[Coco] Basic09 <==> 6809 interface.

[Allen Huffman]

> On Aug 26, 2023, at 4:43 PM, coco--- via Coco <coco at maltedmedia.com> wrote:
> 
> All
> 
> Has anyone written a program that allows some shared memory buffer between a
> Basic09 program and an OS9 assembler program, so that some variables can be shared
> without having to save them to files in one language and read/write reply in the
> Other ?


OS-9 “data modules” are designed for this purpose. I have used them on later versions of OS-9 for the 68000/PPC/etc. but do not have experience with them under OS-9/6809.

The basic idea is that OS-9 components are modules with a header, body and CRC. For a program the body is the code. For a data module, the body is whatever you want. For example, it could be a compiled list of data for a program to access — useful on a machine without a file system.

You can “link” to a data module and it is mapped in to your 64K user space (on the CoCo 3, or just there on a 64K machine). You get a pointer to the data area and can read/write bytes to it. Other programs can do the same.

I am unaware of any built-in OS-9/6809 resource locking, so that would be needed.

--
Allen Huffman - PO Box 7634 - Urbandale IA 50323 - 515-999-0227 (vmail/TXT only)
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