Pioneer PX-7 Bedienungsanleitung

($ PIONEER

Service

cTVIanual

CIRCUIT &MECHANISM

DESCRIPTIONS

REPAIR & ADJUSTMENTS

ORDER NO.

ARP-683-0

PERSONAL COMPUTER

MODEL PX-7 COMES IIM TWO VERSIONS DISTINGUISHED AS FOLLOWS:

Type

Voltage

AC220V, 240V (switchable)

AC240V, 220V (switchable)

Remarks

European continent model

United Kingdom model

RF OUTPUT

G/PALUHF 36 ±1ch

l/PAL UHF 36 ±1ch

•This service manual is applicable to the HE and HB types.

CONTENTS

1. SPECIFICATIONS 2

2. PANEL FACILITIES 12

3. DISASSEMBLY 21

4. PARTS LOCATIONS 23

5. EXPLODED VIEWS AND PARTS LIST 25

6. PACKING 28

7. CONNECTION DIAGRAM 29

8. SCHEMATIC AND P.C. BOARDS

CONNECTION DIAGRAM 31

ELECTRICAL PARTS LIST 44

10. ADJUSTMENTS 48

11. INSPECTION ROM INSTRUCTION

MANUAL 53

12. BLOCK DIAGRAM 69

13. CIRCUIT DESCRIPTION 73

PIONEER ELECTRONIC CORPORATION 4-i. Meguro i-Chome, Meguro-ku, Tokyo 153. Japs

PIONEER ELECTRONICS [USA] INC. P.O. Box 1760. Long Beach. California 90B01 USA.

TEL: [BOO] A21-1AOA, [BOO) 237-OA24

PIONEER ELECTRONIC [EUROPE] N.V. Keetberglaan 1. 27AO Beveren. Belgium TEL: 03/775 20 08

PIONEER ELECTRONICS AUSTRALIA PTY. LTD. 178-1 BA Boundary Road. Braeside. Victoria 3195. Austral

TEL: [03) 5BO-9S11 FZ ©OCT. 1985 Printed in J;

PX-7

1. SPECIFICATIONS

CPU 8-bit Z80A (3.58 MHz clock)

Memory RAM 48K (including 16K video RAM)

ROM 40K (32K MSX BASIC, 8K P-BASIC)

Display Text SCREEN 0: 40 X24 (default 37 x24)

SCREEN 1: 32 x24 (default 29 x24)

Graphics

resolution 256 x192 dots

Colors 16 colors

Sprites 256 sprites

Output PAL composite video output (16 colours)

lVp-p/75 fi

RGB output (8 colors), TTL level

HB model: I/PAL/RF output (16 colors

with sound)

HE model: G/PAL/RF output (16 colors

with sound)

UHF 36 ±1ch, 74 dB/tV/75 0

Screen control Computer mode

Superimpose mode

External video mode

Keyboard Type Separate type, full stroke, 76 keys

Cylindrical step sculptured key tops

Facilities Alphanumeric: 48 keys

Control: 20 keys (with 4cursor keys)

Function: 5keys (10 functions selectable)

Screen mode control: 3keys

Cable 1.5 mwith 13-pin DIN plug

Sound Source 3voice (8 octaves +1noise, 8~

envelopes) C°T“;

Ivoice (key click sound) }sound

External stereo audio input signals

150 mV/50 kfi

Output Internal speakers (stereo)

Headphones (stereo)

Line output (stereo), 150 mV/1 kfi

Mixing control Computer sound mixing level control ±15 dB

Master volume control

Externa! sound muting control

Interface System control Laser Vision Player, component display,

audio system remote control ports

Cassette recorder Baud rate: 1200/2400 baud (software select)

FSK signal

Printer Centronics standard, 8-bit parallel port

Controller Ports for 2joysticks, tablets, paddles,

trackballs, etc.

Cartridge 2MSX cartridge slots (slots #1and #3)

Power requirements 220/240 V±10%, 50/60 Hz,

Power consumption: 37 W

Operating temperature 5—35 deg.C

Dimensions Main unit: 420 (W)x 323.5 (D)x70 (H) mm

Keyboard: 420 (W)x 171 (D)x47.5 (H) mm

Accessories •Warranty card

•RF cable (2 m)

•Instruction manual

•BASIC reference manual

•P-BASIC reference manual

1.2 BLOCK DIAGRAM

1. 3MEMORY MAP

Hexadecimal addresses

0000|

User

area

MSX BASIC

ROM

Program area

(text area)

Variable area

Array variable area

Character string area

File control block

«Area in which programs with line

Inumbers are stored.

pVariable area

With character variables, the pointers

(string descriptors) to the character

strings provided are stored in this area.

•Array variable area

If the array variables are character

types, the pointers to the character

strings provided in the character string

area are stored in this area. The area

itself is secured when DIM statements

eexecuted or when arrays with 10 or

less accompanying characters are used.

•The free area is not used. Its size is

'determined by subtracting the stack

area, variable area and program area

from the user area. It can be sought by

the FRE function.

•Stack area in which BASIC returns and

addresses are saved when FOR-NEXT

>r GOSUB statements are executed.

fArea in which character strings includ-

ed in the character variables and array

variables are stored. The size of this

area is the size designated by the

CLEAR statement. An area of 200

bytes is secured if there is no designa-

tion with the CLEAR statement.

Area used with file input/output. It is

secured in line with the number

designated by the MAX FILES

statement.

»The upper limit address can be set to

F380 or less by CLEAR and so it is

possible to provide an area separate

from the work area which the user can

use freely for machine language

routines, etc.

>Area in which BASIC is used.

PX-7 Memory Configuration

Address Slot #0 Slot #1 Slot #2 Slot #3

Expansion

I/O register

Expansion

slot

(rear of unit)

1.4 I/O MAP

(1) I/O address allocation

RW Details Remarks

&H98 WData write into TMS9129NL

VRAM or

RData read from equivalent

VRAM

&H99 WCommand, address set

RStatus read

&HA0 WAddress latch AY-3-8910

&HA1 WData write or

&HA2 RData read equivalent

&HA8 WPort Adata write 8255A or

RPort Adata read equivalent

&HA9 WPort Bdata write

RPort Bdata read

&HAA WPort Cdata write

RPort Cdata read

&HAB WMode set

&H90 WStrobe output (bO) latch output

RStatus input (bl) “1” is

BUSY

&H91 WPrint data latch output

I/O addresses from 80 to FF area prescribed as

above for system use. Empty columns are system

reserves.

*1/0 addresses marked with an asterisk are for

optional equipment.

(2) PPI bit allocation

Port Bit Input/

output Signal Details

A0CSOL Slot designation number of ad-

dresses

1CSOH 0000 to 3FFF

2CS1L Slot designation number of ad-

dresses

3Ou put CS1H 4000 to 7FFF

4CS2L Slot designation number of ad-

dresses

5CS2H 8000 to BFFF

6CS3L Slot designation number of ad-

dresses

7CS3H C000 to FFFF

Infut Keyboard return signal

C0KBO

2KB2 Keyboard scan signals

3Output KB3

4CASON Cassette control (L-ON)

5CASW Cassette write signal

6CAPS CAPS lamp signal (lights when low)

7SOUND Sound output based on software

(3) PSG bit allocation

Port Bit Input/

output Connector pin no. Signal when

joystick used

A0CONTROLLER 1-1 pin *1 FWD1

CONTROLLER 2-1 pin *2 FWD2

1CONTROLLER- 1-2 pin *1 BACK1

CONTROLLER 2-2 pin *2 BACK2

2CONTROLLER 1-3 pin *1 LEFT1

CONTROLLER 2-3 pin *2 LEFT2

3CONTROLLER 1-4 pin *1 RIGHTI

Input CONTROLLER 2-4 pin *2 RIGHT2

4CONTROLLER 1-6 pin *1 TRGA1

CONTROLLER 2-6 pin *2 TRGA2

5CONTROLLER 1-7 pin »1 TRGB1

CONTROLLER 2-7 pin *2 TRGB2

7CASR (cassette tape read)

B 0 CONTROLLER 1-6 pin *3

2CONTROLLER 2-6 pin *3 >High level

3Out >ut CONTROLLER 2-7 pin *3

4CONTROLLER 1-8 —

5CONTROLLER 2-8 -

6Port Ainput select

*1: Effective when port Bbit 6is low. For CONTROLLER 1

*2: Effective when port Bbit 6is high. For CONTROLLER 2

*3: Set high when the port is not used as an output port.

(4) Expansion I/O registers (slot #2)

LCON register <7FFE (16)>

Bit RW Signal Function

RACK Significant with acknowledge 1-»0

with respect to remote control signal

transmission

RRMCLOK Clock produced by dividing

CLK1/CLK2 frequency by 128

WREM High output with bit serial data out-

put generated in synchronization with

RMCLK

VCON register <7FFF (16)>

Bit RW Signal Function

REXTV Status indicating availability of exter-

nal video signal. Low when available;

high when not available.

WMute Line input signal muting

-^====;

R INTEXV Interrupt available with interrupt flag

1when external video signal is OFF.

Set to 0when read.

WOVERLAY Hardware selection signal of superim-

pose/non-superimpose mode; 0for

superimpose, 1for non-superimpose

1.5 CONNECTOR

(1) System control output 1

®vpRVOVLY (OUT)

©-^ yLEXTREMO(OUT)

Stereo mini-jack

(3) System control output 2

®vp©CREMO(OUT)

(?)

—

-U GND

(2) System control input

RSELECT I(IN)

LEXTREMI(IN)

Stereo mini-jack

®vri

©-^ y

(4)

System control output 3

Pin No. Signal I/O

1SELECTO o

4LACK I

7LREMO o

(5)

RGB connector

Horseshoe-shaped

8-pin DIN connector

Pin No. Signal Logical

porality

2GND

4Horizontal sync

signal Negative

5Vertical sync

signal Negative

6RED Positive

7GREEN Positive

8BLUE Positive

Round 8-pin DIN connector

(6)

Cassette interface connector

‘INPUT or OUTPUT based on unit.

(7) Keyboard interface connector

Pin No. Signal I/O

1D6 I

2D5 I

3D2 I/O

4D1 I/O

5D7 I

6D3 I

7D4 I/O

8DO I/O

9+5V

10 STB 0

11 GND

12 CAPS 0

13 GND

(8) Printer connector

Pin No. Signal I/O

1PSTB 0

2PDBO o

3PDB1 0

4PDB2 o

5PDB3 o

6PDB4 0

7PDB5 o

8PDB6 o

9PDB7 o

10 NC

11 BUSY I

12 NC

13 NC

14 GND

Round 13-pin connector

Amphenol 14-pin connector

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