Hello Ruud >IMHO a 8237 is a generic DMA handler on itself. Very >roughly said, the REU >is equivalent to two 8237's plus a refresh mechanism. >Unfortunately the registers don't match :( True, but the 8237 an Intel chip. Brand loyalty aside, the problem is what glue is needed to make it work. Have you got a circuit with it configured as a 65xx bus compatible module. If it takes 5+ chips then one might as well build their own controller... >replacement for it or use something 'simple' like GEOS-RAM. except much faster, point taken though - an REU is much more complicated that a DMA engine, but the VHDL core for DMA transfers could be written in portable way. >64HDD uses a PC-motherboard as core of the desig. It >sounds very logical to >me to use its onboard DMA in the first place. And if you have other >DMA-ideas, I still would use the 8237 as there is enough To access the PC's DMA capability needs either ECP if using an LPT port (for a *blinding* 2.4Mbyte/s) or a PC card. I honestly cannot see too many people plugging a hacker's wirewrapped card into their new 1.3GHz PentiumIV computer (believe me, that's what some people are using to serve data to the C64...). This makes using the on-board features unlikely. - Nick PLEASE TAKE NOTE: The contents of this email (including any attachments) may be privileged and confidential. Any unauthorised use of the contents is expressly prohibited. If you have received this email in error, please advise us immediately (you can contact us by telephone on +61 8 9441 2311 by reverse charge) and then permanently delete this email together with any attachments. We appreciate your co-operation. Whilst Orbital endeavours to take reasonable care to ensure that this email and any attachments are free from viruses or other defects, Orbital does not represent or warrant that such is explicitly the case (C) 2000: Orbital Engine Company (Australia) PTY LTD and its affiliates Message was sent through the cbm-hackers mailing list
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