Re: Slot settings on a ROM 3

[shack@southwind.net (Randy Shackelford)]

In article <nipp-1DFFCD.23101616012000@news.planet.nl>,
Pim Blokland  <nipp@plane.nl> wrote:
>In article 
><jonINTERNETrelayCHAT-1601001206420001@nn-157-22-180-139.napanet.net>, 
>jonINTERNETrelayCHAT@napaVALLEYnet.CLARInet (Jon Bettencourt) wrote:
>
>> > > >I cannot execute the 
>> > > >PRODOS command PR#3; this results in a "No device connected" error.
>
>> > Set slot 3 to "Your Card". Switch the machine off (this is for all you 
>> > sceptics) and boot from a floppy that has only ProDOS and Basic.System 
>> > on it.
>> > Now type :PR#3 (That's PR#3, preceeded by a colon.)
>> > This puts you in 80-column mode!
>> 
>> What happens when you type in PR#3 instead of :PR#3? Does it do the same 
>> thing?
>
>No. I cannot execute the PRODOS command PR#3; this results in a "No 
>device connected" error.
>I'm almost certain I've said this before...

If you want a sure fire way to turn on 80 columns, just use a CALL to the
decimal equivalent of $C300. This works since Apple Pascal compatible 80
column displays (which the built in display certainly is) are guaranteed
to be activated when you call their firmware entry point. That's how you
use 80 columns in assembly programs, you don't monkey with PR#'s.
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