Sharp MZ-3500 Manuel d'utilisateur télécharger pdf (Page 47)

M Z 3500

5. MFD INTERFACE

5-1. Outline

Floppy disk IS a disk which is made of a mylar sheet whose

surface is coated with magnetic particles and set on the

device to write and read data on the surface of the disk

It will be necessary to know operating priciple of the

floppy disk unit and operational description, including

recording method and format.

5-2. Floppy disk

As various recording methods and formats are used for

floppy disk (F.D.) systems we will discuss some of them

1) Floppy disk nomenclature

Floppy disks called by different names dependng on the

manufacturer

Floppy media (or simply as media)

-|i> Diskette

[ Floppy disk

2) Types of media

Four types are used at present depending on their

storage capacity

J-. Single sided, double density (floppy disk-1)

P’ Double-sided, double density (floppy disk-2D)

3) Components of FD's:

Single Sided media index detect hole

4) Write protect notch

Different write protects are adopted depending on the

drive unit used.

Example-1: In the case of the CE331 the presence of

light reflection is sensed by the photo

coupler and decoded as write protect

Write protected Write enabled

Front side

^— No reflection (Write enable)

Front side 1

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- lReflect>n<t rrsning)

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Sharp MZ-3500 Manuel d'utilisateur Page 47