[Color Computer] [coco] Learning assembly for OS-9

[Robert Gault]

Start by making an outline that describes exactly what you are trying to 
do. The outline will be a block diagram without too much detail at this 
time in the process. Once you have your outline, you will need to 
consult the OS-9 Technical Reference portion of your OS-9 manual. If you 
don't have one, you will need something equivalent or you won't make any 
further progress.

Decide which type of driver you are interested in, Random or Sequential. 
The manual will help you with this by giving examples and samples of 
programming. Study the appropriate section to determine if the driver 
you want to write already exists. Also check RTSI for a pre-existing driver.

If indeed you will be creating a new driver, try to follow the model 
drivers described in the manual. Study the Init section to determine 
what information will be sent to your driver by the system. Decide what 
type of user interaction you want via the Get/Setstat calls. Determine 
what if any IRQs will be needed and how such a routine should be set up. 
Finally be sure to study the chapter on System calls. You may find that 
you won't need a driver but can use a pre-existing Get/Setstat call or 
some other User or System Mode call.

===============================================

Aside from the above, you pretty much have to learn by trial and error 
(with a lot of the latter.) Write some code and if it does not do what 
you want, post a portion of your code and the errors you are getting. It 
is much much easier to answer specific questions than general ones.

George Ramsower wrote:
> How would one go about learning to write assembly for OS-9.
> 
> I tried once but couldn't figure out(understand) the sequence of events that 
> are necessary to get a working module assembled.
> 
> I want to build a couple of drivers and device descriptors. How is that 
> done?
> 
> I have all the OS-9/Microware tools to do this. I even have a C-compiler.. 
> don't understand that one either.
> 
> 
> George 
> 
> 
> 
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