IBM 4400 manual Bit Image Pattern Plan

Chapter 8 Bit Image Graphics

1st Bit Image Data Byte

2nd Bit Image Data Byte

Decimal				7th Bit Image Data Byte
Weights
128
64
32
16
8
4
2
1
73	36	36	73	Decimal
	146	255	146	Values

Figure 29. Bit Image Pattern Plan

A bit image pattern is easily defined by determining the decimal equivalent of the binary data byte. This decimal value may then be included in a program data statement that generates the final Bit Image pattern. To determine the decimal value of a data byte, the decimal weights for each dot are added together. For the seven bytes shown in Figure 29, the decimal values are computed as shown in Table 76.

Table 76. Example Bit Image Pattern Decimal Values

Bit Image
Data Byte			Decimal Weight	Decimal Value
1st byte	64	+ 8 + 1		= 73
2nd byte	128		+ 16 + 2	= 146
3rd byte	32	+ 4		= 36
4th byte	128		+ 64 + 32 + 16 + 8 + 4 + 2 + 1	= 255
5th byte	32	+ 4		= 36
6th byte	128		+ 16 + 2	= 146
7th byte	64	+ 8 + 1		= 73

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