CDOS assembly program help

[Chris LaFond]

Hello everyone,

I am attempting to write a simple hello world program with the Cromemco
Macro assembler. I am having a problem with outputting a string and I am
hoping someone could clarify.

Here is some code:

LD    C,09H    ; set up to print buffer

LD    DE,MSG    ; load string address to DE register

CALL    05H     ; call CDOS

MSG:    DB    'Hello,World!',0


the code works but keeps outputting characters past the hello world
string. From what I have read it will keep reading until it hits a null
character (Which I think is 00H)

Could someone hold my hand and tell me how to add a null character to
the end of the string?

Thanks!

[curt mayer]

It's not a null that ends a string for this bdos call.  It's a dollar sign.

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[Roger Hanscom]

Hi CHris --

If you are using CP/M 68k, I think it wants a '$' as end of string (just like Z80 CP/M??).  Easy enough to experiment with.

Roger

[Chris LaFond]

Thanks for the quick response.

Doing this works:

DB 'Hello,World!$'

So my next step was a carriage return and line feed.

CR:    EQU    0DH

LF:    EQU    0AH

DB    'Hello, World!',CR,LF,'$'

Is this the correct way to add CR-LF to the end of the string?

You guys are awesome! Thank you so much for the help.

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[Aron Hoekstra]

yep just don't forget to add:

CR: EQU 0DH ;CARRIAGE RETURN
LF: EQU 0AH ;LINE FEED

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[Aron Hoekstra]

nevermind i see you already had it! haha

[Bill Mahoney]

Hi Cromemco fans! 

Hey, I am trying to rid myself of Cox Cable and go somewhere else. Who actually handles the mailing list these days? Sorry to blast this to everyone but I’d like to continue to “listen in” (particularly on the IDE drive conversation!) but who do we ask now to change an email account? 

You can answer directly to avoid clutter for everyone else - bi...@billmahoney.com

Thanks

Bill

[Mike Stein]

Looks like this has been taken care of, correct?

m

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[Bill Mahoney]

It seems so, the last few notes about ordering the IDE boards have appeared “in the right place”. I’m interested to see how it goes. (I was a part-owner in an embedded systems manufacturing company and if I was still a part-owner I’d offer to do the SMT.)

Thanks! 

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[Mike Stein]

Excellent; Marcus and I share management of the group but I've been away for a few weeks. Looks like he took care of it.

m

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