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Do you still have the Micro KIM-1? Greg

In the late 90s I obtained several 386 based ISA and stand alone 386 board that contained ZF Micro Systems module. I unfortunately sold then around 2000. I do have several floppies with information/flash files on the 386 ZF modules still and have the ISA schematics and board layout files. I had...

My bad. Right, My logic fail to realize that the 4KB to 8KB jumps from 24 pins to 28 pins per the JEDEC standard which I know but somehow zoned out during the reply. Greg

Gary Do you mean 28 and 27? 26 is NC and 27 is /WE which you want high, i.e. connect to 28. Greg

Just like the HCCA interface and 115200 baud it made no difference using the 1.79MHz from system on the 8251 for TX. Greg

Yep, It is slightly slower and didn't want this to be variable while testing but I will try this tonight for sure. It looks like the baud rate that this would produce is the same as the HCCA port now. 1.79MHz/16 = 111,875 baud. That is a good idea piping it out through the unused pin of the...

The keyboard 8251 is poop'n NABUs out the TX port At 115,200 baud. Essentially just add a 1.843200MHz crystal oscillator to the /TxC input, grab the TxD out and wiggle TX bit control reg. This great for debug output or maybe Cloud CP/M 80 column serial display. hint, hint. :)

Looking at the schematic for the NABU I see that there is an unused TX port on the keyboard's 8251 UART. I was think that this could be used as a console out which could be duplicated from Cloud CP/M VDM, redirect device from 3.1 CP/M base or simply a debug-out side port. I have just got a...