I added a few flicks of LATB,0 through the power-up code but
don't see any of them when the reset button is released (from
0.05V, measured at the pin). The LCD still shows the last thing
before a reset attempt

Looking at the reset vector, 0x0000, it says 'goto 0x009e0e', and
0x9E0E is where code starts

I thought I had the syntax OK

The interrupt vectors are set by

  .global __reset             ;program entry point
  .global __U1RXInterrupt     ;receiver ISR
  .global __T1Interrupt       ;Timer 1 ISR

The start of the appropriate routine is eg

          __reset:
or
           __T1Interrupt:

Timer1 interrupt definitely works, so does reset on power-up

As I mentioned, there's little about /MCLR in the documentation.
It's not even included as a cold reset with POR and BOR

ww1.microchip.com/downloads/en/DeviceDoc/70192C.pdf

Joe


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