greg (11/17/82)
Here at isrnix, we are running a CDC 9766 300mb drive on our 11/44 with a System Industries 6100 controller. There is a switch on the controller that controls how data will be transfered during DMA operations (it's called the DMA throttle count switch). There are 3 DMA options, one is a burst rate of 2 words per NP request, one is a burst rate until SACK, whereby the controller will relinquish the bus to a higher priority reqest, and the other option is "Throttle at microprogram control". My question is (finally!): "What exactly does this mean?" The manual says nothing more about microprogram control. Currently we are running at a burst rate of 2 words per NP request with no problems. Has anyone experimented with this switch? We also have a (yeeech) RL11 controller that is badly buffered, so I need to make sure the 6100 doesnt hog the bus, but I would like to get the highest possible transfer rate out of the bugger. Any thoughts/experience on the matter? Thanks, Greg Travis decvax!pur-ee!isrnix!greg