Megatel Quark/100 Specifications download pdf (Page 64)

TABLE

1/0

ADDRESSES

AND

FUNCTIONS

FOR

THE

QUARK

(CONTINUED)

1/0

DEVICE

ADDRESS

FUNCTION

(READ

WRITE)

--------------------------------,--------------------------------------------

7A-7F

84-8F

91-97

PIA

DDRA

CRA

DDRB

CRB

ACIA

SR/CR

RDRITDR

I/O

ias

FDC

STR/CR

I/O

alias

LAN

STS/CMD

(Ql200

only)

I/O

alias

Peripheral

reg

A or data direction

reg

-PAO-7:

8-bit

encoded

keyboard

input or

general-purpose

1/0

lines

Control register A

-CA1:

Vertical

Sync

interrupt input

-CA2:

External interrupt input, or

keyboard

strobe, or bell output

Peripheral

reg

data direction

reg

-PB0-2:

Floppy

Disk

SEL

0-2 outputs(act. high)

-PB3:

Floppy

Disk

SEL

3/LOW

CURRENTCact.

high)

-PB4:

Floppy

Disk

SIDE

select

output

----

-PBS:

Floppy

Disk

SNGL/DBLE

select

Chigh=SNGL)

-PB6:

GRAPHICS/ALPHA

mode

bit

(high=ALPHA)

-PB7:

Full-duplex port

DTR

output (active

low)

Cont

rol

reg

ster

'----.-.i"

•

-CB1:

Floppy

Disk

Controller

INTERRUPT

REQUEST

<E-

~vT~}t:(

!2t?zP

-CB2:

Boot

Mode:

low

normal

operation

high=

PROM

selected,

RAM

deselecte~

1()

- -

12.

I 7;//

fW<.,

{/v

LJ~l

Status register / Control register

Receive

data register / Transmit data

-VIA

Timer

sets

baud

rate

transmitter

and

receiver

under

non-spLit

baud

rates,

receiver-onLy

under

split

baud

rates

-VIA

Timer

sets

transmitter

baud

rate under

spl

baud

rates

Not

recommended

for

use

Status register / Control register

in~tJ

-FDC

interrupts are sent

PIA

CB1

Track

Sector register

Data

------

Not

recommended

for

use

----_

Local-area

network

status/command

-stat

reg

bit

LAN

READY

flag (active high)

-control

block

address for

Omninet

interface

-------------

Not

recommended

for use.

5'J

d~/--e.

t?L.--J

f#7

)

~;Jf

Megatel

Computer

TechnoLogies

Toronto,

Canada

Appendix

Page

A-3

1 2 ... 59 60 61 62 63 64 65 66 67 68 69 ... 85 86

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Megatel Quark/100 Specifications Page 64

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