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Fundamentals of Dot Matrix Pfinting
Print Head
Print Head &Bit
7.Bit
Pin Number
(toIN
Interface
Interface
7
.
.
.
.
.
.
.
.
.
d
128
ns: used
64 64
32 32
16 18
8 8
4 4
2 2
1
1
not used
not used
Based on the chart presented above, if you had a 7-bit
computer and wanted to fire pins number 1 and 4 simultaneously,
you would send CHR$(64+8). In other words, you’d send CHR$(72):
Therein is the pattern. Thus, if you wanted to fire all the pins, using
an 8-bit computer, you’d send:
CHR!$(128 + 64 + 32 + 16 + 8 + 4 + 2 + 1) = CHR$(255)
Control
Code
CHR$(128)
CHR$( 64)
CHR$( 32)
CHR$( 16)
CHR$( 8)
CHRS( 4)
CHR$( 2)
CHR$( 1)
CHR$( 0)
CHR$(255)
CHR$( 72)
Binary
Representation
10000000
01000000
00100000
00010000
00001000
00000100
00000010
00000001
00000000
1 1 1 1 1 1 1 1
01001000
Pin
Fired
#l
#2
#3
#4
#5
#6
#7
#8
none
all 8
#2
93