Commodore RF512C - Page 44

38
Si de one BAM (for RF 512C only) (l oc at e at track 53 sector 0)
BYTE
CONTENTS
3 t'1 08
BAM of s ect or 0 to 7 of track t'.
3t'107 BAM of sector 8 to 16 of tr ack t'.
3t'106
BAM of sector 17 to 23 of tr ack t'.
105 to 255
us ua lly filled with O.
Where t' is t he track no. fr om 36 to 70. and us e 1 in BAM to
indic at e ava ible bl ock .
FIVE VECTOR TABLE (LOCATE AT TRA CK 16 SECTOR 1)
BYTE
CONTENTS
0
next tr ack
1
n ex t se ctor
30f +2
128C +64K+type
30 f+ 3
start track of file f
30f+5 to 30f+L +4
fil e na me wi th leng th L
30f -lL+ 5 to 301 +20
160 if L <16
30 1+ 21
relative file fir st side sector's tr ack
30 f+ 22
rela ti ve file first si de sect or's s ec tor
30 f+ 23
relative fi le's r ecord le ngt h
30 f+ 24 to 30f+ 27
unused
30 f+ 28
start track of repl ac ement @ file
30 f+ 29
sta rt sector of r ep la ceme nt @ f il e
30 f+ 30
low-byte of no. of blocks in fil e f
30f+31
high-byte of no. of bl oc ks in fil e f
Where f is the f il e entry num ber
C is th e f il e closed flag (1 for close)
K is th e l ock ed file flag (1 for l oc ke d)
type file
0 De let ed
1
Se quential
2
Pr og ram
3
Use r
4 Re l at ive