There is a subtle difference between the NMOS 6532 and the CMOS G65SC32 datasheet regarding the timer of 1 in elapsed time.

It is in the paragraph starting at ‘Once the time has counted down to 00000000, an interrupt will occur ….’
On the 6532 that takes 27T (T is the clock tick), on the G65SC32 28T.
That makes in the example the total elapsed time 443T on the 6532 and 444T on the G65SC32.

Look at these pages about the timer from the datasheets of the R6532 and 6G5SC32 (see below and here)

R6532 datasheet page 5

R6532 datasheet page 6

G65SC32 datasheet page 4

G65SC32 datasheet page 5

	Rockwell R6532
	GTE G65SC32