Subject: Re: [stella] Multiloads From: Eckhard Stolberg <Eckhard_Stolberg@xxxxxxxxxxxxxxxxxxxxx> Date: Tue, 21 Oct 1997 14:19:33 +0200 |
>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 -- Archives updated once/day at http://www.biglist.com/lists/stella/archives/ Unsubscribing and other info at http://www.biglist.com/lists/stella/stella.html
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