Tally Genicom Matrix Printer manual Needle Data Byte

Relationship between bits of graphics data and needles (9 needle version)

Each needle in a column is assigned a bit of the data byte.

Needle		Data Byte 1
1	•	Bit 7
2	•	Bit 6
3	•	Bit 5
4	•	Bit 4
5	•	Bit 3
6	•	Bit 2
7	•	Bit 1
8	•	Bit 0

Relationship between bits of graphics data and needles (24 needle version)

When using 24-pin graphics modes, three bytes of data are required for each dot column.

Needle		Data Byte 1	Needle		Data Byte 2	Needle		Data Byte 3
1	•	Bit 7	9	•	Bit 7	17	•	Bit 7
2	•	Bit 6	10	•	Bit 6	18	•	Bit 6
3	•	Bit 5	11	•	Bit 5	19	•	Bit 5
4	•	Bit 4	12	•	Bit 4	20	•	Bit 4
5	•	Bit 3	13	•	Bit 3	21	•	Bit 3
6	•	Bit 2	14	•	Bit 2	22	•	Bit 2
7	•	Bit 1	15	•	Bit 1	23	•	Bit 1
8	•	Bit 0	16	•	Bit 0	24	•	Bit 0

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