Commodore MPS-801 - Hammer Drive Flowchart

2. Hammer drive (pin drive) flowchart
NO
PIN CNT=
PIN CNT+1
END
CHARACTER PATTERN "A"
FIRST 0
OT
-
f6.
CJ
(I
<a
"
~
()
(I
aJ
Q
0
C»
~
~
()
~
i
S)
I
..
3
I
c.
SEVENTH DOT
) PIN-REG
PIN DATA REG
11111 r1111110~D
)
PIN CNT:
PIN REG:
DOT SNS:
PIN DATA:
REG
FIRST DOT
Counter
for 1 column (7 dots)
of character pattern
Register storing 1 column (7 dots)
of character pattern
Timing signal
for each dot
1 bit register for a dot
to be printed
4