Which end is "up"?

[Cassidy Nolen]

Hi all,

 

Have a question about the ROM for a 2600 game. If you were to use a jump to byte 0200 command, which end of the game rom would you put it on? I tried putting the command A4 00 02 in the locations 00 01 02, but it did not do what I wanted it to.

 

Does it need to go at the other end, like 0FFF, and backwards? I really have been trying to understand the assembly language; just not clear where the Atari starts "reading".

 

Thanks all. I will really try not to ask more stupid questions than necessary....

 

Cassidy

 

 

BTW, where do I sign up for Stella's List?

[Paul Slocum]

When you boot the Atari, it reads the word at $0FFC and loads that word into the program counter. So you tell it where to start reading.

 

	org $0FFC



dc.w $0000 ;  For example, tell it to start at $0000



dc.w $0000 ;  Fill in two more bytes to make it a full 4K

                                ;  ( I believe this is also the interrupt vector )

 

-Paul

[Thomas Jentzsch]

BTW, where do I sign up for Stella's List?

http://www.biglist.com/lists/stella