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author Robbbert <Robbbert@users.noreply.github.com>2019-05-15 02:38:32 +1000
committer Robbbert <Robbbert@users.noreply.github.com>2019-05-15 02:38:32 +1000
commit0e685cc2e71511036e83834059de87f02bf93cf0 (patch)
treeb0c504bf84835ea98e4ec17f1a76e1e5a0c85e33
parent5f187d283d7c5b4582f11d1d5c350d78789edb35 (diff)
Microkit: Working machine. [Robbbert]
-rw-r--r--src/mame/drivers/microkit.cpp140
1 files changed, 94 insertions, 46 deletions
diff --git a/src/mame/drivers/microkit.cpp b/src/mame/drivers/microkit.cpp
index c57c2ceb475..dda3d5ed972 100644
--- a/src/mame/drivers/microkit.cpp
+++ b/src/mame/drivers/microkit.cpp
@@ -1,5 +1,5 @@
// license:BSD-3-Clause
-// copyright-holders:Curt Coder
+// copyright-holders:Curt Coder, Robbbert
/*
RCA COSMAC Microkit
@@ -7,36 +7,25 @@
http://www.vintagecomputer.net/browse_thread.cfm?id=511
Press CR or LF to get the * prompt.
- Commands:
+ Commands (must be in UPPERcase):
$Pxxxx - Jump to address xxxx
?Mxxxx yyyy - Dump memory starting at xxxx for yyyy bytes
- !Mxxxx yy zz... - Write data (yy etc) to memory xxxx. Data gets entered when you
- press the space after the data.
+ !Mxxxx yyzz... - Write data (yy etc) to memory xxxx onwards.
There's no sound or storage facilities, therefore no software.
- ToDo:
- - No technical manual or schematic available, so the entire driver is bodgy guesswork.
- - Address 0 needs to be read/writeable, otherwise the numbers you enter will get
- internally corrupted.
- - Address 8000 is IDL which hangs the system, so program counter is preset to 8001.
- - The keyboard is hooked up serially, which is ok, but the output to the terminal
- is rubbish, so parallel is used so you can at least see something.
- - When you enter commands, you can't see what you're doing.
- - When you enter numbers, they display as rubbish or act as control codes. They
- internally work though.
- - The computer looks like a rack-mount metal box with a rudimentary front panel.
- Buttons are: Reset; Load; Run program; Run Utility
- There is a RUN LED.
- None of these items are emulated.
- It also has a power switch and lamp, and a fuse.
+ The computer looks like a rack-mount metal box with a rudimentary front panel.
+ - Buttons are: Reset; Load; Run program; Run Utility
+ - There is a RUN LED.
+ - It also has a power switch and lamp, and a fuse.
+ - According to the schematic there are LEDs on every data, address and status line.
*****************************************************************************************/
#include "emu.h"
#include "cpu/cosmac/cosmac.h"
#include "bus/rs232/rs232.h"
-#include "machine/terminal.h"
+#include "machine/cdp1852.h"
class microkit_state : public driver_device
@@ -44,13 +33,18 @@ class microkit_state : public driver_device
public:
microkit_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
+ , m_a15(1)
, m_maincpu(*this, "maincpu")
+ , m_rom(*this, "maincpu")
, m_rs232(*this, "rs232")
- , m_terminal(*this, "terminal")
{ }
void microkit(machine_config &config);
+ DECLARE_INPUT_CHANGED_MEMBER(reset_button);
+ DECLARE_INPUT_CHANGED_MEMBER(runp_button);
+ DECLARE_INPUT_CHANGED_MEMBER(runu_button);
+
private:
DECLARE_READ_LINE_MEMBER(clear_r);
DECLARE_WRITE8_MEMBER(ram_w);
@@ -59,63 +53,106 @@ private:
void microkit_io(address_map &map);
void microkit_mem(address_map &map);
+ virtual void machine_start() override;
virtual void machine_reset() override;
+ std::unique_ptr<uint8_t[]> m_ram;
uint8_t m_resetcnt;
- uint8_t m_ram_data;
+ bool m_a15;
required_device<cosmac_device> m_maincpu;
+ required_memory_region m_rom;
required_device<rs232_port_device> m_rs232;
- required_device<generic_terminal_device> m_terminal;
};
void microkit_state::microkit_mem(address_map &map)
{
- map(0x0000, 0x0000).rw(FUNC(microkit_state::ram_r), FUNC(microkit_state::ram_w));
- map(0x8000, 0x81ff).rom().region("maincpu", 0);
- map(0x8200, 0x83ff).ram();
+ map(0x0000, 0x01ff).rw(FUNC(microkit_state::ram_r),FUNC(microkit_state::ram_w));
+ map(0x0200, 0x0fff).ram();
+ map(0x8000, 0x81ff).rom().region("maincpu", 0); // CDP1832.U2
+ map(0x8c00, 0x8c1f).ram(); // CDP1824.U3 "Register Storage"
}
void microkit_state::microkit_io(address_map &map)
{
- map(0x07, 0x07).nopw(); // writes a lots of zeros here
+ map(0x05, 0x05).r("u4", FUNC(cdp1852_device::read)).w("u4", FUNC(cdp1852_device::write)); // user output port
+ map(0x06, 0x06).r("u5", FUNC(cdp1852_device::read)).w("u5", FUNC(cdp1852_device::write)); // user input port
+ map(0x07, 0x07).nopw(); // writes lots of zeros here
}
static INPUT_PORTS_START( microkit )
+ PORT_START("RESET")
+ PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("RESET") PORT_CODE(KEYCODE_F3) PORT_CHANGED_MEMBER(DEVICE_SELF, microkit_state, reset_button, nullptr)
+ PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("RUN P") PORT_CODE(KEYCODE_F2) PORT_CHANGED_MEMBER(DEVICE_SELF, microkit_state, runp_button, nullptr)
+ PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("RUN U") PORT_CODE(KEYCODE_F1) PORT_CHANGED_MEMBER(DEVICE_SELF, microkit_state, runu_button, nullptr)
INPUT_PORTS_END
+INPUT_CHANGED_MEMBER(microkit_state::reset_button)
+{
+ m_maincpu->set_input_line(INPUT_LINE_RESET, newval ? ASSERT_LINE : CLEAR_LINE);
+ m_resetcnt = 0;
+}
+
+INPUT_CHANGED_MEMBER(microkit_state::runp_button)
+{
+ m_a15 = 0;
+ m_resetcnt = 0;
+ m_maincpu->set_input_line(INPUT_LINE_RESET, newval ? ASSERT_LINE : CLEAR_LINE);
+}
+
+INPUT_CHANGED_MEMBER(microkit_state::runu_button)
+{
+ m_a15 = 1;
+ m_resetcnt = 0;
+ m_maincpu->set_input_line(INPUT_LINE_RESET, newval ? ASSERT_LINE : CLEAR_LINE);
+}
+
READ_LINE_MEMBER( microkit_state::clear_r )
{
- if (m_resetcnt < 0x10)
- m_maincpu->set_state_int(cosmac_device::COSMAC_R0, 0x8001); // skip IDL
if (m_resetcnt < 0x20)
m_resetcnt++;
- // set reset pin to normal
- return 1;
+
+ if (m_resetcnt < 0x10)
+ return 0;
+ else
+ if (m_resetcnt == 0x1c)
+ m_a15 = 0;
+
+ return 1;
}
READ8_MEMBER( microkit_state::ram_r )
{
- return m_ram_data;
+ if (m_a15)
+ return m_rom->base()[offset];
+ else
+ return m_ram[offset];
}
WRITE8_MEMBER( microkit_state::ram_w )
{
- m_ram_data = data;
- if (data > 0 && data < 0x80)
- m_terminal->write(data);
+ m_ram[offset] = data;
}
void microkit_state::machine_reset()
{
m_resetcnt = 0;
- m_ram_data = 0;
+ m_maincpu->reset();
+}
+
+void microkit_state::machine_start()
+{
+ // Register save state
+ save_item(NAME(m_resetcnt));
+ save_item(NAME(m_a15));
+ m_ram = make_unique_clear<uint8_t[]>(0x200);
+ save_pointer(NAME(m_ram), 0x200);
}
static DEVICE_INPUT_DEFAULTS_START( serial_keyb )
DEVICE_INPUT_DEFAULTS( "RS232_TXBAUD", 0xff, RS232_BAUD_300 )
DEVICE_INPUT_DEFAULTS( "RS232_RXBAUD", 0xff, RS232_BAUD_300 )
DEVICE_INPUT_DEFAULTS( "RS232_STARTBITS", 0xff, RS232_STARTBITS_1 )
- DEVICE_INPUT_DEFAULTS( "RS232_DATABITS", 0xff, RS232_DATABITS_8 )
- DEVICE_INPUT_DEFAULTS( "RS232_PARITY", 0xff, RS232_PARITY_NONE )
+ DEVICE_INPUT_DEFAULTS( "RS232_DATABITS", 0xff, RS232_DATABITS_7 )
+ DEVICE_INPUT_DEFAULTS( "RS232_PARITY", 0xff, RS232_PARITY_MARK )
DEVICE_INPUT_DEFAULTS( "RS232_STOPBITS", 0xff, RS232_STOPBITS_2 )
DEVICE_INPUT_DEFAULTS_END
@@ -123,23 +160,34 @@ DEVICE_INPUT_DEFAULTS_END
void microkit_state::microkit(machine_config &config)
{
// basic machine hardware
- CDP1802(config, m_maincpu, 1750000);
+ CDP1802(config, m_maincpu, 2_MHz_XTAL);
m_maincpu->set_addrmap(AS_PROGRAM, &microkit_state::microkit_mem);
m_maincpu->set_addrmap(AS_IO, &microkit_state::microkit_io);
m_maincpu->wait_cb().set_constant(1);
m_maincpu->clear_cb().set(FUNC(microkit_state::clear_r));
+ m_maincpu->q_cb().set(m_rs232, FUNC(rs232_port_device::write_txd)).invert();
/* video hardware */
- RS232_PORT(config, m_rs232, default_rs232_devices, "keyboard");
+ RS232_PORT(config, m_rs232, default_rs232_devices, "terminal");
m_rs232->rxd_handler().set_inputline(m_maincpu, COSMAC_INPUT_LINE_EF4);
- m_rs232->set_option_device_input_defaults("keyboard", DEVICE_INPUT_DEFAULTS_NAME(serial_keyb));
- GENERIC_TERMINAL(config, m_terminal, 0);
+ m_rs232->set_option_device_input_defaults("terminal", DEVICE_INPUT_DEFAULTS_NAME(serial_keyb));
+
+ cdp1852_device &u4(CDP1852(config, "u4"));
+ u4.mode_cb().set_constant(1); // output
+
+ cdp1852_device &u5(CDP1852(config, "u5"));
+ u5.mode_cb().set_constant(0); // input
}
ROM_START( microkit )
- ROM_REGION( 0x200, "maincpu", ROMREGION_INVERT )
- ROM_LOAD( "3.2b", 0x000, 0x100, CRC(6799357e) SHA1(c46e3322b8b1b6534a7da04806be29fa265951b7) )
- ROM_LOAD( "4.2a", 0x100, 0x100, CRC(27267bad) SHA1(838df9be2dc175584a1a6ee1770039118e49482e) )
+ ROM_REGION( 0x200, "maincpu", 0 )
+ ROM_LOAD( "ut4.u2", 0x0000, 0x0200, CRC(ba642f8e) SHA1(8975a4c6a0bb699b53c753946aac54860054246a) )
+
+ // These are bad, with heaps of bugs
+ //ROM_REGION( 0x200, "maincpu", ROMREGION_INVERT )
+ //ROM_LOAD( "3.2b", 0x000, 0x100, CRC(6799357e) SHA1(c46e3322b8b1b6534a7da04806be29fa265951b7) )
+ //ROM_LOAD( "4.2a", 0x100, 0x100, CRC(27267bad) SHA1(838df9be2dc175584a1a6ee1770039118e49482e) )
+
ROM_END
-COMP( 1975, microkit, 0, 0, microkit, microkit, microkit_state, empty_init, "RCA", "COSMAC Microkit", MACHINE_IS_SKELETON )
+COMP( 1975, microkit, 0, 0, microkit, microkit, microkit_state, empty_init, "RCA", "COSMAC Microkit", MACHINE_SUPPORTS_SAVE )