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+.h 1 1 2/3/78
+.th as80
+.sh NAME
+as80 \*- assembler for the 8080 and Z80 microprocessors
+.sh SYNOPSIS
+.bd as80
+[
+.bd \*-lhzi
+] name ...
+.sh DESCRIPTION
+.it as80
+assembles the concatenation of the named files.
+The output of the assembly is left on the file
+.bd "80.out".
+It is executable if no errors occurred
+during the assembly,
+and if there were no unresolved external references.
+.s1
+The -l option causes as80 to produce a listing
+on the standard output.
+.s1
+The -h option causes as80 to produce the output listing
+in hex. Octal is default.
+.s1
+Register names:		a,b,c,d,e,h,l,af,bc,de,hl,ix,iy,sp
+.br
+Condition codes:		nz,z,nc,c,po,pe,p,m
+.br
+Psuedo operations:	.globl,.text.textorg,.data,.dataorg
+.br
+			.bss,.bssorg,.byte,.word,.list,
+.br
+.s1
+.s3
+.sh FILES
+as80	the assembler
+.br
+"80.out"
+.br
+OPCODES	the external instruction set
+.sh DIAGNOSTICS
+When
+an input file cannot be read, its name and
+a "can't open" diagnostic is produced and assembly
+ceases.
+Whenever sytactic or semantic errors are
+encountered,
+a single-character diagnostic is produced.
+The possible diagnostics are:
+.s3
+.ta 3
+\. moving dot backwards
+.br
+[ byte constant error
+.br
+(	Parentheses error
+.br
+"	String not terminated properly
+.br
+E	Illegal expression
+.br
+R	Illegal register usage
+.br
+G	Garbage (unknown) character
+.br
+M	Multiply defined symbol
+.br
+P	`\fB.\fR' different in pass 1 and 2
+.br
+T	A 16 bit expression has been truncated to an 8 bit value
+.br
+U	Undefined symbol
+.br
+X	Syntax error
+.br
+.sh BUGS
+.s1
+If  .list 1  is ever encountered,
+a listing will start to come out
+whether or not  -l  was selected.