Re[2]: [cc65] 65816

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From: groepaz (groepaz_at_gmx.net)
Date: 2002-04-17 12:01:36


Hello Marko,

Wednesday, April 17, 2002, 11:50:24 AM, you wrote:

MM> On Wed, 17 Apr 2002, groepaz wrote:

>> think of a system with scpu, AR and REU for example.....

MM> How would you access the 8k RAM on the Action Replay and the REU
MM> simultaneously?  The DMA controller of the REU sits at $dfxx, which is one
MM> window to the Action Replay memory.  Several years ago, I made a small
MM> hardware modification that allowed a REU and an AR to be plugged in
MM> simultaneously.  I made the REU registers write-only, so that they didn't
MM> interfere with the Action Replay, and I think I added a switch for
MM> disabling the REU altogether.  By enabling 256 bytes of the RAM bank of
MM> the Action Replay at $df00-$dfff, I was able to access the REU.
MM> Obviously, the AR RAM locations that were "underneath" the REU registers
MM> were overwritten.  If you are interested in the details, search for
MM> "actionreuplay" in the prlink or cbmlink source code.

oh yes you are right :o) i was thinking of the retroreplay anyway
(which works fine together with a reu)... however, as far as i know
the incompatibility isnt actually hardware-related (as in, the 32k
rr-image used in an AR should work with a reu aswell..... dunno for
sure though) .... maybe  theres some info at ar.c64.org or sth

-- 
Best regards,
 groepaz                            mailto:groepaz_at_gmx.net


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