Date: 2002-05-02 08:19:55
>|Memory accesses (at least selected ones) need also go to the original >|address/data bus elsewise the VIC chip will not see anything to display? >program it in the MMU for which pages this applies (Note that on the C-64, >the bus bandwidth to memory is only 1 MB/s!! Fortunately, this is a lot But why limit ourselves to this? 1MB/s applies to most I/O chips on the C64 Bus and to boards with 300ns access RAMs, 300ns also for the 2114 colour RAM. The 4164 DRAMs can readily be replaced with 100ns 41256s, thus with perhaps a jumper (for enable /disable, or config register/poke) you should be able to squeaze several writes in the valid 500ns ==> 2MB/s, 3MB/s or 4MB/s. - 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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