Driver for FDD

Aaa, it's time to relax, All. Is it possible to use this subroutine for positioning? I wonder if the sector will deteriorate when recording. B=track number 0..x FDDPOS IN (#F8) LD A,B LD (FDDTS+1),A ; track number SRL B LD C,#3C JR NC,FDDPOS1 LD C,#2C FDDPOS1 LD A,(FDDN) ; drive number OR C OUT (#FF) LD A,B OUT (#7F) IN (#3F) CP B PUSH AF LD A,#18 OUT (#1F) FDDPOS2 IN (#FF) R.L.A. JR NC,FDDPOS2 POP AF CALL NZ,FDDPOS3 IN (#FA) RET FDDPOS3 LD A,#10 FDDPAU LD C,0 FDDPAU1 DEC C JR NZ,FDDPAU1 DEC A JR NZ,FDDPAU RET Why does this routine fail when interrupts are enabled? FDDRD IN (#F8) PUSH DE LD BC,#037F FDDRD1 IN (#FF) AND #C0 JR NZ,FDDRD2 INC DE LD A,D OR E JR NZ,FDDRD1 DJNZ FDDRD1 JR FDDRD4 FDDRD2 INI FDDRD3 IN (#FF) AND #C0 JR Z,FDDRD3 JP P,FDDRD2 FDDRD4 POP DE IN (#FA) RET Well, till next time... ██▓▓▓▒▒▒░░░ ╔══ Sergey aka Cyber from Cobra Software ══╗ █▓▓▓▒▒▒░░░ ╚══════ 500:322/62 ════ 2:462/167.62 ══════╝