diff --git a/rom5x/options/mame/B0_C500_MAME_no_35_1.s b/rom5x/options/mame/B0_C500_MAME_no_35_1.s
new file mode 100644
index 0000000..ec7d2d8
--- /dev/null
+++ b/rom5x/options/mame/B0_C500_MAME_no_35_1.s
@@ -0,0 +1,13 @@
+; remove 3.5" functionality for MAME
+; this bit causes slot 5 boot to go to do 6 boot instead
+; and also overwrites the firmware protocol bits to not
+; identify as a block device.
+.code
+.include "iic+.defs"
+rompatch $c500,0,"MAME_no_35_1"
+          ldx #$00
+          lda #$c6
+          stx $00
+          sta $01
+          jmp ($00)
+endpatch
diff --git a/rom5x/options/mame/B0_C5F8_MAME_no_35_2.s b/rom5x/options/mame/B0_C5F8_MAME_no_35_2.s
new file mode 100644
index 0000000..597e3fc
--- /dev/null
+++ b/rom5x/options/mame/B0_C5F8_MAME_no_35_2.s
@@ -0,0 +1,8 @@
+; remove 3.5" functionality for MAME
+; this bit removes protocol converter initialization
+; so the 3.5" drive code is never called
+.code
+.include "iic+.defs"
+rompatch $c5f8,0,"MAME_no_35_2"
+          rts
+endpatch
diff --git a/rom5x/options/mame/B0_C61A_MAME_no_35_3.s b/rom5x/options/mame/B0_C61A_MAME_no_35_3.s
new file mode 100644
index 0000000..1a38294
--- /dev/null
+++ b/rom5x/options/mame/B0_C61A_MAME_no_35_3.s
@@ -0,0 +1,7 @@
+; remove 3.5" functionality for MAME
+; this bit removes some 3.5" cruft added to the 5.25" boot code
+.code
+.include "iic+.defs"
+rompatch $c61a,0,"MAME_no_35_3"
+          lda $c089,x
+endpatch