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Diffstat (limited to 'src/devices/bus/s100/dg640.cpp')
-rw-r--r--src/devices/bus/s100/dg640.cpp66
1 files changed, 57 insertions, 9 deletions
diff --git a/src/devices/bus/s100/dg640.cpp b/src/devices/bus/s100/dg640.cpp
index 18627c97bdf..7f79983f17d 100644
--- a/src/devices/bus/s100/dg640.cpp
+++ b/src/devices/bus/s100/dg640.cpp
@@ -2,11 +2,12 @@
// copyright-holders:Robbbert
/***************************************************************************
-David Griffiths DG640 board.
+David Griffiths DG640 Video Display Unit.
It was sold by Applied Technology. It uses a MCM6574 as a character generator.
The DG640 also supports blinking, reverse-video, and LORES graphics.
-It is a S100 card, also known as ETI-640.
+It is a S100 card, originally called "ETI 640" when it was first described
+in the April 1978 issue of Electronics Today International (Australia).
****************************************************************************/
@@ -18,12 +19,13 @@ It is a S100 card, also known as ETI-640.
-DEFINE_DEVICE_TYPE_PRIVATE(S100_DG640, device_s100_card_interface, dg640_device, "dg640", "S100_DG640")
+DEFINE_DEVICE_TYPE(S100_DG640, dg640_device, "dg640", "DG640 VDU")
dg640_device::dg640_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
: device_t(mconfig, S100_DG640, tag, owner, clock)
, device_s100_card_interface(mconfig, *this)
, m_p_chargen(*this, "chargen")
+ , m_dsw(*this, "DSW")
{}
void dg640_device::device_start()
@@ -112,7 +114,10 @@ uint32_t dg640_device::screen_update(screen_device &screen, bitmap_ind16 &bitmap
u8 dg640_device::s100_smemr_r(offs_t offset)
{
- if ((offset & 0xfc00) == 0)
+ if (m_dsw->read() != (offset & 0xf800) >> 11)
+ return 0xff;
+
+ if ((offset & 0x400) == 0)
return m_p_videoram[offset & 0x3ff];
else
return m_p_attribram[offset & 0x3ff];
@@ -120,13 +125,59 @@ u8 dg640_device::s100_smemr_r(offs_t offset)
void dg640_device::s100_mwrt_w(offs_t offset, u8 data)
{
- if ((offset & 0xfc00) == 0)
+ if (m_dsw->read() != (offset & 0xf800) >> 11)
+ return;
+
+ if ((offset & 0x400) == 0)
m_p_videoram[offset & 0x3ff] = data;
else
m_p_attribram[offset & 0x3ff] = data;
}
+static INPUT_PORTS_START(dg640)
+ PORT_START("DSW")
+ PORT_DIPNAME(0x1f, 0x0f, "Base Address") PORT_DIPLOCATION("SW1:1,2,3,4,5")
+ PORT_DIPSETTING(0x00, "0000")
+ PORT_DIPSETTING(0x01, "0800")
+ PORT_DIPSETTING(0x02, "1000")
+ PORT_DIPSETTING(0x03, "1800")
+ PORT_DIPSETTING(0x04, "2000")
+ PORT_DIPSETTING(0x05, "2800")
+ PORT_DIPSETTING(0x06, "3000")
+ PORT_DIPSETTING(0x07, "3800")
+ PORT_DIPSETTING(0x08, "4000")
+ PORT_DIPSETTING(0x09, "4800")
+ PORT_DIPSETTING(0x0a, "5000")
+ PORT_DIPSETTING(0x0b, "5800")
+ PORT_DIPSETTING(0x0c, "6000")
+ PORT_DIPSETTING(0x0d, "6800")
+ PORT_DIPSETTING(0x0e, "7000")
+ PORT_DIPSETTING(0x0f, "7800")
+ PORT_DIPSETTING(0x10, "8000")
+ PORT_DIPSETTING(0x11, "8800")
+ PORT_DIPSETTING(0x12, "9000")
+ PORT_DIPSETTING(0x13, "9800")
+ PORT_DIPSETTING(0x14, "A000")
+ PORT_DIPSETTING(0x15, "A800")
+ PORT_DIPSETTING(0x16, "B000")
+ PORT_DIPSETTING(0x17, "B800")
+ PORT_DIPSETTING(0x18, "C000")
+ PORT_DIPSETTING(0x19, "C800")
+ PORT_DIPSETTING(0x1a, "D000")
+ PORT_DIPSETTING(0x1b, "D800")
+ PORT_DIPSETTING(0x1c, "E000")
+ PORT_DIPSETTING(0x1d, "E800")
+ PORT_DIPSETTING(0x1e, "F000")
+ PORT_DIPSETTING(0x1f, "F800")
+INPUT_PORTS_END
+
+ioport_constructor dg640_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME(dg640);
+}
+
+
/* F4 Character Displayer */
static const gfx_layout dg640_charlayout =
{
@@ -149,11 +200,8 @@ void dg640_device::device_add_mconfig(machine_config &config)
{
screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
screen.set_color(rgb_t::amber());
- screen.set_refresh_hz(50);
- screen.set_vblank_time(ATTOSECONDS_IN_USEC(2500)); /* not accurate */
+ screen.set_raw(12_MHz_XTAL, 768, 0, 512, 312, 0, 256); // 15625 Hz horizontal
screen.set_screen_update(FUNC(dg640_device::screen_update));
- screen.set_size(512, 256);
- screen.set_visarea(0, 511, 0, 255);
screen.set_palette("palette");
GFXDECODE(config, "gfxdecode", "palette", gfx_dg640);