It looks like there's some kind of issue with the background tile at the left edge of text boxes. This is visible at the start of the first stage. It looks like a nametable bankswitch is necessary to display the text, and given AxROM's lack of IRQ, it's probably done with some kind of cycle-timed setup.
It looks like there's some kind of issue with the background tile at the left edge of text boxes. This is visible at the start of the first stage. It looks like a nametable bankswitch is necessary to display the text, and given AxROM's lack of IRQ, it's probably done with some kind of cycle-timed setup.