Hi All, does anyone know of a good write up on DMAing to the C64 from the expansion port? I'm sure some of you know the answers without looking them up.... the questions I have are: 1) what memory map does the DMA see? is it the one defined by the 6510 port or are the port lines also Z-stated? 2) if the mem-map is still the 6510 view, then do write throughs to under the ROM still write to RAM 3) how does one DMA to write to the 6510 ports 0x0000 and 0x0001??? 4) can the IRQ /NMI lines be "read" from the expansion port or are they buffered only for generating requests? they look unbuffered to me..... ------------------------------------------------------------------------------------------------ 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 cooperation. 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 are free from computer viruses or other defects. (C) 1999: Orbital Engine Company (Australia) Pty Ltd and its affiliates - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tcm.hut.fi.
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