDOS and SmartPort support
 - Emulated extension cards:
@@ -61,7 +64,7 @@ Portable emulator of an Apple II+ or //e. Written in Go.
 By default the following configuration is launched:
 
 - Enhanced Apple //e with 65c02 processor
-- RAMworks card with 80 column, RGB (with Video7 modes) and 8Gb RAM is aux slot
+- RAMWorks card with 80 column, RGB (with Video7 modes) and 8Gb RAM in aux slot
 - Memory Expansion card with 1Gb in slot 1
 - VidHD card (SHR support) in slot 2
 - FASTChip Accelerator card in slot 3
@@ -177,6 +180,8 @@ Only valid on SDL mode
         shows the character map
   -fastChipSlot int
         slot for the FASTChip accelerator card, -1 for none (default 3)
+  -forceCaps
+        force all letters to be uppercased (no need for caps lock!)
   -fastDisk
         set fast mode when the disks are spinning (default true)
   -hd string
diff --git a/go.mod b/go.mod
index 4d2117a..c1a489e 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module github.com/ivanizag/izapple2
 go 1.12
 
 require (
-	fyne.io/fyne v1.4.0-rc1
+	fyne.io/fyne v1.4.0
 	github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200625191551-73d3c3675aa3
 	github.com/kr/text v0.2.0 // indirect
 	github.com/pkg/profile v1.5.0
diff --git a/go.sum b/go.sum
index 47ae5e7..39e6e9d 100644
--- a/go.sum
+++ b/go.sum
@@ -2,6 +2,8 @@ fyne.io/fyne v1.3.3 h1:jpdp9kTJ1ZOKQjyHZfzQGz/E3V35KVoMTawtii/1/j4=
 fyne.io/fyne v1.3.3/go.mod h1:osD/JXxGf8AC7aB+Ek0YuFF2QXzdTFFzMRM8cdqrwvQ=
 fyne.io/fyne v1.4.0-rc1 h1:s/WaHDiNJDBWVopfP69bEShUj1SJscg4GOaK1s3tKiU=
 fyne.io/fyne v1.4.0-rc1/go.mod h1:j6pz0cVZSgVo3VnVS4MSTOW7yjK1KW8erwBnUoWKgqI=
+fyne.io/fyne v1.4.0 h1:4fdy+SIVen+iKtBvpIegi4ox1f5IygtXhNJFS2aEucQ=
+fyne.io/fyne v1.4.0/go.mod h1:j6pz0cVZSgVo3VnVS4MSTOW7yjK1KW8erwBnUoWKgqI=
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/Kodeworks/golang-image-ico v0.0.0-20141118225523-73f0f4cfade9/go.mod h1:7uhhqiBaR4CpN0k9rMjOtjpcfGd6DG2m04zQxKnWQ0I=
diff --git a/screen/hiRes.go b/screen/hiRes.go
index 988026c..8f34c56 100644
--- a/screen/hiRes.go
+++ b/screen/hiRes.go
@@ -46,6 +46,8 @@ func renderHiRes(data []uint8, light color.Color) *image.RGBA {
 				}
 
 				if shifted {
+					// "The general rule of all these HIRES interference patterns is that delayed extends
+					// undelayed, and undelayed cuts off delayed"
 					img.Set(x, y, previousColour)
 				} else {
 					img.Set(x, y, colour)
diff --git a/storage/diskette.go b/storage/diskette.go
index 30a9169..47a78e8 100644
--- a/storage/diskette.go
+++ b/storage/diskette.go
@@ -32,7 +32,6 @@ func LoadDiskette(filename string) (Diskette, error) {
 	if isFileNib(data) {
 		var d diskette16sector
 		d.nib = newFileNib(data)
-		d.nib.supportsWrite = d.nib.supportsWrite && writeable
 		return &d, nil
 	}