Uthernet II update

Sorry folks … been a long time coming but an update is finally here.

About a year ago I was sending out first alpha, then beta versions of the new Uthernet II card. As I had done most of my testing in a IIgs Rom1 and an enhanced IIe, I was dismayed to find out that the card was not working properly in a unenhanced IIe or in most IIgs ROM3’s.There were two issues 1) the timing was off and there were intermittent problems and the interrupt line caused issues in the IIgs with the control panel activation sequence.

With Kilian Leonhardt and Daniel Krue’s suggestions I was able to update the circuit so that both of these problems are no longer an issue based on the testing both Kilian and I have done. So I made modifications to the PCB and just today received some new boards. Later this week I will be cooking up a few and then will proceed with the final testing.



After that if all goes well, I plan to send out a small survey with a few questions and then we can proceed with taking pre-orders.



Beta run

The next revision of the PCB boards are on their way to me now. Parts to be ordered soon. Should have cards ready for the beta testers hopefully the end of next week. Wanted to give a shout out to David Finnigan of  for the Uthernet II logo gracing our home page.

Next Rev

SketchUp rendered rev2 board


Update #2

Hi I have a working board now but I realized I will need to spin another PCB before sending out a broader beta testing run.

The current PCB needs an inverter due to the way I hooked the LVCC4245 to the apple II bus. Once I added that I also found the LVCC4245 had some timing issues in the IIgs.

Replacing the LVCC4245 with a standard 74LS245D seems to work okay so far.

My first real world test other then web browsing was to use Contiki to participate in the IRC server on the other night.


I thought perhaps some folks might like to see my hardware progression from Uthernet I to Uthernet II (after the decision was made to finalize on W5100 vs the other contenders).

So from left to right we have (1) the original Uthernet, then we have (2) a custom bridge adapter that let me use the WIZ811MJ module with the original Uthernet base board, then we have (3) PCB version of that adapter (while this works fine there are clearance issues in adjacent slots that make this too risky for a production solution imho) so I shelved that idea and moved on to (4) the AIO (All in One) card.