Sega Mega-CD - How to Use Check Cartridge and Check CD; Cause of Error in each Check Item; Boot ROM Read Check; Program RAM R;W Check

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MEGA~CD

SOFT

CHECK

MANUAL

+

HOW

TO

USE

"CHECK

CARTRIDGE

AND

"CHECK

CD"

*

CARE

HAS

TO

BE

TAKEN

THAT

IF

THIS

CHECK

IS

PERFORMED,

THE

DATA

OF

THE

BACKUP

RAM

ARE

ERASED

OR

REWRITTEN.

1.

Make

sure

that

the

power

is

turned

off

beforehand

and

then

install

a Mega

Drive

on

the

MEGA-CD

to

be

checked.

2.

Connect

the

Joypad

to

the

Control

No.1

of

the

Mega

Drive

3.

Install

the

check

cartridge

on

the

cartridge

connector

of

the

Mega

Drive.

4.

Turn

the

switch

of

the

Mega

Drive

on.

5.

Checking

starts

when

the

START

button

of

the

Joypad

is

pressed.

6.

The

tray

opens

during

the

checking.

Install

the

check

CD.

7.

If

the

checking

is

completed,

the

tray

opens

again.

Remove

the

check

CD.

+

CAUSE

OF

ERROR

IN

EACH

CHECK

ITEM

*

MEGA-CD

INTERFACE

PART

1.

Boot

ROM

Read

check

Read

the

boot

ROM

(IC4)

in

the

MEGA-CD

from

the

Mega

Drive

and

check

if

it

is

in

the

normal

conditions.

Cause

of

Error:

Connector

board

(Connector

pin

contamination,

IC

defect,

pattern

disconnection

etc.),

Boot

ROM

defect

(IC4),

etc.

•

If

the

boot

ROM

is

EPR-14088A

(Version

A),

it

always

resul~s

in

error.

The

software

itself

of

this

boot

ROM

has

many

bugs;

therefore

replace

it

with

the

latest

ROM.

2.

Program

RAM

R/W

check

Perform

R/W

onto

the

program

RAM

(IC5

to

ICB)

and

check

if

the

access

to

the

RAM

is

normal.

Cause

of

Error:

Defect

of

IC5

to

ICB,

pattern

disconnection,

surroundings

of

GA

(IC2)

etc.

1