ND-500(0) compilers and the ND-500 assembler generate NRF files consisting of one or more NRF modules. The modules contain NRF control groups, which are NRF control numbers plus additional information.
NRF Control Numbers
- N: Numeric Field
- S: Symbolic Field
Summary of NRF control numbers
| Control Number |
Mnemonic |
Trailing info |
Brief description
|
| 0 |
NUL |
N |
Symbol ignored
|
| 1 |
BEG |
N |
Beginning of module
|
| 2 |
END |
N |
End of module
|
| 3 |
MSA |
N |
Main start address
|
| 4 |
LIB |
N, S |
Library
|
| 5 |
DEF |
N, S |
Program symbol definition
|
| 6 |
REF |
N, S |
Program reference
|
| 7 |
LRF |
N, S |
Library reference
|
| 10 |
DDF |
N, S |
Data symbol definition
|
| 11 |
DRF |
N, S |
Data symbol reference
|
| 12 |
RMV |
N, S |
Remove symbol
|
| 13 |
SLA |
N, S |
Set load address
|
| 14 |
AJS |
N |
Adjust
|
| 15 |
PMO |
N |
Set progam mode
|
| 16 |
DMO |
N |
Set data mode
|
| 17 |
FMO |
N, S |
Set free mode
|
| 20 |
REP |
N |
Repeat
|
| 21 |
LDI |
N |
Load immediately
|
| 22 |
ADI |
N |
Add immediately
|
| 23 |
APA |
N |
Add program address
|
| 24 |
ADA |
N |
Add data address
|
| 25 |
IHB |
N |
Execution inhibit (compiler errors)
|
| 26 |
EOF |
N |
End of file
|
| 27 |
DBG |
N |
Debug
|
| 30 |
LBB |
N, S |
Library module bytepointer
|
| 31 |
MSG |
N, S |
Message
|
| 32 |
MIS |
N |
Miscellaneous
|
|
|
|
0 GCR0 Start of compound group
|
|
|
|
1 CGR1 End of compound group
|
|
|
|
2 ADD Add reference value
|
|
|
|
3 SUB Subtract reference value
|
|
|
|
4 MUL Multiply by referenced value
|
|
|
|
5 DIV Divide by referenced value
|
| 33 |
LDN |
N |
Load N bytes immediately
|
| 34 |
IL1 |
Illegal
|
| 35 |
IL2 |
Illegal
|
| 36 |
IL3 |
Illegal
|
| 37 |
IL4 |
Illegal
|
