[Coco] Color Forth Assistance Request

[Arthur Flexser]

One approach to using Basic operations from a machine-language program is
to set up a buffer containing the command as it would be typed in to Basic,
possibly already tokenized (i.e., use a "save" token byte instead of Ascii
SAVE), and then point Basic to this buffer and have it execute the
command.  There was an article in Rainbow with examples;  maybe someone can
provide the reference.  Pointing Basic to the buffer essentially involves
putting its address into $00A6, the location of Basic's parse pointer.

Art

On Sat, Jan 17, 2015 at 12:57 PM, Stephen Pereira <spereira1952 at comcast.net>
wrote:

> Hello again, all,
>
> As you know from my postings about Color Forth, I have been successful
> with typing in the source code for the Color Forth nucleus (thanks again,
> Brett, for your assistance finding the last few typos!).  With this, the
> ORG of the assembly code can be changed to allow Color Forth to be loaded
> from DECB (HDBDOS in my case) without overwriting any of the disk
> capabilities.  I also have devised a method to pre-load the code for 1 to 8
> Forth screens of Forth code that can be subsequently loaded into Color
> Forth to add in more of the original capability, or the editor, etc.
>
> Now, I would like to add in a simple method for loading and saving a set
> of Forth screens from disk.  What I would like to be able to do is perform
> LOADM"SCRN1TO8" and SAVEM"SCRN1TO8" &H2380 &H43A0 &H5979 from inside Color
> Forth.
>
> I have taken a look at "Disk Basic Unravelled," and I found memory
> locations like Disk File Name Buffer (DNAMBF) and Disk File Extension Name
> Buffer (DEXTBF) which look like places that I could load the file name and
> extension.  I also found the routine at LC48D which is commented as "Open
> Disk File For Read or Write."
>
> However, I have never written my own code to patch into the DECB system
> before, so I am skittish, to say the least.
>
> What I would like to do is write my own code to load the file name and
> extension, the starting and ending addresses for the memory block that I
> would like to save, and call a routine to perform a SAVEM command as if it
> had come in from the Basic command line.  Similarly, I would like to write
> the code to load the file name and extension, and call a routine to perform
> a LOADM command as if it had come in from the Basic command line.
>
> Can anyone offer me some advice on where to look to pick up on the
> specific things that I would have to do in my code to accomplish these
> operations?
>
> Thanks very much, in advance, for your attention and advice.
>
> smp
> --
> Stephen M. Pereira
> Bedford, NH  03110
> KB1SXE
>
>
>
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