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7 The SASM Assembler

SX-Key/Blitz Development System Manual 2.0

• Parallax, Inc. • Page 51

7.3.5

The DS Directive

The DS (define space) directive increments the location pointer during assembly. This may be used to

cause the assembler to arrange sequential RAM assignments (arrays). For example:

ORG

$08

Array

Other

defines 3 bytes, starting at location 8, for the Array symbol. Array+1 is the second element of the array

and array+2 is the third element. The Other symbol’s first and second elements are placed starting with

location $0B. Note that no code is generated in the example above.

Instead of the DS, you may alternatively use the words RES or ZERO; they have the same meaning.

7.3.6

The DW Directive

The DW (define word) directive defines 12-bit words in EEPROM. This is used to store a data table in

the SX EEPROM space. For example:

$FFF, $009, $1A0

stores the values $FFF, $009 and $1A0 into EEPROM starting at the current location. You may also use

the DW directive to define a sequence of ASCII characters like in

“hello”

This creates a data table in the EEPROM containing the ASCII codes of the characters specified in the

string, i.e. $068, $065, $06C, $06C, $06F. See Chapter 10.5 – Creating Tables for more information on

using tables.

7.3.7

The END Directive

The END directive indicates the end of the source code in a file. Any text that follows the end directive

is ignored by the assembler.

This feature is handy when you want to add any kind of comment text to the end of the source code file

without the need to mark each line as a comment.

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