ICD Ramblo XL Installation And Operation Manual - page 15

Chapter  4-Installation for 1200XL 

CHAPTER 4-INSTALLATION FOR 1200XL  

Turn your computer on its back. Remove the six phillips head   

screws which hold the case together and place them in your parts  

dish. Turn the computer right side up and lift the top cover up and  

towards the front. Look inside and find the two ribbon cables  

which connect the keyboard and console LEDs to the main   

computer board. Carefully unplug these cables noting the correct  

polarity of their connectors. Remove the keyboard assembly and   

set it aside for now. 

Remove the six phillips head screws holding the computer board in   

the bottom case. One of these screws is in the upper left hand   

corner near the on/off switch. Another is in the upper right corner   

and goes through the heat sink. The remaining four screws are   

across the front and about four inches apart. (Three of these also   

hold down the metal shield.) 

Remove the computer board assembly from the case. Lift the front  

of the computer board and the cartridge/joystick/switch assembly  

up and pull the computer board out and towards you until all the   

rear connectors are free. Remove this assembly, separate the   

plastic piece from the PCB and set it aside. 

Remove the metal shields and set them aside. There should be   

several "push" rivets. Remove these then separate and remove the   

metal covers. NOTE: Some metal covers are held together with   

bent metal tabs instead of screws. These tabs should be   

straightened with your needle nose pliers. Then the shields may be  

separated. 

Locate Important Integrated Circuits (1200XL) 

ANTIC-U20 

Usually will be part number C012296. This is the 40   

pin IC to the lower right of the PCB. 

PIA-U23  Also labeled C014795 or 6520. This is located just 

to the left of ANTIC in the 1200XL. 

9