DSSD 52 Each 128 Byte Sector Track Format

This is an IBM System 34 Disk 2 Standard format.

Field Length Data Clock Value (179X)
Gap I400xFFNA0xFF
Sync I60x00NA0x00
IM10xFC0xD70xFC
GAP III260xFFNA0xFF
Following repeated 26 times to ***
Sync III60x00NA0x00
AM 110xFE0xC70xFE
Cyl #10-76NA0-76
Head #10NA0
Rec #11-26NA1-26
N10NA0
CRC2CRCNA0xF7 (generates both CRC bytes)
GAP II110xFFNA0xFF
Sync II60x00NA0x00
AM 210xFB0xC70xFB
Data1280xE5NA0xE5
CRC2CRCNA0xF7 (generates both CRC bytes)
GAP III270xFFNA0xFF
***
GAP IV~2210xFFNA0xFF
Total Bytes/Sector189
Total Bytes/Track5208

Bill

1504 MST 8 May 2013