Commodore 1515 Technical Manual page 11

(3) HAMMER DRIVE (PIN DRIVE) FLOWCHART
NO
RESET PIN CNT
SHIFT PIN-REG
RIGHT BY ONE
FIRST
0
CHARACTER PATTERN "A"
OT
0 ,0 0
-
~
0 0
0
0
0 0 0 0 0
0
0
0
0
r--'r'0
0
SEVENTH DOT
~
) PIN-REG
NO PIN DATA REG
=
1
NO
YES
HEAD COIL
ABOUT
290
p.s
"ON"
PIN CNT
=
PIN CNT+1
END
Figure
7
9
PIN DATA REG
IO~D
)
FIRST DOT
PIN CNT: A counter for pne column (7 dots)
of a character pattenl.
PIN-REG: A register storing one column
(7
dots) of a character pattern.
DOT SNS: Timing signal for each dot.
PIN DATA REG:
One bit register for a dot to be
printed.