Operators

+

expr1 + expr2

expr1 plus expr2

–

expr1 - expr2

expr2 minus expr1

-expr

Negation of expr

*

expr1 * expr2

expr1 times expr2

/

expr1 / expr2

expr1 divided by expr2

%

expr1 % expr2

Remainder of expr1 divided by expr2

<<

expr1 << expr2

Logically shifts expr1 left expr2 times.

>>

expr1 >> expr2

Logically shifts expr1 right expr2 times.

~

~expr

One's complement of expr

=

expr1 = expr2

1 if expr1 is equal to expr2. 0 otherwise.

==

expr1 == expr2

Same as =

!=

expr1 != expr2

1 if expr1 is not equal to expr2. 0 otherwise.

<

expr1 < expr2

1 if expr1 is less than expr2. 0 otherwise.

>

expr1 > expr2

1 if expr1 is greater than expr2. 0 otherwise.

<=

expr1 <= expr2

1 if expr1 is less than or equal to expr2. 0 otherwise.

>=

expr1 >= expr2

1 if expr1 is greater than or equal to expr2. 0 otherwise.

&

expr1 & expr2

Bitwise AND of expr1 and expr2.

|

expr1 | expr2

Bitwise OR of expr1 and expr2.

^

expr1 ^ expr2

Bitwise XOR of expr1 and expr2.

Directives

\

Adds a newline to the source code, for putting multiple instructions on one line.

ADDINSTR

Defines an additional instruction. See TASMTABS.HTM.

.addinstr instr args opcode nbytes rule class shift binor

BLOCK

Advances the instruction pointer a specified number of bytes without assigning values to the skipped over bytes.

.block expr

BYTE

Inserts a byte value or series of byte values.

.byte expr[,expr ... ]

CHK

Calculates a checksum from a specified address up to but not including the address of the directive. The checksum is the least significant byte of the sum of all bytes.

.chk address

DB

Alternate form of BYTE.

DW

Alternate form of WORD.

#DEFINE

See Day 3 for a full explanation of this directive.

DEFCONT

Adds to the last macro started with a DEFINE.

ECHO

Outputs a string or expression to the screen.

.echo "string"
.echo expr

#ELSE

See #IF, #IFDEF, or #IFNDEF.

END

Signifies the end of the source file.

.end

ENDIF

See #IF, #IFDEF, or #IFNDEF.

EQU

See Day 3 for a full explanation of this directive.

FILL

Fills a number of bytes with one value. If the value is ommitted the default value of 255 is used.

.fill bytes[,value]

#IF

Assembles a block of code if the supplied expression evaluates as non-zero. Otherwise, the block of code following the #ELSE directive (if there is one) is assembled.

#if	expression
	code
[#else
	code]
#endif

#IFDEF

Assembles a block of code if the supplied macro has been defined. If the macro has not been defined, then the block of code following the #ELSE directive (if there is one) is assembled.

#ifdef	macro_name
	code
[#else
	code]
#endif

#IFNDEF

Exactly the same as #IFDEF, except the block of code is assembled if the supplied macro has not been defined.

#ifndef	macro_name
	code
[#else
	code]
#endif

#INCLUDE

Reads the contents of the supplied file into the source file.

#include "filename"

LIST

Turns on output to the listing file.

.list

LOCALLABELCHAR

Defines the character used to designate a local label.

.locallabelchar "character"

LSFIRST

Defines byte order for the WORD directive to be little-endian.

.lsfirst

MODULE

See Day 3 for a full explanation of this directive.

MSFIRST

Defines byte order for the WORD directive to be big-endian.

.msfirst

NOLIST

Turns off output to the listing file.

.nolist

ORG

Sets the instruction pointer to the supplied value.

.org expression

SET

Changes the value of a manifest constant. This directive often results in "label value misaligned" errors.

symbol .set expression

TEXT

Assigns a sequence of bytes values based on an ASCII string. A zero is automatically added to the end.

.text "string"

WORD

Inserts a word value or series of word values.

.word expr[,expr ... ]