summaryrefslogtreecommitdiffstatshomepage
diff options
context:
space:
mode:
author Robbbert <Robbbert@users.noreply.github.com>2018-11-16 22:49:10 +1100
committer Robbbert <Robbbert@users.noreply.github.com>2018-11-16 22:49:10 +1100
commitb7219e3db5ac77e8c1e73c70f262bbff0afe90b1 (patch)
tree0fb38a0e51f4625be19841ee610466627798cc6e
parent20f4ace3b3f753a791d42a0832289360e456565c (diff)
LB-4 : hooked up some devices and the video.
-rw-r--r--src/mame/drivers/lb4.cpp107
1 files changed, 88 insertions, 19 deletions
diff --git a/src/mame/drivers/lb4.cpp b/src/mame/drivers/lb4.cpp
index e3647ac4ad8..880908c57b4 100644
--- a/src/mame/drivers/lb4.cpp
+++ b/src/mame/drivers/lb4.cpp
@@ -1,5 +1,5 @@
// license:BSD-3-Clause
-// copyright-holders:Ryan Holtz
+// copyright-holders:Ryan Holtz, Robbbert
/****************************************************************************
Liberty Electronics LB-4 serial terminal
@@ -11,6 +11,14 @@
- Zilog Z8430 CTC
- 16.6698MHz Crystal
+ Not sure what's going on here... the ACIA only has one serial channel,
+ is it for the host, the printer, or the keyboard? There's no real
+ evidence of a keyboard in the photos, so perhaps it's a display-only
+ unit with printer. If so, then Rx is from the host, and Tx is to the
+ printer.
+ If baudrate == 9600, then MASTER_CLOCK / 18 goes to CTC, it divides by
+ 6 to the ACIA, which divides by 16, to give roughly 9600.
+
****************************************************************************/
#include "emu.h"
@@ -20,6 +28,7 @@
#include "video/mc6845.h"
#include "screen.h"
#include "emupal.h"
+#include "bus/rs232/rs232.h"
#define MASTER_CLOCK 16.6698_MHz_XTAL
@@ -34,12 +43,15 @@ public:
, m_crtc(*this, "crtc")
, m_gfxdecode(*this, "gfxdecode")
, m_palette(*this, "palette")
+ , m_p_videoram(*this, "videoram")
+ , m_p_chargen(*this, "chargen")
{ }
void lb4(machine_config &config);
private:
void mem_map(address_map &map);
+ MC6845_UPDATE_ROW(crtc_update_row);
required_device<m6800_cpu_device> m_maincpu;
required_device<acia6850_device> m_acia;
@@ -47,57 +59,114 @@ private:
required_device<h46505_device> m_crtc;
required_device<gfxdecode_device> m_gfxdecode;
required_device<palette_device> m_palette;
+ required_shared_ptr<uint8_t> m_p_videoram;
+ required_region_ptr<u8> m_p_chargen;
};
void lb4_state::mem_map(address_map &map)
{
// There are what look like RAM reads/writes from 0000-03ff, but also accesses which look like attempts to talk to a device.
- map(0x4000, 0x47ff).ram();
- map(0x8000, 0x8000).w(m_crtc, FUNC(mc6845_device::address_w));
- map(0x8001, 0x8001).w(m_crtc, FUNC(mc6845_device::register_w));
+ map(0x0000, 0x03ff).ram();
+ map(0x2800, 0x2803).rw(m_ctc, FUNC(z80ctc_device::read), FUNC(z80ctc_device::write));
+ //map(0x3800, 0x3800).w // many writes of 43 and C3
+ map(0x4000, 0x47ff).ram().share("videoram");
+ map(0x8000, 0x8000).rw(m_crtc, FUNC(mc6845_device::status_r), FUNC(mc6845_device::address_w));
+ map(0x8001, 0x8001).rw(m_crtc, FUNC(mc6845_device::register_r), FUNC(mc6845_device::register_w));
+ map(0x9800, 0x9801).rw(m_acia, FUNC(acia6850_device::read), FUNC(acia6850_device::write));
map(0xe000, 0xffff).rom().region("maincpu", 0);
}
+MC6845_UPDATE_ROW(lb4_state::crtc_update_row)
+{
+ const rgb_t *palette = m_palette->palette()->entry_list_raw();
+ u8 chr,gfx,inv;
+ u16 mem,x;
+ u32 *p = &bitmap.pix32(y);
+
+ for (x = 0; x < x_count; x++)
+ {
+ mem = (ma + x) & 0x7ff;
+ chr = m_p_videoram[mem];
+ inv = ((x == cursor_x) ^ BIT(chr, 7)) ? 0xff : 0;
+ gfx = m_p_chargen[(chr<<4) | ra] ^ inv;
+
+ /* Display a scanline of a character (8 pixels) */
+ *p++ = palette[BIT(gfx, 7)];
+ *p++ = palette[BIT(gfx, 6)];
+ *p++ = palette[BIT(gfx, 5)];
+ *p++ = palette[BIT(gfx, 4)];
+ *p++ = palette[BIT(gfx, 3)];
+ *p++ = palette[BIT(gfx, 2)];
+ *p++ = palette[BIT(gfx, 1)];
+ *p++ = palette[BIT(gfx, 0)];
+ }
+}
+
static const gfx_layout char_layout =
{
- 8,16,
+ 8,12,
RGN_FRAC(1,1),
1,
{ 0 },
- { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
- { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, 15*8 },
+ { 0, 1, 2, 3, 4, 5, 6, 7 },
+ { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 9*8, 10*8, 11*8 },
8*16
};
static GFXDECODE_START(chars)
- GFXDECODE_ENTRY("chars", 0, char_layout, 0, 1)
+ GFXDECODE_ENTRY("chargen", 0, char_layout, 0, 1)
GFXDECODE_END
-void lb4_state::lb4(machine_config &config)
-{
+//void lb4_state::lb4(machine_config &config)
+//{
+MACHINE_CONFIG_START(lb4_state::lb4)
+
// All dividers unknown/guessed
M6800(config, m_maincpu, MASTER_CLOCK / 16);
m_maincpu->set_addrmap(AS_PROGRAM, &lb4_state::mem_map);
- ACIA6850(config, m_acia, MASTER_CLOCK / 128);
+ /* video hardware */
+ MCFG_SCREEN_ADD_MONOCHROME("screen", RASTER, rgb_t::green())
+ MCFG_SCREEN_REFRESH_RATE(50)
+ MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
+ MCFG_SCREEN_SIZE(640, 480)
+ MCFG_SCREEN_VISIBLE_AREA(0, 640-1, 0, 480-1)
+ MCFG_SCREEN_UPDATE_DEVICE("crtc", mc6845_device, screen_update)
+ MCFG_PALETTE_ADD_MONOCHROME("palette")
+ //PALETTE(config, m_palette, 2).set_init("palette", FUNC(palette_device::palette_init_monochrome));
+ MCFG_DEVICE_ADD("gfxdecode", GFXDECODE, "palette", chars)
+ //GFXDECODE(config, m_gfxdecode, m_palette, chars);
+
+ //H46505(config, m_crtc, MASTER_CLOCK / 10);
+ MCFG_MC6845_ADD("crtc", H46505, "screen", MASTER_CLOCK / 10)
+ MCFG_MC6845_SHOW_BORDER_AREA(false)
+ MCFG_MC6845_CHAR_WIDTH(8)
+ MCFG_MC6845_UPDATE_ROW_CB(lb4_state, crtc_update_row)
+
+ ACIA6850(config, m_acia, 0);
+ m_acia->txd_handler().set("rs232", FUNC(rs232_port_device::write_txd));
+ m_acia->rts_handler().set("rs232", FUNC(rs232_port_device::write_rts));
+
+ rs232_port_device &rs232(RS232_PORT(config, "rs232", default_rs232_devices, nullptr));
+ rs232.rxd_handler().set(m_acia, FUNC(acia6850_device::write_rxd));
+ rs232.cts_handler().set(m_acia, FUNC(acia6850_device::write_cts));
Z80CTC(config, m_ctc, MASTER_CLOCK / 4);
+ m_ctc->set_clk<0>(MASTER_CLOCK / 18);
+ m_ctc->zc_callback<0>().set(m_acia, FUNC(acia6850_device::write_txc));
+ m_ctc->zc_callback<0>().append(m_acia, FUNC(acia6850_device::write_rxc));
+//}
+MACHINE_CONFIG_END
- H46505(config, m_crtc, MASTER_CLOCK);
-
- GFXDECODE(config, m_gfxdecode, m_palette, chars);
-
- PALETTE(config, m_palette, 2).set_init("palette", FUNC(palette_device::palette_init_monochrome));
-}
static INPUT_PORTS_START( lb4 )
INPUT_PORTS_END
ROM_START( lb4 )
- ROM_REGION( 0x10000, "maincpu", 0 )
+ ROM_REGION( 0x2000, "maincpu", 0 )
ROM_LOAD( "u8.bin", 0x0000, 0x2000, CRC(2e375abc) SHA1(12ad1e49c5773c36c3a8d65845c9a50f9dec141f) )
- ROM_REGION( 0x1000, "chars", 0 )
+ ROM_REGION( 0x1000, "chargen", 0 )
ROM_LOAD( "u32.bin", 0x0000, 0x1000, CRC(f6d86e87) SHA1(c0885e4a35095a730d760bf91a1cf4e8edd6a2bb) )
ROM_END