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author Robbbert <robbbert@users.noreply.github.com>2013-09-15 12:48:27 +0000
committer Robbbert <robbbert@users.noreply.github.com>2013-09-15 12:48:27 +0000
commita5d4726978018a1e6ae54ea1fbea287138c00cb7 (patch)
treedeeefd68d7d2f32eb47723a6425be748ea4068e1
parent32f1b6aa47f4c3dc3ffa3ea956e34681d9cd2309 (diff)
(MESS) c900 : Added notes, extra rom.
-rw-r--r--src/mess/drivers/c900.c91
1 files changed, 61 insertions, 30 deletions
diff --git a/src/mess/drivers/c900.c b/src/mess/drivers/c900.c
index a805ca2e006..2a3dd9e1857 100644
--- a/src/mess/drivers/c900.c
+++ b/src/mess/drivers/c900.c
@@ -1,4 +1,4 @@
-/*
+/******************************************************************************************
Commodore C900
UNIX prototype
@@ -6,7 +6,14 @@
http://www.zimmers.net/cbmpics/c900.html
http://www.zimmers.net/cbmpics/cbm/900/c900-chips.txt
-*/
+ Chips: Z8001 CPU, Z8010 MMU, Z8030 SCC, Z8036 CIO. Crystal: 12MHz
+
+ The Z8030 runs 2 serial ports. The Z8036 runs the IEEE interface and the speaker.
+
+ The FDC is an intelligent device that communicates with the main board via the MMU.
+ It has a 6508 CPU.
+
+*******************************************************************************************/
#include "emu.h"
@@ -18,38 +25,45 @@ class c900_state : public driver_device
{
public:
c900_state(const machine_config &mconfig, device_type type, const char *tag)
- : driver_device(mconfig, type, tag),
- m_maincpu(*this, "maincpu"),
- m_terminal(*this, TERMINAL_TAG)
+ : driver_device(mconfig, type, tag)
+ , m_maincpu(*this, "maincpu")
+ , m_terminal(*this, TERMINAL_TAG)
{ }
-// UINT32 screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
+ DECLARE_READ16_MEMBER(port1e_r);
DECLARE_READ16_MEMBER(key_r);
DECLARE_READ16_MEMBER(stat_r);
DECLARE_WRITE8_MEMBER(kbd_put);
+private:
UINT8 m_term_data;
required_device<cpu_device> m_maincpu;
required_device<generic_terminal_device> m_terminal;
};
static ADDRESS_MAP_START(c900_mem, AS_PROGRAM, 16, c900_state)
- AM_RANGE(0x0000, 0x7fff) AM_ROM AM_REGION("maincpu", 0)
- AM_RANGE(0x8000, 0xffff) AM_RAM
+ AM_RANGE(0x00000, 0x07fff) AM_ROM AM_REGION("roms", 0)
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START(c900_data, AS_DATA, 16, c900_state)
+ AM_RANGE(0x00000, 0x07fff) AM_ROM AM_REGION("roms", 0)
+ AM_RANGE(0x08000, 0x6ffff) AM_RAM
ADDRESS_MAP_END
static ADDRESS_MAP_START(c900_io, AS_IO, 16, c900_state)
- AM_RANGE(0x100, 0x101) AM_READ(stat_r)
- AM_RANGE(0x110, 0x111) AM_READ(key_r) AM_DEVWRITE8(TERMINAL_TAG, generic_terminal_device, write, 0x00ff)
+ AM_RANGE(0x0010, 0x0011) AM_READ(stat_r)
+ AM_RANGE(0x001A, 0x001B) AM_READ(key_r)
+ AM_RANGE(0x001E, 0x001F) AM_READ(port1e_r)
+ AM_RANGE(0x0100, 0x0101) AM_READ(stat_r)
+ AM_RANGE(0x0110, 0x0111) AM_READ(key_r) AM_DEVWRITE8(TERMINAL_TAG, generic_terminal_device, write, 0x00ff)
ADDRESS_MAP_END
static INPUT_PORTS_START( c900 )
INPUT_PORTS_END
-//UINT32 c900_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
-//{
-// return 0;
-//}
-
+READ16_MEMBER( c900_state::port1e_r )
+{
+ return 0;
+}
READ16_MEMBER( c900_state::key_r )
{
@@ -60,7 +74,7 @@ READ16_MEMBER( c900_state::key_r )
READ16_MEMBER( c900_state::stat_r )
{
- return (m_term_data) ? 5 : 4;
+ return (m_term_data) ? 6 : 4;
}
WRITE8_MEMBER( c900_state::kbd_put )
@@ -73,31 +87,48 @@ static GENERIC_TERMINAL_INTERFACE( terminal_intf )
DEVCB_DRIVER_MEMBER(c900_state, kbd_put)
};
+/* F4 Character Displayer */
+static const gfx_layout c900_charlayout =
+{
+ 8, 16, /* 8 x 16 characters */
+ 256, /* 256 characters */
+ 1, /* 1 bits per pixel */
+ { 0 }, /* no bitplanes */
+ /* x offsets */
+ { 0, 1, 2, 3, 4, 5, 6, 7 },
+ /* y offsets */
+ { 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 },
+ 8*16 /* every char takes 16 bytes */
+};
+
+static GFXDECODE_START( c900 )
+ GFXDECODE_ENTRY( "chargen", 0x0000, c900_charlayout, 0, 1 )
+GFXDECODE_END
+
static MACHINE_CONFIG_START( c900, c900_state )
/* basic machine hardware */
- MCFG_CPU_ADD("maincpu", Z8001, 4000000)
+ MCFG_CPU_ADD("maincpu", Z8001, XTAL_12MHz / 2)
MCFG_CPU_PROGRAM_MAP(c900_mem)
+ MCFG_CPU_DATA_MAP(c900_data)
MCFG_CPU_IO_MAP(c900_io)
- /* video hardware */
-// MCFG_SCREEN_ADD("screen", RASTER)
-// MCFG_SCREEN_REFRESH_RATE(60)
-// MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
-// MCFG_SCREEN_SIZE(512, 256)
-// MCFG_SCREEN_VISIBLE_AREA(0, 512-1, 0, 256-1)
-// MCFG_PALETTE_LENGTH(4)
-// MCFG_SCREEN_UPDATE_DRIVER(c900_state, screen_update)
MCFG_GENERIC_TERMINAL_ADD(TERMINAL_TAG, terminal_intf)
+ MCFG_GFXDECODE(c900)
+ MCFG_PALETTE_LENGTH(2)
+ MCFG_PALETTE_INIT_OVERRIDE(driver_device, black_and_white)
MACHINE_CONFIG_END
ROM_START( c900 )
- ROM_REGION16_LE( 0x8000, "maincpu", 0 )
- ROM_LOAD16_BYTE( "c 900 boot-h v 1.0.bin.u17", 0x0000, 0x4000, CRC(c3aa7fc1) SHA1(ff12dd100fa7b1e7e931e9a8ef4c4f5cc056e099) )
- ROM_LOAD16_BYTE( "c 900 boot-l v 1.0.bin.u18", 0x0001, 0x4000, CRC(0aa39272) SHA1(b2c5da4586d38fc66bb33aafeae4dbda36080f1e) )
+ ROM_REGION16_LE( 0x8000, "roms", 0 )
+ ROM_LOAD16_BYTE( "c 900 boot-h v 1.0.bin.u17", 0x0001, 0x4000, CRC(c3aa7fc1) SHA1(ff12dd100fa7b1e7e931e9a8ef4c4f5cc056e099) )
+ ROM_LOAD16_BYTE( "c 900 boot-l v 1.0.bin.u18", 0x0000, 0x4000, CRC(0aa39272) SHA1(b2c5da4586d38fc66bb33aafeae4dbda36080f1e) )
+
+ ROM_REGION( 0x2000, "fdc", 0 )
+ ROM_LOAD( "s41_6-20-85.bin", 0x0000, 0x2000, CRC(ec245721) SHA1(4cc19014b4887833a56b1236dc5fe39cc5d7b5c3) )
- ROM_REGION( 0x1000, "chargen", 0 )
+ ROM_REGION( 0x1000, "chargen", 0 ) // this must be for the c900 terminal as the mainframe has no video output
ROM_LOAD( "380217-01.u2", 0x0000, 0x1000, CRC(64cb4171) SHA1(e60d796170addfd27e2c33090f9c512c7e3f99f5) )
ROM_END
/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS */
-COMP( 1985, c900, 0, 0, c900, c900, driver_device, 0, "Commodore", "Commodore 900", GAME_IS_SKELETON | GAME_NOT_WORKING | GAME_NO_SOUND)
+COMP( 1985, c900, 0, 0, c900, c900, driver_device, 0, "Commodore", "Commodore 900", GAME_IS_SKELETON )