VIA T2 doesn't count manually-induced PB6 pulses #56
Description
Reported by @tom-seddon on mattgodbolt/jsbeeb#268 but also happens in beebjit (where shamelessly I was going to steal from)
@tom-seddon says:
T2 should count PB6 pulses that are induced by changing ORB or DDRB. See attached disc - load image, run with SHIFT+BREAK. Expected output:
T2=100 (&64)
TOGGLE IN OUTPUT MODE
T2=100 (&64)
T2=99 (&63)
T2=99 (&63)
T2=99 (&63)
TOGGLE VIA DDRB
T2=99 (&63)
T2=98 (&62)
T2=98 (&62)