In article ,
 "Dave Althoff, Jr."  wrote:

> John B. Matthews  wrote:

> : Alternatively, if the loader enables 80 columns, printing control-Q and 
> : control-R switch to 40- and 80-columns, respectively.

> Be careful.  I always made it a habit to only use the 80-column 
> display driver in 80-column mode, and if I wanted to operate in 
> 40-column mode, I always went back to the non-80-column display 
> driver by printing a CHR$(21).  When I started 80-column mode, I was 
> always careful to print something (a few spaces will do) on the 
> screen, then clear it, because some versions of the 80-column 
> firmware would behave strangely if I didn't.

Experimenting with the firmware already enabled:

putchar('\x11'); // switches to 40-columns
putchar('\x12'); // switches to 80-columns

Your suggestion is probably the right thing to do when initializing the 
firmware, perhaps in the loader.

-- 
John B. Matthews
trashgod at gmail dot com
home dot woh dot rr dot com slash jbmatthews
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