Re: Dhires Programming under ProDOS

[spqr@ruth.uucp (Will Baguhn)]

John Le Febvre <john@klatch.demon.co.uk> writes:

| Anyone know of a site that has documented programs (or just 
| documentation) of programming using the double hires features of the //e
| under ProDOS?
| 
| What's the best place to start?  I used to write assembly for the ][+ 
| years back, and have just got myself a ][+ and 2 enhanced //e's (one 
| 64k, the other 128k).
| 
| Oh yeah, anyone got a 3.5" disk controller they want to sell? ;)
| 
| Thanks
| -- 
| John
| 

ahh... i believe that the approved method is something like this:

1) check to see if there's anything on /RAM, if it exists (likely).
2) if it exists and is empty, remove the driver.  move around the 
devices appropriately.  decrease the device count by one.
3) if it exists and is not empty, ask the user if they REALLY want to 
run the program, given that /RAM is destroyed.  if they say yes, do #2. 
 to be safe, issue a CLOSE and delete all the files on /RAM first.
4) if /RAM doesn't exist, proceeed.

then, at the end....
1) look to see if you HAD /RAM when you started.  if not, skip this 
section.
2) if you had /RAM, restore the device table, the device count, and the 
other things you may have changed (device address for example.. no real 
reason to, you can patch the device table enough without changing the 
address of the driver).

--- email: uwvax!gorgon!ruth!spqr
"Hit paydirt with KDRT!" -- Ford Fairlane, Rock & Roll detective.