Remove 2013/cable3 from bugs.md

As the bug status was a missing file and it was actually hd.img and as
that was added to the repo the entry can be removed from the bugs.md
file.

I also added some important points for the entry about quitting
(elaborating) and also how to input certain keys like alt/ctrl
combinations (amongst others) that the author had later on in the
README.md file. The former might especially be important if someone did
it at the console and was not aware of how to open another console but
even so it can be annoying having to close a tab just to stop a program.

Now I can say that 2013/cable3 is almost certainly complete (review
wise?).

2013/cable3/README.md

@@ -8,17 +8,6 @@ An alternate version that should compile in Windows/MS Visual Studio is
 available. See the [Alternate code](#alternate-code) section below.
 
 
-### Bugs and (Mis)features:
-
-The current status of this entry is:
-
-```
-STATUS: missing files - please provide them
-```
-
-For more detailed information see [2013 cable3 in bugs.md](/bugs.md#2013-cable3).
-
-
 ## To use:
 
 ```sh
@@ -32,7 +21,19 @@ For more detailed information see [2013 cable3 in bugs.md](/bugs.md#2013-cable3)
 ./runme
 ```
 
-NOTE: to quit the program type `QUITEMU`.
+NOTE: to quit the program type `QUITEMU`. You might have to be at the top level
+directory of the drive, `A:` or `C:`.
+
+To send an `Alt+XXX` key combination, press (`^A` / `Ctrl+A`) then the key, so
+for example to type `Alt+F`, press (`^A` / `Ctrl+A`) then `F`.
+
+To send an `Fxx` key, press `^F` / `Ctrl+F` then a number key. For example, to
+get the `F4` key, press `^F` / `Ctrl+F` then `4`. To get `F10`, press `^F` /
+`Ctrl+F` then `0`.
+
+To send a `Page Down` key, press `^F` / `Ctrl+F` then `O` (letter O, not digit
+zero). To send a `Page Up` key, press `^F` / `Ctrl+F` then `E`. Other key
+combinations are left for the discovery of the user.
 
 
 ## Alternate code:
@@ -262,7 +263,7 @@ example, with non-QWERTY e.g. international keyboards.
 Most of the time you can just type normally, but there are special sequences to
 get `Alt+xxx` and `Fxxx`.
 
-To send an `Alt+XXX` key combination, press (`^A` or `Ctrl+A`) then the key, so
+To send an `Alt+XXX` key combination, press (`^A` / `Ctrl+A`) then the key, so
 for example to type `Alt+F`, press (`^A` / `Ctrl+A`) then `F`.
 
 To send an `Fxx` key, press `^F` / `Ctrl+F` then a number key. For example, to