On Mon, 13 Feb 1995 12:43:27 +0000 (GMT), Simon Cooke said: > On another note -- remember the paging "bug" you were talking about? It > may be something to do with the fact that the ASIC only samples IORQ for > its logic -- not M1 as well, so as Prodos uses IM2, the RETI sequence may > trigger spurious I/O (as when you do a RETI, IORQ and M1 both drop low).
It is my understanding that /M1 and /IORQ are activated at the time when a maskable interrupt is recognised (regardless of the interrupt mode). I see no reason why this should happen at RETI time. My data sheet claims that RETI is the same as RET. imc
