Sharp mz-800 Instrukcja Obsługi Pobierz pdf (Strona 28)

MZ-800

4-2-10.

ROM

configuration

The MZ-700

monitor,

character generator (eG), MZ-800

monitor, and

IPL

are

implemented

on a single chip

16k x 8-bit ROM.

ROM add

....

soooo

$1000

$2000

$3000

$3FFF

,..-------.

$0000

MZ-700

monitor

~----~

$1000

MZ-800

IPL

monitor

4-3. 8255

Programmable

Peripheral Interface

The 8255 has three pairs

8-bit lID ports, each one can

assigned

input

output

port

by means

programming. A different

mapping

is established de-

Port name (address) Pin No.

110

Active state

PAo

PA,

PA2

( 700

$EOOO

)

PA3

800

$DO

PA. L

PAs

PA7

PBo

PB,

PB2

( 700

$EOOl

)

PB3

800

$Dl

PB.

PBs

PB.

PB7

1-------

PCo

0 L

PC,

INOTE-'I

PC2

( 700 $E002 )

PC3

~TE-21

800 $D2

Pc.

I H

PCs

PC.

PC7

( 700 $E003 )

-- --

800 $D3

NOTE-l:

Output

data

dependent

the

bit

set

mode.

Mapping

address

Not

used

QD-IOCS

IPL

monitor

command

BASIC

10CS

Version

$Eooo

$E010

$ESOO

(start address)

$F400

$FFFO

SFFFF

pending on the mode. In the MZ-700 mode, it is {In

memory

space, and in the MZ-800 mode, it is on lID

space.

Function

}Keyb~'d

~'"

"mbe

Joystick-l

strobe

Joystick-2

strobe

CRT

cursor

blink

timer

reset

Keyboard scan

input

Prohibits

sound

output

the

8253

Cassette

write

data

Disables

timer

interrupt

Rotates

the

cassette

motor

Checks

the

cassette

motor

Cassette read data

CRT

cursor

blink

timer

input

Vertical

blink

signal

Control

port

NOTE-2:

Motor

controlled

and

off

the rising edge

the

signal.

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 70 71

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