i have some doubts about mmc3 and i want to know if what i know (or i think i know) is correct.
1- If the counter is set to decimal 125. There will pass exactly 125 scanlines to fire the IRQ?
2- the pre-render (-1) sl clocks the IRQ counter?
3- if the latch is set to 3 will it take one sl long to load the latch in the counter (when A12 0->1). So if this is the case my question "1" should take 126 sl? and if q. 2 is TRUE will it take 125?.
4 - If the counter is to "0" will stay at 0 until the latch is changed and no irq is generated.
thxs.
1- If the counter is set to decimal 125. There will pass exactly 125 scanlines to fire the IRQ?
2- the pre-render (-1) sl clocks the IRQ counter?
3- if the latch is set to 3 will it take one sl long to load the latch in the counter (when A12 0->1). So if this is the case my question "1" should take 126 sl? and if q. 2 is TRUE will it take 125?.
4 - If the counter is to "0" will stay at 0 until the latch is changed and no irq is generated.
thxs.