ICD Ramblo XL Installation And Operation Manual - page 12

Chapter 3-Installation for 800XL  

Locate Important Integrated Circuits (800XL) 

ANTIC - U7  Also labeled either C012296 or C021697. This is the 

second 40 pin IC from the left at the front of the PCB. The part 

number of this IC determines whether you connect a jumper wire 

to point 'C' (or not) on RAMBO XL and also how you set JP3. 

PIA - U23  Also labeled C014795 or 6520. This is located two ICs to 

the right of ANTIC in the 800XL. This should be socketed since we 

will need to bend up five pins and solder the ribbon cable to them. 

Memory Decoder IC we are replacing  - U27  Also labeled 74LS158. 

This is a 16 pin IC. U27 is to the left of ANTIC and several ICs 

above it. If this IC is soldered directly to the PCB (without a socket) 

then you must carefully unsolder it and replace it with a 16 pin 

socket. 

RAM Chips - the 800XL has them labeled U9-U16 and they are  

along the left hand side of the PCB. These should all be in sockets. 

If not, you must unsolder these ICs and replace them with sockets.  

Check Jumpers and Jumper Block Settings on the RAMBO XL  

Board 

See the following table (table 1) to determine which jumpers you  

need to run and how to set the jumper blocks for your computer. 

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