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meritum.cpp: Add RS232 interface (nw)

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This commit is contained in:
AJR 2018-07-20 12:14:12 -04:00
parent abc6df767a
commit 14305da9ca
1 changed files with 24 additions and 3 deletions
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27
src/mame/drivers/meritum.cpp
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@ -36,10 +36,14 @@ perhaps III:
- Add 4-colour mode, 4 shades of grey mode, and 512x192 monochrome.
****************************************************************************/
#include "emu.h"
#include "cpu/z80/z80.h"
#include "imagedev/cassette.h"
#include "imagedev/snapquik.h"
#include "bus/rs232/rs232.h"
#include "machine/i8251.h"
#include "machine/pit8253.h"
#include "sound/spkrdev.h"
#include "sound/wave.h"
#include "screen.h"
@ -103,8 +107,9 @@ void meritum_state::io_map(address_map &map)
// map(0x00, 0x03).rw 8253-2 (optional audio interface?)
// map(0xf0, 0xf3).rw 8255-2 (floppy disk interface)
// map(0xf4, 0xf7).rw 8255-1 (parallel interface)
// map(0xf8, 0xfb).rw 8253-1 (nmi, int, baud pulse generators)
// map(0xfc, 0xfd).rw 8251 (RS-232)
map(0xf8, 0xfb).rw("mainpit", FUNC(pit8253_device::read), FUNC(pit8253_device::write));
map(0xfc, 0xfc).rw("usart", FUNC(i8251_device::data_r), FUNC(i8251_device::data_w));
map(0xfd, 0xfd).rw("usart", FUNC(i8251_device::status_r), FUNC(i8251_device::control_w));
// map(0xfe, 0xfe) audio interface
map(0xff, 0xff).rw(FUNC(meritum_state::port_ff_r), FUNC(meritum_state::port_ff_w));
}
@ -386,10 +391,26 @@ GFXDECODE_END
MACHINE_CONFIG_START(meritum_state::meritum)
/* basic machine hardware */
MCFG_DEVICE_ADD("maincpu", Z80, 10_MHz_XTAL / 4) // 2.5 MHz or 1.67 MHz by jumper selection
MCFG_DEVICE_ADD("maincpu", Z80, 10_MHz_XTAL / 4) // U880D @ 2.5 MHz or 1.67 MHz by jumper selection
MCFG_DEVICE_PROGRAM_MAP(mem_map)
MCFG_DEVICE_IO_MAP(io_map)
MCFG_DEVICE_ADD("usart", I8251, 10_MHz_XTAL / 4) // same as CPU clock
MCFG_I8251_TXD_HANDLER(WRITELINE("rs232", rs232_port_device, write_txd))
MCFG_DEVICE_ADD("rs232", RS232_PORT, default_rs232_devices, nullptr)
MCFG_RS232_RXD_HANDLER(WRITELINE("usart", i8251_device, write_rxd))
MCFG_RS232_CTS_HANDLER(WRITELINE("usart", i8251_device, write_cts))
pit8253_device &pit(PIT8253(config, "mainpit", 0));
pit.set_clk<0>(10_MHz_XTAL / 5); // 2 MHz
pit.set_clk<1>(10_MHz_XTAL / 10); // 1 MHz
pit.set_clk<2>(10_MHz_XTAL / 4); // same as CPU clock
pit.out_handler<0>().set("usart", FUNC(i8251_device::write_txc));
pit.out_handler<0>().append("usart", FUNC(i8251_device::write_rxc));
// Channel 1 generates INT pulse through 123 monostable
// Channel 2 (gated) generates NMI
/* video hardware */
MCFG_SCREEN_ADD("screen", RASTER)
MCFG_SCREEN_RAW_PARAMS(10_MHz_XTAL, 672, 0, 384, 264, 0, 192) // wrong