about home run challenge, I think there were various 16bit games offering such option, not sure where Nintendo got its inspiration for the SSB game mode...

anyway, with some further change Jikkyou Parodius now boots up and gets very close to gameplay

[Linked Image from mamedev.emulab.it] [Linked Image from mamedev.emulab.it]

too bad it fails when things would become fun

[Linked Image from mamedev.emulab.it]

I find it surprising how far SA-1 can go without interrupts and DMA wink

Not sure if I'll be able to improve it further: my attempt to hook up NMI & IRQ lead to a bunch of regressions (I guess I failed to properly notify back the acknowledgement...)
We will see...