Commodore MPS 1200 - Page 148

o
o
o
o
o
o
o
o
v Print head
12 B 64 32 16 B 4 2
If attribute byte is 12B or more, top B
pins are used.
o - Bottom print wire not used
v Print head
o - Top print wire not used
10 I
[J
o
o
o
o
o
o
o
o
12 B 64 32 16 B 4 2
If attribute byte is less than 12B,
bottom B pins are used.
Figure 8-4. The high order bit of the attribute determines which
pins will be used.
The attribute byte also contains information that can be used if you
want to print your characters with proportional width (Chapter 3
tells how to select proportional printing). With proportional width
printing some characters will be narrower than others. You must
still send data (even ifit is zero) for all eleven dot columns. With the
attribute byte you can specify the starting and ending columns that
you want to print. The columns, which are numbered 0 through
10, are identified at the bottom of Figure 8-5. Bits 4, 5, and 6 are
used to specify the starting column. The ending column is defined
by bits 0 to 3.
8-6