From: Marko Mäkelä (msmakela_at_cc.hut.fi)
Date: 2002-04-17 11:50:24
On Wed, 17 Apr 2002, groepaz wrote: > think of a system with scpu, AR and REU for example..... How would you access the 8k RAM on the Action Replay and the REU simultaneously? The DMA controller of the REU sits at $dfxx, which is one window to the Action Replay memory. Several years ago, I made a small hardware modification that allowed a REU and an AR to be plugged in simultaneously. I made the REU registers write-only, so that they didn't interfere with the Action Replay, and I think I added a switch for disabling the REU altogether. By enabling 256 bytes of the RAM bank of the Action Replay at $df00-$dfff, I was able to access the REU. Obviously, the AR RAM locations that were "underneath" the REU registers were overwritten. If you are interested in the details, search for "actionreuplay" in the prlink or cbmlink source code. Marko ---------------------------------------------------------------------- To unsubscribe from the list send mail to majordomo_at_musoftware.de with the string "unsubscribe cc65" in the body(!) of the mail.
This archive was generated by hypermail 2.1.3 : 2002-04-17 11:50:35 CEST