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Request For Comments (NIC Board)
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Hi All,
I just sketched out a design for a 4-port Ethernet S-100 card. I likely
won't get around to producing this for a while since I have enough on my
plate to keep me busy for quite some time, but it would be good to start
getting the ball rolling a little bit on something like this.
http://www.8bit.geek/index.php/s100-cards-in-development/nic4-4-port-ethernet-card
In a nutshell, it has an on-board Z/80 that bit-bangs an SPI bus
inter-connecting 4 ENC28J60 MAC/PHY ICs, and the Z80 has 32K of ram to
use as scratchpad and buffer space. The S100 master has access to a 4K
window at the bottom of the Z80s 32K RAM. There is one I/O port for
communicating comamnds and status between the S100 master and teh
on-board Z/80. The Z/80 can interrupt the bus master and interrupt
vector(s) are software programmable.
Welcoming comments.
- --Mike
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