Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-10-06 09:00:04 +03:00
Code Issues Actions 3 Packages Projects Releases Wiki Activity

Microkit: Working machine. [Robbbert]

Browse Source
This commit is contained in:
Robbbert 2019-05-15 02:38:32 +10:00
parent 5f187d283d
commit 0e685cc2e7
1 changed files with 94 additions and 46 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

140
src/mame/drivers/microkit.cpp
View File

@ -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 )