DDT debugging newbie guide.

README.md

@@ -80,7 +80,10 @@ Here is an overview of the repository:
 
 See the [`doc` subdirectory](doc) for documentation.
 
-There's a [DDT cheat sheet](doc/DDT.md) for Unix users.
+There are some short introductions for beginners:
+- [DDT cheat sheet for Unix users](doc/DDT.md)
+- [TECO survival guide](doc/TECO.md)
+- [DDT debugging newbie guide](doc/debugging.md)
 
 A list of [known ITS machines](doc/machines.md).
 

doc/debugging.md

@@ -0,0 +1,32 @@
+# DDT debugging newbie guide
+
+Notes where exec DDT differs from timesharing DDT.
+
+| Command | Timesharing DDT | Exec DDT
+| --- | --- | ---
+| *file*^K | Start program without symbols loaded | N/A
+| ^Z | Suspend program | N/A
+| $P | Continue
+| $^K | Load symbols | N/A
+| *name*$J | Create job named *name* | N/A
+| $L *file* | Load *file* into current job, including symbols | N/A
+| $^X. | Kill current job | N/A
+| $G | Run program from start
+| $0G | Set PC to starting address | N/A
+| *n*$B | Set breakpoint at *n*
+| $B | Remove breakpoint at current location | Remove all breakpoints
+| .$B | Set breakpoint at current location
+| . | Current location
+| $Q | Last printed quantity
+| *n*/ | Open location *n* symbolically
+| / | Open $Q
+| ^J | Open next location
+| ^ | Open previous location
+| *n*[ | Open location *n* numerically
+| = | Print $Q numerically
+| _ | Print $Q as a symbol
+| ' | Print $Q as six SIXBIT characters
+| " | Print $Q as five ASCII characters
+| # | Print $Q as one ASCII character | N/A
+| ^N | Single step | N/A
+| $^N | Stop at next instruction | N/A