Hello Ruud, >> needs either ECP >I never have thought about using this for DMA :( What does one need to be >able to use it for DMA-ing with a C64? ECP seems to be a fairly complicated mode and the speed improvement is not that much higher than the EPP mode. The EPP mode automates the hand shaking lines and the receiver can easily meet the specification using simple TTL and a few delays (even the the 8255 comes close). There are two "buffers" one 1byte (address) and the other 4bytes (4x 8bit data). Hence you can send 4 8bit bytes per I/O write. The ECP uses similar signal timings, but the problem is where the device must request service from the PC. The DMA mode allows a section of PC RAM to be configured as "send this to the device", and after this there is no further need to control the I/O card. I've been told though that like PCI, the device needs a special LSI in order to handle it. That's about the extent of my knowledge - perhaps someone knows more. It seems a very interesting way to do things, if it wasn't for needing the LSI... 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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