NETGEAR XM128 ISDN AND operation to set bit 3 to 0 (binary).

Reference Guide for the Model XM128 ISDN Digital Modem
Status Registers and Result Codes D-3
2. Use TableD-1 to convert the decimal bit value to binary.
3. Use TableD-2 to perform a logic OR operation with the value to set bit 3 to 1 (binary).
4. Use Table D-2 to invert the value using a logic NOT operation and then perform a logic
AND operation to set bit 3 to 0 (binary).
5. Using the resulting decimal value, type the ATS38=n command to set the register.
TableD-1. Binary conversion table
Bit Binary
value Decimal value Hexadecimal value
0 00000001 1 $01
1 00000010 2 $02
2 00000100 4 $04
3 00001000 8 $08
4 00010000 16 $10
5 00100000 32 $20
6 01000000 64 $40
7 10000000 128 $80
TableD-2. Setting bit 3
Operation Example 1
Binary Decimal Hexadecimal Example 2 Binary Decimal Hexadecimal
OR 10001000 136 $88 01000000 64 $40
00001000 8 $08 00001000 8 $08
10001000 136 $88 01001000 72 $48
NOT 00001000 8 $08 00001000 8 $08
11110111 247 $F7 11110111 247 $F7
AND 10001000 136 $88 01000000 64 $40
10000000 128 $80 01000000 64 $40