Tapes K_0013 to K_0173

• yellow - length of record
• white - line of data
• first two bytes of record consist of length of record in order L2L1( 2 x 8 bits used)
  
• 4E00 length value - 004E (in hex) - 78 bytes decimal
• 0000 length value - 0000 (in hex)- 0 bytes decimal (error on tape)

• record 1 - 78 bytes
• record 2 - 78 bytes
• record 3 - 0 bytes (error on tape)
  
• record 4 - 78 bytes

• step 1 - conversion of bytes to stream of bits
• step 2 - removal first 2 bits in each byte (added in process conversion from 7-track tapes to 9-track tapes)
• step 3 - creating new stream of bits
  

Type of data identification

• type 1 - Data Mode 3 (science data only)
• type 2 - Data Mode 2 (science data and engineering data in order: science - first, engineering - second)
• type 3 - Time Hacks
  

Dividing stream of bits in case Data Mode 2 and Data Mode 3

• 1 - 51         51 bits - unknown
• 52 - 316     265 bits - science data starting from 6 bit in word 2 to word 28 ( 15 bits PN is omitted)
• 317- 456   140 bits - engineering data or science data words 29 to 42
  
• 457- 468   12 bits - binary null
  

Data words

• science data - 10 bits per word
• engineering data - 7 bits per word

Last Updated: 2002.04.05