[time-nuts] GPS for Nixie Clock
hmurray at megapathdsl.net
Tue Jul 12 16:21:20 EDT 2016
time at patoka.org said:
> In addition, even MCU has not enough resources to handle TCP/IP, DHCP and
> NTP, it is some solutions available to outsource it to dedicated chips. I
> was using WIZ5100 (assembled as a modules) with great success.
NTP is pretty simple. If you are willing to take a few shortcuts, things get even simpler. If you have a NTP server on your LAN, you can skip routing and DHCP by broadcasting a request. It would be interesting to see how small you could make a set-the-time package.
The Xerox Alto had an Ethernet boot loader in microcode. (and space in the microcode ROM was tight) When bringing up a new machine, we figured out that it was much simpler and faster to debug the Ethernet before the disk controller. The debugger worked over the Ethernet. That gave you a solid place to stand early in the debugging process.
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