Don't subtract chunk start from address in read_word as this is inconsistent with other consumers of memory map definitions. Fixes graphical corruption in NBA Jam TE and possibly other titles that use the Acclaim mapper with a 32Mbit ROM

1 files changed, 1 insertions, 1 deletions

diff --git a/backend.c b/backend.c
index acf66d5..400b6d8 100644
--- a/backend.c
+++ b/backend.c
@@ -99,7 +99,7 @@ uint16_t read_word(uint32_t address, void **mem_pointers, cpu_options *opts, voi
 	if (!chunk) {
 		return 0xFFFF;
 	}
-	uint32_t offset = (address - chunk->start) & chunk->mask;
+	uint32_t offset = address & chunk->mask;
 	if (chunk->flags & MMAP_READ) {
 		uint8_t *base;
 		if (chunk->flags & MMAP_PTR_IDX) {