Gemini Industries Printer user manual Fundamentals of Dot Matrix Pfinting

Fundamentals of Dot Matrix Pfinting

Print Head	Print Head	&Bit	7.Bit
Pin Number	(toIN	Interface	Interface
	7	128	ns: used
	.
	.	64	64
	.	32	32
	.	16	18
	.	8	8
	.	4	4
	.	2	2
	.	1	1
	.	not used	not used

d

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			Binary	Pin
Code		Representation		Fired
CHR$(128)		10000000		#l
CHR$(	64)	01000000		#2
CHR$(	32)	00100000		#3
CHR$(	16)	00010000		#4
CHR$(	8)	00001000		#5
CHRS(	4)	00000100		#6
CHR$(	2)	00000010		#7
CHR$(	1)	00000001		#8
CHR$(	0)	00000000		none
CHR$(255)		1 1 1	1 1 1 1 1	all 8
CHR$(	72)	01001000		#2

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