>By the way, how is RAM within a cart able to be used, since there is no R/W
>line on the cart port - I imagine some convoluted thing writing to 'magic'
>addresses.
That depends on how the RAM has been implemented in hardware. Atari's
Superchip RAM for example uses seperated addresse for read and write.
You would write to $F005 and read from $F085 in the 128 byte Superchip.
Supercharger RAM is a bit more difficult to write to. First you have to
enable writing by writing the right value to the control byte at $FFF8.
Then you can access address $F000+X, where X is the value to be stored.
You have to access the address to be written to at a given number of
processorcycles after the access to $F000+X.
For more info on the Supercharger you can check out Christopher Salomon's
text on Nick Bensema's Atari page at
http://www.primenet.com/~nickb/atariprg.htm
Ciao, Eckhard Stolberg
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