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FLOPPY DISK INTERFACE

WG

Write

Gate.

Control

signal generated

by

the

FDC. Active state, logic high.

When

active,

enables

current

to flow

into

the

disk drive

read/wri

te

head.

WD

Write

Data.

Output

for

writing

MFM encoded

data

to

the

disk drive.

RAW RD Raw Read.

Input

to

the

FDC for MFM encoded

data from

the

disk drive.

READY

Input

to

the

FDC from

the

disk

drive.

When

set

to logic high, indicates

that

the

selected disk is

ready for

data

transfer operations.

When

set

to

logic low, indicates

that

the

selected disk is

not

available. In

this

condition

attempted

data

transfer operations

between

the

FDC

and

the

disk

drive are inhibited,

and

cause

an

active

interrupt

request

to

be generated

on

INTRQ.

READY also sets

an

associated control

bit

within

an

internal

register according to

the

logic

state

on

the

control line.

TROD

Track

00.

Control

input

from

the

disk drive.

When

TROD

is

set

to

logic low, indicates to

the

FDC

that

the

read/write

head

of

the

selected

drive is positioned over

track

0 of

the

disk.

IP Index Pulse.

Control

input

from

the

disk drive.

A negative going

pulse

generated every

revolution

of

the

disk,

which

informs

the

FDC

of

the

start

of

the

first

sector

of

each

track.

WPRT

Write

Protect.

Control

input

from

the

disk

drive.

When

WPRTis

set

to

logic low,

any

attempted

write

operation to

the

selected drive

is

inhibited.

WPRT also

sets

an

associated

control

bit

within

an

internal

register according

to

the

logic

state

in

the

control

line.

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Other manuals for ACT apricot

Service Manual305 pages