Commodore MPS 1200 - Nine-pin Graphics

Changing Graphic Density
Format
BASIC
Hex
chr$(27)"?n" chr$(m)
1B 3F nh mh
(n = K, L, V or Z) (m = 0 to 7)
(nh = CBh, CCh, D9h, DAh)
(mh = OOh to 07h)
This command changes one graphics mode to another. Any of the
four graphics
commands, ESC K, ESC L, ESC Y, or ESC Z can be
changed
to any of the densities available with the ESC * command.
Put the letter of the command that you want to change (K, L, Y or
Z) in place of the variable n, and the value of the graphics density
that
you want in m. For example, to change the ESC K command
to double density, the command would be: chr$(27) "?K" chr$(1).
Each density value
you can select for m is shown above in Table
6.2.
Nine-pin Graphics
Format
BASIC
chr$(27)" i "chr$(m)chr$(n1 )chr$(n2)
(m =0 to 1)
Hex
1B 5E mh n1h n2h
At the beginning of this chapter we mentioned that the bottom-
most pin on the print head was not normally used for graphics. It is
possible
to use this ninth pin, although it requires.a little more
programming.
The nine-pin graphics mode has the advantage of being a little
faster
than the normal seven- or eight-pin mode since nine dots at a
time instead of seven of eight. The disadvantages are that only
single
and double density are available with nine pins, and that it
requires twice
as much data-two ASCII codes for each column of
dots.
6-10