diff --git a/src/mess/drivers/banctec.c b/src/mess/drivers/banctec.c
index d9c9459f458..b4710668719 100644
--- a/src/mess/drivers/banctec.c
+++ b/src/mess/drivers/banctec.c
@@ -1,9 +1,25 @@
+// license:MAME|GPL2+
+// copyright-holders:Felipe Sanches
+/***************************************************************************
+  This driver covers only the Operator Panel of the BancTec 91690 Document Processor equipment
+
+  Author: Felipe Sanches <juca@members.fsf.org>
+
+  Maintainence Manual: <https://garoa.net.br/w/images/PAINEL_BANCTEC_91690.PDF>
+*/
+
 #include "emu.h"
+#include "cpu/mcs51/mcs51.h"
 #include "cpu/m6805/m6805.h"
 #include "includes/banctec.h"
 #include "video/mc6845.h"
 
 static ADDRESS_MAP_START( banctec_mem , AS_PROGRAM, 8, banctec_state )
+	AM_RANGE(0x0000, 0x07ff) AM_ROM
+	AM_RANGE(0x0800, 0xffff) AM_RAM /* Probably wrong. Must be verified on pcb! */
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START( banctec_mcu_mem , AS_PROGRAM, 8, banctec_state )
 	AM_RANGE(0x0000, 0x1fff) AM_ROM
 	AM_RANGE(0x2000, 0x7fff) AM_RAM /* Probably wrong. Must be verified on pcb! */
 	AM_RANGE(0x8000, 0xffff) AM_RAM AM_SHARE("videoram") /* Probably wrong. Must be verified on pcb! */
@@ -67,9 +83,13 @@ GFXDECODE_END
 
 static MACHINE_CONFIG_START( banctec, banctec_state )
 	/* basic machine hardware */
-	MCFG_CPU_ADD("maincpu", M6805, 4000000)     /* 4000000? */
+
+	MCFG_CPU_ADD("maincpu", I80C31, XTAL_11_0592MHz)
 	MCFG_CPU_PROGRAM_MAP(banctec_mem)
 
+	MCFG_CPU_ADD("mcu", M6805, 4000000)     /* Actual MCU is a Motorola 6803 and the clock frequency is still unknown */
+	MCFG_CPU_PROGRAM_MAP(banctec_mcu_mem)
+
 // The video signal is generated by a R6545EAP character generator chip
 // The U20 EPROM holds the image data for the character set.
 
@@ -93,7 +113,10 @@ static MACHINE_CONFIG_START( banctec, banctec_state )
 MACHINE_CONFIG_END
 
 ROM_START(banctec)
-	ROM_REGION(0x2000,"maincpu",0)
+	ROM_REGION(0x800,"maincpu",0)
+	ROM_LOAD("banctec_eseries_panel_opnl.u20", 0x000, 0x800, CRC(c2ab9c06) SHA1(a296589034f656790ad5ffbce028dd846a40cf03))
+
+	ROM_REGION(0x2000,"mcu",0)
 	ROM_LOAD("banctec_eseries_panel.u8", 0x0000, 0x2000, CRC(f3335e0a) SHA1(5ca45fdcb7ef45a65c28c79abfa9ebb7a8a06619))
 
 	ROM_REGION(0x1000,"gfx",0)