IBM System/360

Data Format (2303)
Lead Area 65 Bytes Ones
Address Mark Area
20 Bits at 2/3 Freq
Bit Ring Sync Area
4 Bits Zeros
l Bit One
2 Bits Zeros
I Bit One
11111111 11111111 11111111 llllllllllllllllllli 11111111 00000000 00001001
lead Byte
Ones Ones
1 l 0 0 1 l 0 0 I l 1 l 1 1 l l l l l l 1 I l l
lead Byte 51 Bytes Ones
Ones Ones
l 1001 1 0 0 11111111 11111111
33 Bytes Ones
Ones
Bit Ring Sync Area
Zeros 4 Bits Zeros
3 Bits Ones
l Bit Zero
11111111 11111111 11111111 00000000 00001110
Address Mark
Bit Ring Sync Area
20 Bits at 2/3 Freq
Ones Ones Ones Ones Zeros
11111111 11111111 11111111 111111 J l 00000000
4 Bits Zeros
3 Bits Ones
J Bit Zero
00001110