; File control block
FCB_DRV: EQU 0  ; BYTE 0=A: 1=B: 2=C: ...
FCB_NAM: EQU 1  ; 8 BYTES, space padded
FCB_EXT: EQU 9  ; 3 BYTES, space padded
FCB_TYP: EQU 12 ; BYTE FCB type
; TYP=1: regular file
FCB_BLK: EQU 13 ; current 128b block in sector
FCB_CLU: EQU 14 ; current sector
FCB_LFT: EQU 16 ; bytes left to read in current file
FCB_END: EQU 20 ; FCB length