Epson CP/M directory structure (TF-20 compliant)

UU F1 F2 F3 F4 F5 F6 F7 F8 T1 T2 T3 EX S1 S2 RC
AL AL AL AL AL AL AL AL AL AL AL AL AL AL AL AL

UU - user number: 0 - 15, unused/erased: e5
Fx - file name padded with spaces
Tx - file extension padded with spaces
     T1 bit 7: 1 - read-only, 0 - read/write
     T2 bit 7: 1 - system file, 0 - plain file
EX - bit 0: (probably) 0 for final extend, 1 for intermediate extend
     bit 1 - 6: extend number lower bits
S1 - reserved set to 0
S2 - extend number upper bits
     extendnumber = EX/2 + S2*32
RC - number of records in current extend (80h, 128 is maximum)
     an record is 128 bits. So 128 * 128 = 16 kByte per extend.
AL - allocation block space. 0 is not used.

