Split up the subtypes of ECMA-35 escape sequences

These all have slightly different semantics (that don't matter yet),
so split the up appropriately.

src/conio/cterm.adoc

@@ -37,7 +37,7 @@ received:
 Any normal printable character when the cursor is at the right
 margin (of the screen or scrollable area).
 
-== Control characters
+== C0 Control characters
 
 === `0x00` NUL (`NUL`)
 In doorway mode, indicates that the next character is
@@ -86,11 +86,25 @@ not valid, the `ESC` is ignored.
 
 SOURCE: <<ECMA-48>>
 
-== Control Codes
+== nF Escape Sequences
 
-Control codes are in the following format: +
-`ESC {'0'` to `'~'}`
-Legal combinations which are not handled are silently dropped.
+nF Escape Sequences are in the following format: +
+`ESC {SPACE to '/}{'0'` to `'~'}` +
+There may be multiple characters from the {SPACE to '/'} before the
+terminating {'@' to '~'} character.
+
+At present, CTerm does not support any nF escape sequences.
+
+SOURCE: <<ECMA-35>>
+
+== Private control functions
+
+Private control functions are in the following format: +
+`ESC {'0'` to `'?'}` +
+
+SOURCE: <<ECMA-35>>
+
+Legal combinations not handled are silently dropped.
 
 === `ESC 7` Save Cursor (`DECSC`)
 Saves the current cursor position same as `CSI s`
@@ -102,6 +116,12 @@ Restores the current cursor position same as `CSI u`
 
 SOURCE: <<VT102>>
 
+== Control functions in the C1 set
+
+Control codes are in the following format: +
+`ESC {'@'` to `'_'}`
+Legal combinations which are not handled are silently dropped.
+
 === `ESC E` Next Line (`NEL`)
 Moves to the line home position of the next line.
 (Same as `CR` `LF`)
@@ -533,22 +553,20 @@ transfer.
 	`CSI = 1 ; pR - n`
 	pR is 0 if JXL support is not available, and 1 if it is.
 
-=== `ESC c` Reset to Initial State (`RIS`)
-Resets all the terminal settings, clears the screen, and homes
-the cursor.
+== Standardized single control functions
 
-SOURCE: <<ECMA-48>>
+Standardized single control functions are in the following format: +
+`ESC {'\`'` to `'~'}` +
 
-== nF Escape Sequences
+SOURCE: <<ECMA-35>>
 
-nF Escape Sequences are in the following format: +
-`ESC {SPACE to '/}{'0'` to `'~'}` +
-There may be multiple characters from the {SPACE to '/'} before the
-terminating {'@' to '~'} character.
+Legal combinations not handled are silently dropped.
 
-At present, CTerm does not support any nF escape sequences.
+=== `ESC c` Reset to Initial State (`RIS`)
+Resets all the terminal settings, clears the screen, and homes
+the cursor.
 
-SOURCE: <<ECMA-35>>
+SOURCE: <<ECMA-48>>
 
 == Control Sequences:
 

src/syncterm/CHANGES

@@ -7,6 +7,7 @@ Don't disable status line for Atari ST modes
 Fix broken vertical (U+00A6) vs. vertical line (U+007C)
 Add custom palette support to list file
 Pass control key combinations in BBC Micro mode
+Add support for DECSC/DECRC control codes
 
 Version 1.6
 ------------