[Coco] CocoNIC

Brett Gordon beretta42 at gmail.com
Sat Sep 24 16:11:07 EDT 2016

>      o For everyone's reference, to convert from 65/68XX signalling to
>        Intel/ISA, here are the equations:
>          + assign _iow =              !(ce_nic & !r_w & e);
>          + assign _ior =              !(ce_nic & r_w & e);
>          + gating with E is important on both read and write

Thanks for sharing that.  I believe its important to our small community
that nuggets of helpful info are free and open.  So from the little I
understand of hardware, it looks as if ISA busses have a separate read and
write lines, where the m6809 has one?

>  * I added code to soft-hide/unhide NIC from address space :-) (Barry
>    Nelson's idea, for the CocoFlash, but I added it here as well)
>  * I added Verilog to allow soft base address relocation.
>  * I added a config item to allow 2 NIC cards in one system (router,
>    anyone) :-)

All nice features.  Not sure about a coco router, though, I'm guessing the
code for such would actually be easier than a full tcp/ip stack :)


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