QD 8080 Assembler Instructions
	(This web page updated 24-Jan-1999)


1.	At TRSDOS Ready, type:    QD <ENTER>

2.	At the prompt:
		Source Filename>

	type the name of the file you want to assemble.
	Be sure to include the extension if the file has one.

3.	At the prompt:
		Object Filename>

	type the name of the file you want the program
	stored in.  BE SURE YOU ENTER A NAME DIFFERENT
	FROM THE ONE YOU SPECIFIED AS THE SOURCE FILENAME.

4.	QD will then display:
		Do you want to output the listing to the printer?

	Respond 'Y' or 'N'.  
	Note:   If you are using LINK *DO *PR command to copy
		all screen output to the printer,  reply 'N'.


5.	If there are errors during Pass 1, the assembler will allow
	you to stop the program and fix them without running Pass 2.


Program Format and Assembler Directives for QD 8080 Assembler

label	operation   operand  comment

The label field takes the form:

	symbol:

The label field contains a sequence of alphabetics, numerics, period,
percent-sign and dollar-sign, the first character of which must
be a letter.
Labels may be used on any line, but cannot exceed 8 characters in length.

The operation field contains an assembler directive or 8080 machine operation
code.

The valid assembler directives are:

	PSECT or ORG		sets the program or data origin
	END			terminates the physical program
	EQU			performs a numeric equate
	DEFB or DB or BYTE	defines data bytes
	DEFW or DW or WORD	defines words of storage (double bytes)
	ASCII or TEXT		defines strings of bytes

The operand field of the statement contains an expression formed from
constant and label operands, with arithmetic, logical, and relational
operands on these operands.

The valid operators are:

		arithmetic
		    +
		    -
		    *
		    /
		    ^

The precedence of these operators is:

		  (  )
		   ^
		  *  /
		  +  -

A leading semicolon character denotes the comment field, which contains
arbitrary characters until the next carriage return or exclamation point
character.