The individual game Zippy Race uses Horizontal Mirroring and has a bug that causes inadvertent CHR-ROM writes, which on this multicart of course become CHR-RAM writes. On emulators that fail to emulate the CHR-RAM write-protect, the "P" of the red "1UP" script on the right side of the screen becomes corrupted once the race has begun.krzysiobal wrote:Weird thing is that when horizontal mirroring is set, CHR-RAM is write protected.
Honestly, I'm quite surprised that the pirates cared about such small details.