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Great News - my second attempt at building a N8-4314 appears to be a good one. System booted right up using ROMWBW 2.7.1 and is totally stable. SD card and LED are working as expected. RTC is working correctly.
I need to test floppy interface and just for fun exercise some of the other I/O including the video, PS2 keyboard, and audio. I need to do some research on that score. As is, the 9918 appears to be responding to some ROMWBW initialization as the screen shows a full screen of the same symbol after a reset. The usual lights on a connected keyboard are dark - do not know if that means anything.
A note on as-built configuration. I used all 74LS logic except for the 574's that are 74ALS574's just because I did not immediately find 74LS574's at DigiKey, my preferred source. CPU oscillator is 18.432 MHz. Since I have no plans to use the ECB interface I have not set the K1 configuration - there is no jumper on K1. K21 & K22 are set to 1-2 jumpered but the two 4700 ohm resistors are still in place - without anything connected to the ECB bus this should also be a “don't care”.
Rich Leary