1 Picture Mosaic

12 IS CHIP SELECT WORKING PROPERLY? IS THE ADDRESS DATA BUS NORMAL?

3 ARE THE INPUT/OUTPUT POWER OF DECODE NORMAL? FOR 6 PIN, CHECK ON 4, 5 PIN OF IC 30.

2. THE SCREEN IS SHOWN HORIZONTALLY DOUBLED & TRIPLED.

o V RAM OF MUX - SURROUNDING (CIRCUMFERENCE)

IC 76, 87, 97, 98, 99 o CHARACTER ROM - SURROUNDING (CIRCUMFERENCE)

3. THE SCREEN IS SHOWN VERTICALLY DOUBLED, TRIPLED ETC.

o INVERSION FAULTY IC 70, 80

4. WORDS APPEAR ON SCREEN.

5. INVERSION FAULTY OF WORDS FOR 2 PLAYERS.

6. OFF-POSITIONING OF CHARACTER OR WHEN CHARACTER (SUCH AS FROGS) DO NOT APPEAR.

o ADDRESS BUS WORKING FROM OBJ-RAM TO TTL ROM FAULTY. IC 37, 47, 48, 49.

7. CHARACTER TURNS INTO NUMBER.

o ADDRESS COUNTER OF TTL RAM FAULTY. IC 37, 49.

8. TURNS INTO MOSAIC AT TIMES WHEN SHIFTING THE CHARACTERS.

o FAULTY OF DATA SELECTOR INSERTED IN CHARACTER ROM. IC 88, 89, 90.

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