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
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