Path: utzoo!attcan!uunet!aplcen!samsung!cs.utexas.edu!helios!tecmtyvm!pa163514
From: PA163514@tecmtyvm.mty.itesm.mx
Newsgroups: comp.os.msdos.programmer
Subject: Re: Diskette parameters
Message-ID: <90257.212831PA163514@tecmtyvm.mty.itesm.mx>
Date: 15 Sep 90 03:28:31 GMT
References: <1990Sep11.144431.1@csc.fi>
Organization: Instituto Tecnologico y de Est. Sup. de Monterrey - Campus Mty.
Lines: 48

Vesa Sarkela

You must review, interrupt 21h, service 1Ch

Here is the information,

GET FAT Information for drive
*Interrupt 21h, service 1ch)

Registers on entry
AH: 1Ch
DL: Drive code (A=0, B=1 etc)

Registers on return
AL : Sectors per cluster
BX : Offset address of FAT ID byte
CX : Bytes per sector
DX : Clusters per disk
DS : Segment address of FAT ID byte

Memory affected: None

The FAT ID byte to which DS:BX points indicates the type of disk in use
Actually, this byte indicates only how the disk was formatted. Refer to
next table for more information.

Value Disk Characteristics
  F0        Not identifiable
  F8        Fixed disk
  F9        Double sided, 15 sectors/track
  F9        Double sided, 9 sectors/track(720 Kb)
  FC        Single sided, 9sectros/track
  FD        Double sided, 9 sectors/track (360 Kb)
  FE        Single sided, 8 sectors/track
  FF        Double sided, 8 sectors/track

This could be enough, but if not send me a e-mail

Juan Manuel Gonzalez Nava
Informatic Research Center
ITESM Monterrey Mexico

Bitnet
PA163514@TECMTYVM.MTY.ITESM.MX

Chao. and god look.

There is a new country. Mexico