// license:BSD-3-Clause
// copyright-holders:Curt Coder
/******************************************************************************************
Commodore C900
UNIX prototype
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.
Disk drive is a Matsushita JA-560-012
Our implementation of z80scc is currently incomplete and therefore unusable.
Increasing the amount of RAM stops the error message, however it still keeps running
into the weeds (jumps to 00000).
*******************************************************************************************/
#include "emu.h"
#include "cpu/z8000/z8000.h"
//#include "machine/z80scc.h"
//#include "bus/rs232/rs232.h"
#include "machine/terminal.h"
#include "machine/z8536.h"
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")
{ }
DECLARE_READ16_MEMBER(key_r);
DECLARE_READ16_MEMBER(stat_r);
void kbd_put(u8 data);
void c900(machine_config &config);
void data_map(address_map &map);
void io_map(address_map &map);
void mem_map(address_map &map);
private:
uint8_t m_term_data;
required_device<cpu_device> m_maincpu;
required_device<generic_terminal_device> m_terminal;
};
void c900_state::mem_map(address_map &map)
{
map(0x00000, 0x07fff).rom().region("roms", 0);
}
void c900_state::data_map(address_map &map)
{
map(0x00000, 0x07fff).rom().region("roms", 0);
map(0x08000, 0x6ffff).ram();
}
void c900_state::io_map(address_map &map)
{
map(0x0000, 0x007f).rw("cio", FUNC(z8036_device::read), FUNC(z8036_device::write)).umask16(0x00ff);
//AM_RANGE(0x0100, 0x011f) AM_DEVREADWRITE8("scc", scc8030_device, zbus_r, zbus_w, 0x00ff) // range for one channel
map(0x0100, 0x0101).r(this, FUNC(c900_state::stat_r));
map(0x0110, 0x0111).r(this, FUNC(c900_state::key_r));
map(0x0111, 0x0111).w(m_terminal, FUNC(generic_terminal_device::write));
}
static INPUT_PORTS_START( c900 )
INPUT_PORTS_END
READ16_MEMBER( c900_state::key_r )
{
uint8_t ret = m_term_data;
m_term_data = 0;
return ret;
}
READ16_MEMBER( c900_state::stat_r )
{
return (m_term_data) ? 5 : 4;
}
void c900_state::kbd_put(u8 data)
{
m_term_data = data;
}
/* 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
MACHINE_CONFIG_START(c900_state::c900)
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", Z8001, XTAL(12'000'000) / 2)
MCFG_CPU_PROGRAM_MAP(mem_map)
MCFG_CPU_DATA_MAP(data_map)
MCFG_CPU_IO_MAP(io_map)
MCFG_DEVICE_ADD("terminal", GENERIC_TERMINAL, 0)
MCFG_GENERIC_TERMINAL_KEYBOARD_CB(PUT(c900_state, kbd_put))
MCFG_GFXDECODE_ADD("gfxdecode", "palette", c900)
MCFG_PALETTE_ADD_MONOCHROME("palette")
MCFG_DEVICE_ADD("cio", Z8036, 6'000'000)
//MCFG_SCC8030_ADD("scc", 6'000'000, 326400, 0, 326400, 0)
/* Port A */
//MCFG_Z80SCC_OUT_TXDA_CB(DEVWRITELINE("rs232a", rs232_port_device, write_txd))
//MCFG_Z80SCC_OUT_DTRA_CB(DEVWRITELINE("rs232a", rs232_port_device, write_dtr))
//MCFG_Z80SCC_OUT_RTSA_CB(DEVWRITELINE("rs232a", rs232_port_device, write_rts))
//MCFG_Z80SCC_OUT_INT_CB(WRITELINE(lwriter_state, scc_int))
//MCFG_RS232_PORT_ADD ("rs232a", default_rs232_devices, "terminal")
//MCFG_RS232_RXD_HANDLER (DEVWRITELINE ("scc", scc8030_device, rxa_w))
//MCFG_RS232_CTS_HANDLER (DEVWRITELINE ("scc", scc8030_device, ctsa_w))
MACHINE_CONFIG_END
ROM_START( c900 )
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 ) // 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 STATE INIT COMPANY FULLNAME FLAGS */
COMP( 1985, c900, 0, 0, c900, c900, c900_state, 0, "Commodore", "Commodore 900", MACHINE_IS_SKELETON )