> On 2018-06-13, at 19:53, Jim Brain <brain@jbrain.com> wrote: > > implement if the 64 requests the transfer. The issue, as I understand > it, is if you want to surreptitiously DMA data into the running 64 > memory map, since you don't know where the 6510 is in it's instruction > fetch/decode/action cycle, and pulling DMA low will corrupt CPU > activities in flight. Roger that. I am about something a litte different though. Something like: the CPU puts some data into a buffer and goes about its other businesses. Once it returns it finds the data processed by a DMA capable circuit that reads the data left by the 6502/6510, processes it and writes back to the same (or another) RAM area. All that without actually stopping the CPU. I heard there were some DMA implementations that worked in such way. -- SD! - http://e4aws.silverdr.com/Received on 2018-06-14 01:00:04
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