diff --git a/src/mame/drivers/naomi.cpp b/src/mame/drivers/naomi.cpp
index 47a7af5ff85..f0c9e4c7230 100644
--- a/src/mame/drivers/naomi.cpp
+++ b/src/mame/drivers/naomi.cpp
@@ -332,7 +332,7 @@ Soul Surfer (Rev A)                           840-0095C  23838C  21 (64Mb)   pre
 Star Horse (server)                           840-0055C  23626   17 (64Mb)   present  315-6206  not present   requires 837-13785 ARCNET&IO BD
 The King of Route 66 (Rev A)                  840-0087C  23819A  20 (64Mb)   present  315-6206  not present   content is the same as regular 171-8132A cart
 The Maze of the Kings (prototype)               no cart  *       21 (64Mb)   present  315-6206  FRI           * flash-PCB, not dumped but known to exist
-Tokyo Bus Guide (Rev A)                       840-0045C  23468A  18 (64Mb)   present  315-6206  317-0290-COM
+Tokyo Bus Guide (Rev A)                       840-0045C  23468A  18 (64Mb)   present  315-6206  317-0290-COM  requires 837-13844 JVS IO
 Virtua NBA (prototype)                          no cart  *       21 (64Mb)   present  315-6206  317-0271-COM  * instead of EPROM have tiny PCB with 2 flashroms on it
 Virtua Tennis / Power Smash (prototype)         no cart  *       21 (64Mb)   present  315-6206  317-0263-COM  * flash-PCB, title screen have label "SOFT R&D Dept.#3", not dumped but known to exist
 
diff --git a/src/mame/machine/awboard.cpp b/src/mame/machine/awboard.cpp
index c13066d31ca..29c2bd44960 100644
--- a/src/mame/machine/awboard.cpp
+++ b/src/mame/machine/awboard.cpp
@@ -307,7 +307,6 @@ READ16_MEMBER(aw_rom_board::pio_r)
 	if (roffset >= (mpr_offset / 2))
 		roffset += mpr_bank * 0x4000000;
 	UINT16 retval = (m_region->bytes() > roffset) ? m_region->u16(roffset) : 0;
-	epr_offset++;
 	return retval;
 }
 
@@ -316,7 +315,6 @@ WRITE16_MEMBER(aw_rom_board::pio_w)
 	// write to ROM board address space, including FlashROM programming using CFI (TODO)
 	if (epr_offset == 0x7fffff)
 		mpr_bank = data & 3;
-	epr_offset++;
 }
 
 WRITE16_MEMBER(aw_rom_board::epr_offsetl_w)