Hi,

>No help delaying the manual reset.
>No such problem when shutting off DC, so this means it works OK then?
>Does it work properly when shutting off/reconnecting DC?
>No., So it doesn't?
>I'm lost.
(DC_OFF) -> (DC_AC_ON_ManualRST) => OK
(AC_OFF) -> (DC_AC_ON_ManualRST) => !OK

>Are you using external RAM which is not sufficiently grounded?
>Or any other bad or missing connection. Maybe the EA-pin (external
>address) has poor gnd.
I do not see any bad connection.

>At some point you mention a sequence
>AC_PF - delay (1-3S) - POR -> latched to incorrect state. Meaning
>some device is taking over the data/addressbus? Do you have diodes
>connected anti-parallel with your relays? Maybe when powering down
>the relays generate voltages that corrupt the 373's?
Each relay driver protected with a diode.

Thank you,
Oleg