ND Relocatable Format

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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