[Coco] m6309 for rsdos

[L. Curtis Boyle]

Didn't someone already do a limited 6309 patch for RSDOS? It was either Sock Master or Robert Gault (or both, maybe). I remember much faster text scrolling routines, etc.

L. Curtis Boyle
curtisboyle at sasktel.net



On Jan 6, 2012, at 9:08 AM, William Astle wrote:

> On 12-01-06 03:35 AM, Earl Casper wrote:
>> Has anyone done a nitro type conversion for rsdos?
> 
> While it is certainly possible to redo rsdos for the 6309, such an undertaking would be somewhat perilous. In particular, there are dozens of EXEC, PEEK, and POKE addresses that many nontrivial rsdos programs rely on. That means it's not really possible to relocate any routines and that negates much of what could be done to improve things.
> 
> If we decided that maintaining entry point compatibility is not important but rather simply implementing the basic interpreter correctly is the goal, there is a lot that could be done to improve performance, even on a plain 6809. In particular, the hires text routines in secb are dreadfully inefficient. Also, the multi rom configuration introduces a lot of inefficiency, too.
> 
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