Re: 6809 disassembly help wanted

Allen Huffman via Coco <coco-uNHYcr1XS/wmlAP/[email protected]> Fri, 21 Nov 2025 19:54:41 -0600

Newsgroups	gmane.comp.hardware.tandy.coco
Message-ID	<[email protected]>

> On Nov 21, 2025, at 7:24 PM, Sean Conner via Coco <[email protected]> wrote:
> 
>  It's a documented Radio Shack API.  The address $C004 is the function
> pointer to it (like $A000 is the function pointer to scan the keyboard), and
> $C006 is the pointer to a block of memory (at location $00EA) used for
> parameters to DSKCON.  The parameter block is defined as:

Wow, so just a ROM that lets you read or write a sector?

I know Joel Hegberg used it from BASIC so he could make programs that would backup disks with errors and such. That was about the only time I “knew” about it being used.

I see a new blog series coming… (Mostly for my own good. I learned stuff, then forgot it, and search my blog to see what I learned, quite often!)

		— A

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