From: Gideon Zweijtzer (gideonz_at_dds.nl)
Date: 2002-05-02 12:49:53
Ruud wrote: |Don't know DPRAM well enough: can one system read/write data from one port |when the other system is reading from it? If not then we have the same time |problem. Yes, that's why it's called Dual Port. These chips have two complete access ports (Address/Data/Control) to the same memory array. |If yes, my second thougt, especially for Gideon: when using DPRAM, we still |need the MMU mechanism. So is the effort, using DPRAM, worth the gain in |speed? On the C=64: Yes! The system memory IS also the video-memory, and the bandwidth is only 1 MB/s. Although we only need to do the writes, it is still very little and this might be a big (narrow?) bottleneck. On the C=1: No, or at best very little. Jeri provided fifo's (write buffers) for writes to the video-memory. And, of course the bandwidth on that platform is a lot higher. Gideon Message was sent through the cbm-hackers mailing list
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