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diff --git a/src/mess/drivers/vcs80.c b/src/mess/drivers/vcs80.c
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+/***************************************************************************
+
+ VCS-80
+
+ 12/05/2009 Skeleton driver.
+
+ http://hc-ddr.hucki.net/entwicklungssysteme.htm#VCS_80_von_Eckhard_Schiller
+
+This system is heavily based on the tk80. The display and keyboard matrix
+are very similar, while the operation is easier in the vcs80. The hardware
+is completely different however.
+
+Pasting:
+ 0-F : as is
+ A+ : ^
+ A- : V
+ MA : -
+ GO : X
+
+When booted, the system begins at 0000 which is ROM. You need to change the
+address to 0400 before entering a program. Here is a test to paste in:
+0400-11^22^33^44^55^66^77^88^99^0400-
+Press the up-arrow to confirm data has been entered.
+
+Operation:
+4 digits at left is the address; 2 digits at right is the data.
+As you increment addresses, the middle 2 digits show the previous byte.
+You can enter 4 digits, and pressing 'MA' will transfer this info
+to the left, thus setting the address to this value. Press 'A+' to
+store new data and increment the address.
+
+****************************************************************************/
+
+#include "includes/vcs80.h"
+#include "vcs80.lh"
+
+/* Read/Write Handlers */
+
+READ8_MEMBER( vcs80_state::pio_r )
+{
+ switch (offset)
+ {
+ case 0: return m_pio->control_read();
+ case 1: return m_pio->control_read();
+ case 2: return m_pio->data_read(1);
+ case 3: return m_pio->data_read(0);
+ }
+
+ return 0;
+}
+
+WRITE8_MEMBER( vcs80_state::pio_w )
+{
+ switch (offset)
+ {
+ case 0: m_pio->control_write(1, data); break;
+ case 1: m_pio->control_write(0, data); break;
+ case 2: m_pio->data_write(1, data); break;
+ case 3: m_pio->data_write(0, data); break;
+ }
+}
+
+/* Memory Maps */
+
+static ADDRESS_MAP_START( vcs80_mem, AS_PROGRAM, 8, vcs80_state )
+ AM_RANGE(0x0000, 0x01ff) AM_ROM
+ AM_RANGE(0x0400, 0x07ff) AM_RAM
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START( vcs80_io, AS_IO, 8, vcs80_state )
+ ADDRESS_MAP_GLOBAL_MASK(0xff)
+ AM_RANGE(0x04, 0x07) AM_READWRITE(pio_r, pio_w)
+ADDRESS_MAP_END
+
+/* Input Ports */
+
+static INPUT_PORTS_START( vcs80 )
+ PORT_START("ROW0")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_0) PORT_CHAR('0')
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_1) PORT_CHAR('1')
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_2) PORT_CHAR('2')
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_3) PORT_CHAR('3')
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_4) PORT_CHAR('4')
+ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_5) PORT_CHAR('5')
+ PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_6) PORT_CHAR('6')
+ PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_7) PORT_CHAR('7')
+
+ PORT_START("ROW1")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_8) PORT_CHAR('8')
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_9) PORT_CHAR('9')
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_A) PORT_CHAR('A')
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_B) PORT_CHAR('B')
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_C) PORT_CHAR('C')
+ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_D) PORT_CHAR('D')
+ PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_E) PORT_CHAR('E')
+ PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_F) PORT_CHAR('F')
+
+ PORT_START("ROW2")
+ PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("A+") PORT_CODE(KEYCODE_UP) PORT_CHAR('^')
+ PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("A-") PORT_CODE(KEYCODE_DOWN) PORT_CHAR('V')
+ PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("MA") PORT_CODE(KEYCODE_M) PORT_CHAR('-')
+ PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("RE") PORT_CODE(KEYCODE_R) PORT_CHAR('R')
+ PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("GO") PORT_CODE(KEYCODE_G) PORT_CODE(KEYCODE_X) PORT_CHAR('X')
+ PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("TR") PORT_CODE(KEYCODE_T)
+ PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("ST") PORT_CODE(KEYCODE_S)
+ PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("PE") PORT_CODE(KEYCODE_P)
+INPUT_PORTS_END
+
+/* Z80-PIO Interface */
+
+static TIMER_DEVICE_CALLBACK( vcs80_keyboard_tick )
+{
+ vcs80_state *state = timer.machine().driver_data<vcs80_state>();
+
+ if (state->m_keyclk)
+ {
+ state->m_keylatch++;
+ state->m_keylatch &= 7;
+ }
+
+ state->m_pio->port_a_write(state->m_keyclk << 7);
+
+ state->m_keyclk = !state->m_keyclk;
+}
+
+READ8_MEMBER( vcs80_state::pio_pa_r )
+{
+ /*
+
+ bit description
+
+ PA0 keyboard and led latch bit 0
+ PA1 keyboard and led latch bit 1
+ PA2 keyboard and led latch bit 2
+ PA3 GND
+ PA4 keyboard row input 0
+ PA5 keyboard row input 1
+ PA6 keyboard row input 2
+ PA7 demultiplexer clock input
+
+ */
+
+ UINT8 data = 0;
+
+ /* keyboard and led latch */
+ data |= m_keylatch;
+
+ /* keyboard rows */
+ data |= BIT(ioport("ROW0")->read(), m_keylatch) << 4;
+ data |= BIT(ioport("ROW1")->read(), m_keylatch) << 5;
+ data |= BIT(ioport("ROW2")->read(), m_keylatch) << 6;
+
+ /* demultiplexer clock */
+ data |= (m_keyclk << 7);
+
+ return data;
+}
+
+WRITE8_MEMBER( vcs80_state::pio_pb_w )
+{
+ /*
+
+ bit description
+
+ PB0 VQD30 segment A
+ PB1 VQD30 segment B
+ PB2 VQD30 segment C
+ PB3 VQD30 segment D
+ PB4 VQD30 segment E
+ PB5 VQD30 segment G
+ PB6 VQD30 segment F
+ PB7 _A0
+
+ */
+
+ UINT8 led_data = BITSWAP8(data & 0x7f, 7, 5, 6, 4, 3, 2, 1, 0);
+ int digit = m_keylatch;
+
+ /* skip middle digit */
+ if (digit > 3) digit++;
+
+ output_set_digit_value(8 - digit, led_data);
+}
+
+static Z80PIO_INTERFACE( pio_intf )
+{
+ DEVCB_CPU_INPUT_LINE(Z80_TAG, INPUT_LINE_IRQ0), /* callback when change interrupt status */
+ DEVCB_DRIVER_MEMBER(vcs80_state, pio_pa_r), /* port A read callback */
+ DEVCB_NULL, /* port A write callback */
+ DEVCB_NULL, /* portA ready active callback */
+ DEVCB_NULL, /* port B read callback */
+ DEVCB_DRIVER_MEMBER(vcs80_state, pio_pb_w), /* port B write callback */
+ DEVCB_NULL /* portB ready active callback */
+};
+
+/* Z80 Daisy Chain */
+
+static const z80_daisy_config vcs80_daisy_chain[] =
+{
+ { Z80PIO_TAG },
+ { NULL }
+};
+
+/* Machine Initialization */
+
+void vcs80_state::machine_start()
+{
+ m_pio->strobe_a(1);
+ m_pio->strobe_b(1);
+
+ /* register for state saving */
+ save_item(NAME(m_keylatch));
+ save_item(NAME(m_keyclk));
+}
+
+/* Machine Driver */
+
+static MACHINE_CONFIG_START( vcs80, vcs80_state )
+ /* basic machine hardware */
+ MCFG_CPU_ADD(Z80_TAG, Z80, XTAL_5MHz/2) /* U880D */
+ MCFG_CPU_PROGRAM_MAP(vcs80_mem)
+ MCFG_CPU_IO_MAP(vcs80_io)
+ MCFG_CPU_CONFIG(vcs80_daisy_chain)
+
+ /* keyboard timer */
+ MCFG_TIMER_ADD_PERIODIC("keyboard", vcs80_keyboard_tick, attotime::from_hz(1000))
+
+ /* video hardware */
+ MCFG_DEFAULT_LAYOUT( layout_vcs80 )
+
+ /* devices */
+ MCFG_Z80PIO_ADD(Z80PIO_TAG, XTAL_5MHz/2, pio_intf)
+
+ /* internal ram */
+ MCFG_RAM_ADD(RAM_TAG)
+ MCFG_RAM_DEFAULT_SIZE("1K")
+MACHINE_CONFIG_END
+
+/* ROMs */
+
+ROM_START( vcs80 )
+ ROM_REGION( 0x10000, Z80_TAG, 0 )
+ ROM_LOAD( "monitor.rom", 0x0000, 0x0200, CRC(44aff4e9) SHA1(3472e5a9357eaba3ed6de65dee2b1c6b29349dd2) )
+ROM_END
+
+/* Driver Initialization */
+
+DIRECT_UPDATE_MEMBER(vcs80_state::vcs80_direct_update_handler)
+{
+ /* _A0 is connected to PIO PB7 */
+ m_pio->port_b_write((!BIT(address, 0)) << 7);
+
+ return address;
+}
+
+DRIVER_INIT_MEMBER(vcs80_state,vcs80)
+{
+ machine().device(Z80_TAG)->memory().space(AS_PROGRAM)->set_direct_update_handler(direct_update_delegate(FUNC(vcs80_state::vcs80_direct_update_handler), this));
+ machine().device(Z80_TAG)->memory().space(AS_IO)->set_direct_update_handler(direct_update_delegate(FUNC(vcs80_state::vcs80_direct_update_handler), this));
+}
+
+/* System Drivers */
+
+/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS */
+COMP( 1983, vcs80, 0, 0, vcs80, vcs80, vcs80_state, vcs80, "Eckhard Schiller", "VCS-80", GAME_SUPPORTS_SAVE | GAME_NO_SOUND)