[Coco] Cave Walker & Issues with VCC was OS9 Lv 1 games

[Barry Nelson]

Sorry Robert, but I have to differ with you there. Some level 1 games (I don't remember which ones) may not run on OS9 level 2, but Cave Walker was designed to run on OS9 level 2 as well as level 1, and does run on Microware OS9 level 2, but does NOT run on NitrOS9 level 2 on real hardware. Strangely it does run on NitrOS9 level 2 on VCC. Quoted from the manual (page 1, right after the table of contents):

The following equipment is optional: 
	• Second disk drive
	• Tandy hard disk system
	• OS-9 Level Two (provides additional colors and RGB support)

Running it this way utilizes the palette registers in a CoCo 3 to both display color on an RGB monitor and also uses some additional colors.

> Robert Gault robert.gault at att.net 
> Thu Oct 6 15:23:55 EDT 2016
> Guys,
> 
> Keep in mind that Cave Walker and other level1 games at best use Level1V2.00. 
> I've tested a stock L1V2 system disk with VCC (any version) and OS-9 will freeze 
> when asking you to insert the date/time. The same disk will run with MESS and a 
> real Coco3. It will even run with a Drivewire HDBDOS ROM on a Coco3 from a 
> hardware floppy.
> 
> As an experiment, you can almost get Cave Walker to run on VCC if you delete or 
> rename CMDS/setime, preventing setime from running. You will see a WHAT? as OS-9 
> starts and then the program will start. Unfortunately, when you get to the main 
> screen, you will see only the background and not your player.
> In short, VCC with L1V2 seems to be unable to accept data from the keyboard.
> 
> It may be possible to change some modules in the L1V2 OS9Boot file so that it 
> will work with VCC. Better would be to "correct" VCC.
> 
> Robert