Hello Ruud, >but...). I don't see any reason why it should not work for a >360KB floppy, >for the 1.44 I have my doubts. A 1.44Mb floppy interface using DMA has been done by a guy in Hungry... http://www.fesb.hr/~btrumbic/c64diskTR20.htm I think the point I was making if that IOCKRDY halts the 80x86 CPU, which is fine.... but my understanding was that the DMA ops on a PC also use this line to tri-state out the CPU and allow mem-to-IO transfers. In the PC case the 8237 does the data interchange. But if you DMA the C64 by connecting it to this wire, who would control the data on the bus without addition DMA control functions? If the 6510 remains is to remain in control then this limits to control to PIO functionality. I have another question for you though... I've often thought about the issues of connecting a VGA card for example to a C64 using such a PC card you describe. For this though there is both IOR and IOW control needed for the control registers and MEMR and MEMW for actualing putting data on the RAM. How do you know that read/writes to the RAM won't clash with the VGA controllers accesses? - 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 - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
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