Not much time to play today (too much snow!).
Switching SMBv2 K3 8<-->16 bits makes no difference.
I don't have a 74F138 or 74F10 here, but have ordered them. Should be here midweek weather permitting.
I did have 74S138 and 74S10 - unfortunately the problem persisted with them.
I jumpered the parallel port board for ECh--EFh so I could use the output LED's to see what the ports should contain.
I can set and clear the EE,01/00 bit fine on the parallel port board, but it stays "stuck on" with the SMBv2 board.
On 2/7/2015 11:47 PM, John Monahan wrote: