Building a DATA table in SXB

RS_Jim

Hi,
I am trying to build a data table with a series of 4 digit numbers. I would like to retrieve each entry·as a word with two digits in each byte.· However, when I enter the data in the form of:
WDATA 0175.0249,etc the compiler is giving me:
0075 0001 0049 0002 etc.· I have tried entering it as 75,01,49,02 etc and I have tried $0175,$0249 etc
Each time the compiler gives me back two words with leading 0.· What is the secret of building this table?

Jim

Zoot

If you are using WREAD in SX/B then it will work. The reason you are seeing "leading zeros" in compiler output is because instructions and data statements on the SX are actually 12 bits. In the case of SX/B data the upper 4 bits are not used. So a "Word" data chunk is actually two 12 bit data instructions, where only the lower 8 bits of each are used.

So if the "Word" data I wanted to write (say it was BCD numbers) is:

$1776

I would expect to see two 12 bit instructions in the compiler output:

DW $076 ' upper 4 bits of instruction = 0, lowest 8 bits are the low byte of my "Word" data
DW $017 ' upper 4 bits of instruction = 0, lowest 8 bits are the high byte of my "Word" data

In assembly and in SX/B 2.x there are strategies for using the whole 12 bits in cases where 12 bits is enough but 8 bits are too few. Or if you want to really "compact" Data by stuffing three 16 bit words into four data instructions (a savings of two instructions).

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Bean

Jim,
If you post your code that would help alot.
It sounds to me like you want:

DATA 75,01,49,02 ' Note this is NOT WDATA

Bean.

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·

RS_Jim

Thanks for the imput guys, Zoot i get invalid command when I try to use WREAD.· I did however run my program under debug and read would return the low byte first and the high byte second so my worries were for naught!
Jim
·

Zoot

Sorry, brain fart -- I meant if you have WDATA statements and use READ into a Word variable, it will work. As you found out.

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