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
08	NUL	N	Symbol ignored
18	BEG	N	Beginning of module
28	END	N	End of module
38	MSA	N	Main start address
48	LIB	N, S	Library
58	DEF	N, S	Program symbol definition
68	REF	N, S	Program reference
78	LRF	N, S	Library reference
108	DDF	N, S	Data symbol definition
118	DRF	N, S	Data symbol reference
128	RMV	N, S	Remove symbol
138	SLA	N, S	Set load address
148	AJS	N	Adjust
158	PMO	N	Set progam mode
168	DMO	N	Set data mode
178	FMO	N, S	Set free mode
208	REP	N	Repeat
218	LDI	N	Load immediately
228	ADI	N	Add immediately
238	APA	N	Add program address
248	ADA	N	Add data address
258	IHB	N	Execution inhibit (compiler errors)
268	EOF	N	End of file
278	DBG	N	Debug
308	LBB	N, S	Library module bytepointer
318	MSG	N, S	Message
328	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
338	LDN	N	Load N bytes immediately
348	IL1	Illegal
358	IL2	Illegal
368	IL3	Illegal
378	IL4	Illegal