Driller/Internals

Some Driller discs still contain left over data. This is most interesting part:

MOVE  PROCESS  SORT  DRAW OBJECTS
 DRILLER MONITOR VERSION THREE  
                                
               MAIN MENU        
                                
B - 
Break to Rom-WACK (beware)  
C - 
Edit
?l dataset colours        
E - 
Edit object ( under sights )
F - 
Edit the Data File header   
G - 
Edit Global conditions      
H - 
Edit current data set header
L - 
Edit local conditions       
O - 
Edit object ( give number ) 
R - 
Redraw screen but don't exit
S - 
Save datafile to disk       
W - 
Write a screen shot to disk 
X - 
Extract datafile from disk  
       ----SWITCHES----         
I - ON  
Superimpose view        
M - OFF 
Superimpose timings     
V - CRL 
Toggle vehic
Ple type

One disk used to contain some documentation (or executable?) of the "Driller Monitor version 3", which apparently was some kind of primitive editor and debugging tool for the creation of game. It also comes with a list of opcode names, which reveals the names of the unused ones (0x16, 0x17 and 0x18):

CLIMB  
FALL   
EXTEND