Commodore 1541 - Page 43

Table 7.1: RELATIVE FILE FORMAT
r>ATA m.ncK
BYTE
0,1
2—256
DEFINITION
TnrV ™H hlnrl- nf npxr daia block.
254 bytes of data. Empty records contain FF (all binary ones) in the
first byte followed by 00 (binary all zeros) to the end of the record.
Partially filled records are padded with nulls (00).
SIDE SECTOR BLOCK
BYTE
0,1
2
3
4,5
6,7
8,9
10,11
12,13
14,15
16-256
DEFINITION
Track and block of next side sector block.
Side sector number. (0-5)
Record length.
Track and block of first side sector (number 0)
Track and block of second side sector (number 1)
Track and block of third side sector (number 2)
Track and block of fourth side seclor (number 3)
Track and block of fifth side sector (number 4)
Track and block of sixth side sector (number 5)
Track and block pointers to 120 data blocks.
Upon execution, the DOS first checks to see if the file exists. If it does, then
nothing happens. The only way to erase an old relative file is by using the SCRATCH
command (see chapter 4), but nol by using the replace option.