[Coco] DLOAD (was: Re: Stupid Cassette Port Tricks, (was: Re: Coco and .WAV files))

[Arthur Flexser]

That bug was fixed in Color Basic 1.1, so between the general obscurity of the
DLOAD command and the quick fix, I wonder how many people ever ran into it.

Art

On Sat, 2 Feb 2008, Neil Morrison wrote:

> 
> Also see http://tech.groups.yahoo.com/group/ColorComputer/files/DLOADM
> Bug.htm
> 
> "The mystery surrounding the DLOADM command"
> 
> DLOADM Bug
>       The mystery surrounding the DLOADM command in Extended Color Basic as
> discussed in "CC DLOAD" (80 Micro, March 1983, p. 140) is easily cleared up.
> A bug in the ROMs prevents a DLOADM command from being recognized as such.
> 
>       For a simple fix, use
> 
> CLOSE #-l : POKE &H78, ASC("M"): DLOADM "filename," baud, offset.
> 
> Baud has the same value as DLOAD and offset has the same value as CLOADM.
> 
>       As with CSAVEM and CLOADM, there is no DLOADM token, just DLOAD
> followed by an ASCII M. On encountering a DLOAD or DLOADM command, the next
> byte from the Basic program loads into the A register (an ASCII M if the
> command was DLOADM). This first step is common to most commands and occurs
> before jumping to the DLOAD routine.
> 
>       Second, a subroutine closes the cassette file if it's open (DLOAD or
> DLOADM needs the buffer). Then the A register is checked to see if it
> contains an ASCII M, and a flag byte is set or cleared accordingly.
> 
>       Unfortunately, the second step causes the contents of the A register
> to change; consequently, the third step does not recognize DLOADM. This bug
> could have been corrected by exchanging the second step for the third.
> 
> Ralph Fox
> 
> 4212 Wadsworth Ct. #102
> 
> Annandale, VA 22003
> 
> 
> Neil
> 
> ----- Original Message ----- From: "Arthur Flexser" <flexser at fiu.edu>
> 
> > That message, by the way, is the only known reference in the CoCo literature to
> > the talented author of the CoCo ROMs (other than Super Extended Basic), Mark
> > L. Chamberlin, who also apparently wrote the ROM for the Micro CoCo and hid his
> > name within it.
> > 
> > Art
>