MSX SVI-727 User manual

MSX 80 COLUMN VIDEO CARTRIDGE
USERS MANUAL

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WARNING:
SVI-727
USER’S MANUAL
STATEMENT
This equipment generates, uses, and can radiate
radio frequency energy if not installed and
used in accordance with the instruction manual,
may cause interference to radio communications.
lt has been tested and found to comply with the
limits for aClass Bcomputing device pursuant to
subpart Jof Part 15 of FCC Rules, which are
designed to provide reasonable protection against
such interference when operated in acommercia!
environment. Operation of this equipment in a
residential area is likely to cause interference in
which case the user at his own expense will be
required to take whatever measures may be
required to correct the interference.

INTRODUCTION
Published by
SPECTRAVIDEO
INTERNATIONAL LTD.
SV1-727 MSX 80 Column Video Cartridge is
specially for use with the SV1-728 or other MSX
computer. This cartridge allows the users to
switch from 40 column to 80 column display.
With the cartridge, user may run any of the
sophisticated CP/M programs already available
in the market.
Read the instruction manual thoroughly to
become familiar with the 80 Column Video
Cartridge. It is your guide to proper installation
and operation.
First Edition
First Printing 1984
Printed in Hong Kong
Copyright ©1983 by Spectravideo International Ltd.
All rights reserved
Every effort has been made to supply complete and
accurate information in this manual. Spectravideo
International Ltd. reserves the right to change Technical
Specifications and Characteristics at any time without
notice.
No part of this publication may be stored in aretrieval
system, transmitted, or reproduced in any way, including
but not limited to photocopy, magnetic or other record,
without the prior agreement and written permission from
Spectravideo International Ltd.
SV1-727-UM

CONTENTS
SVI-727
MSX 80 COLUMN
VIDEO CARTRIDGE
INSTRUCTION MANUAL
_
END
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Accessories inl cases aGn 4
External VieW aen ins da 5
Main Features 5
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VOASsiGnmegt „aaa esn mer 8
GeNEeRs a10
MERE 10
trouble Shooting Chart 11
Specifications ow sees senses 11

1. ACCESSORIES The package of SV1-727 MSX 80 Column Video
Cartridge should contain the following items:
(A) The 80 Column Video Cartridge you have
purchased
(B) Acable for the connection to amonitor
(C) Instruction Manual
(D) Warranty Registration Card.

2. EXTERNAL
VIEW
3. MAIN
FEATURES
(A)
(B)
(C)
The main feature of SV1-727 80 Column
Video Cartridge allows you to have an 80
Column display instead of a40 column
display on the screen. The display becomes
24 rows by 80 columns.
With the purchase of the SV1-727 together
with your SV1-728 or other MSX computer and
the SVI-707 Disk Drive, you can run any of
the sophisticated CP/M programs already
available in the market.
The cartridge is designed for ease of insertion
and for durability.
(D) Power is supplied by the computer.

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an
4. CONNECTIONS The following is aguide to the proper hook-up
procedures for the SV1-727 80 Column Video
Cartridge.
(A) Be sure all power is OFF” for the computer.
(B) Plug the cartridge gently into game slot at the
top of the computer. Do not force.
Cartridge
Hf
JE
Game
Slot

(C) Be certain the cartridge is fully seated in the
slot and double check all connections.
(D) Connect one end of the video cable to the
socket on the 80 Column Video Cartridge
and the other end to amonitor.
80 Colume Video
5. OPERATIONS The SVI-728 or other MSX computer can only
provide display of 24 rows x40 columns on the
video monitor. However with the installation of
the SV1-727 80 Column Video Cartridge in the
computer and running CP/M diskette,it
automatically defaults to 80 column. It can be
easily shifted back to 40 column display on TV
by typing in
“STAT CON:
and typing in
‘STAT CON:
il CRT:
URI:”
back to the 80 column display on video monitor.

6. I/O ASSIGNMENT
PIN NO.
|
NAME 1-O* PIN NO.
|NAME LO*
1681 o27o
3CS12 o4SLTSL 0
5N.C. =6RFSH o
7WAIT |8INT |
9MI o10 BUSDIR |
11 IOROQ o12 MERQ o
13 WR o14 RD o
15 RESET o16 N.C -
17 A9 o18 A15 o
19 A11 o20 A10 o
21 A7 o22 A6 o
23 A12 o24 A8 o
25 A14 o26 A13 o
27 A1 o28 AO o
29 A3 o30 A2 o
31 A5 o32 A4 o
33 D1 I/O 34 DO I/O
35 D3 I/O 36 D2 I/O
37 D5 I/O 38 D4 I/O
39 D7 I/O 40 D6 I/O
41 GND Ei 42 CLOCK o
43 GND =44 SWI ==
45 +5V ii 46 SW2 E
47 +5V =48 +12V e=
49 SUNDIN |50 AV -.
*The 1/O is based on the computer.

oe]
SIGNAL PIN ILLUSTRATION
PIN NO.
|
NAME DESCRIPTION
1GS ROM 400077FFF selected signal
2657 ROM 8000-BFFF selected signal
3GS.12 ROM 4000>BFFF selected signal
4SLTSL Slot selected signal. Fixed select signal for
jeach slot.
5NC. Not connected.
6RFSH Refresh signal.
7WAIT Wait signal to CPU.
8INT Interrupt request signal.
9MT Fetch cycle signal of CPU
10 BUSDIR This signal controlls the direction of
external data bus buffer when the cartridge
is selected. It is low level when the data is
sent by the cartridge.
11 IORO 1/O request signal.
12 MERO Memory request signal.
13 WR Write signal.
14 RD |Read signal.
15 RESET, System reset signal.
16 N.C. Not connected.
17532 AO>A15 Address bus.
33-40 DO-D7 Data bus.
41 GND Ground
42 CLOCK CPU clock 3579 MHz
43 GND Ground
44, 46 SW1, SW2
|
Insert/remove protect
45, 47 +5V +5V power supply
48 +12V +12 power supply
49 SUNDIN Sound input (—5dbm)
50 —12V —12V power supply

7. CAUTIONS
8. MAINTENANCE
10
Proper cautions should be observed when handling
the SV1I-727 80 Column Video Cartridge and al!
other interface.
(A) Never remove or insert a80 Column Video
Cartridge or any peripheral cartridge with
the power ON”. This could cause serious
damage to your system.
(B) Never remove the protective casing
surrounding the printed circuit board.
(C) Never bang or drop the cartridge. This could
cause irreparable damage to its circuit board.
The performance of preventive maintenance on
any peripheral cartridge is essential to the life of
the cartridge. The following is adescription of
preventive maintenance you may perform on
your 80 Column Video Cartridge.
(A) Use acleaning solvent, preferably freon
based, to clean the bus fingers located at the
bottom of the card.
(B) The use of awire brush is also
recommended when cleaning bus fingers.
(C) Never smoke, eat or drink anything near the
cartridge. Particles of food and dust can
get lodged in the printed circuit board,
affecting performance and perhaps causing
damage.

FE
ERE
9. TROUBLE SHOOTING CHART
Please disconnect the cartridge from the computer and check whether
the computer can function properly.
SYMPTON
80 Column
not displayed
No display
No steady
display
POSSIBLE CAUSE
Improper connection
of the cartridge
Loose video cable
Low brightness and
contrast on monitor
Improper tuning of
the horizontal centering
and vertical hold
REMEDY
Make sure power is
OFF, Plug the
cartridge firmly into
the game slot at the
top of the computer.
Make sure the video
cable is properly
connected to the
monitor and the
cartridge.
Adjust the brightness
and contrast level,
Adjust the horizontal
centering and
vertical held.
10. SPECIFICATIONS Character: 7x9dot matrix
Characters (column &row) Total:
80 x24
Display characters: 128 ASCII characters
Video output: composite video 2Vp-p
U

PRINTED IN HONG KONG

©1984 SPECTRAVIDEO INTERNATIONAL LTD.