[Coco] 6809 File I/O

[Michael R. Furman]

Bett’s code does exactly this.  I’m not sure exactly which example he is sending but the one I have seen from him uses disk basic rom calls to load the directory structure in memory and open the file; the color basic rom routine to read bytes from the open file; then disk basic rom again to close it.

—

Michael R. Furman
Email: n6il at ocs.net
Phone: +1 (408) 480-5865


> On Mar 18, 2017, at 11:02 AM, Peter Cetinski <pete at pski.net> wrote:
> 
>> On Mar 18, 2017, at 12:32 PM, lost <lost at l-w.ca> wrote:
>> The stuff in the disk edtasm manual assumes you are using that weird color trsdos thing that disk edtasm runs under. In other words,  that stuff isn't for raw disk basic.
> 
> Ah, that makes sense.  I was wondering if anyone actually ever used that EDTASM DOS.  
> 
> So, it looks like there are no documented high level disk routines, like open, write, etc. for RS Disk Basic to use from assembly language?  Is there any way to tap into to the Basic ROM I/O routines?  Or do we essentially have to work at the sector/track level?
> 
> Thanks
> 
>> On Mar 18, 2017, at 12:32 PM, lost <lost at l-w.ca> wrote:
>> 
>> The stuff in the disk edtasm manual assumes you are using that weird color trsdos thing that disk edtasm runs under. In other words,  that stuff isn't for raw disk basic.
>> Disk file IO in asm under disk basic is rather unpleasant since none of the required routines are exposed through a vector table and they are in different locations between the two versions of disk basic. You also have to intercept the error routines if you don't want to drop to basic on error. It can be done but is not particularly pleasant.
>> I did a bit of it with my daggorath update but I don't have the code handy at the moment.
>> -------- Original message --------From: Peter Cetinski <pete at pski.net> Date: 2017-03-18  9:05 AM  (GMT-07:00) To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com> Subject: Re: [Coco] 6809 File I/O 
>> Actually, I meant I was using the examples in the Disk EDTASM manual.  Are those known to work properly?
>> 
>>> On Mar 18, 2017, at 11:00 AM, Peter Cetinski <pete at pski.net> wrote:
>>> 
>>> Can anyone point me to some good 6809 assembly examples of disk file i/o using RS-DOS?  The only examples I could find are in the EDTASM+ manual but I haven’t been successful in getting those working.  Not sure if they are broken or I am broken! :)
>>> 
>>> Thanks
>> 
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