Re: Checking the existence of a file

Date: Wed, 02 Mar 2016 18:21:50 +0100
Message-ID: <>
Hallo Groepaz,

> IIRC you have to read from the file to get the error, just
> OPEN wont do it.

I already found out myself, as you know. But this Data-Becker book, 
"Das Machinesprache Buch für Fortgeschrittene", page 181, mentions 
that just "OPEN" is should be enough. That is, that's the way I 
understood it. I could be wrong, but it wouldn't be the first time a 
Data-Becker isn't completely right. 

Hallo Patryk,

> 	jsr OPEN
> 	ldx storage_device_number
> 	sec
> 	jsr read_status_channel
> .....
> If you are interested I can put up or send you the remaining parts.

You don't use OPEN itself either. A set Carry as output normally 
means there is an error. But you need it as input for the next 
routine, so you MUST do something ultimately in this 
"read_status_channel" routine to check whether things go wrong or 
right. So I'm at least interested in this one, just out of 

I'm not so interested in the other routines, no offence meant. In 
the past I often accepted routines from other persons, not only ML, 
but also Pascal. And quite often the routines didn't exactly what I 
wanted so I needed to change them. And to understand them took often 
more time than "inventing the wheel for the second time". Another 
thing: you don't learn from copying, but you do from inventing the 
wheel, even if it is the second or even third time.

Kind regards / Met vriendelijke groet, Ruud Baltissen

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Received on 2016-03-02 18:00:11

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