enable prg ram

zohassadar · zohassadar · commit 397433c5a463 · 2023-08-24T12:28:12.000-07:00
diff --git a/src/io.asm b/src/io.asm
@@ -49,6 +49,7 @@ MMC1_CHR1   := $DFFF
 MMC3_BANK_SELECT := $8000
 MMC3_BANK_DATA := $8001
 MMC3_MIRRORING := $A000
+MMC3_PRG_RAM := $A001
 
 .macro RESET_MMC1
 .if INES_MAPPER = 1
diff --git a/src/reset.asm b/src/reset.asm
@@ -41,6 +41,8 @@ mmc3Init:
         iny
         stx     MMC3_BANK_SELECT
         sty     MMC3_BANK_DATA
+        lda     #$80 ; enable PRG RAM
+        sta     MMC3_PRG_RAM
         rts
 .endif
 
