Tom wrote: >Not parity. 3480 is 18 tracks. That's 16 data bits and two parity bits.
Although 8 bit bytes are represented by 9 bit patterns, data bytes are recorded in frames, that are grouped into clusters. 4 tracks are reserved for redundancy check bytes. Up to 14 tracks contain data bytes, but sometimes contain padding, residual, or CRC bytes. For the "control" blocks, tracks are also divided into 6 zones. This info is in the ECMA standard. Regards, Mike Baldwin Cartagena Software Ltd. www.cartagena.com ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
