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mame/src/mess/drivers/electron.c

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/******************************************************************************
Acorn Electron driver
MESS Driver By:
Wilbert Pol
I don't have a real system to verify the behaviour of the emulation. The things
that can be done through BASIC programs seem to behave properly (most of the time :).
Incomplete:
- Sound (sound is too high?)
- Graphics (seems to be wrong for several games)
- 1 MHz bus is not emulated
- Bus claiming by ULA is not implemented
- Currently the cartridge support always loads the upper rom in page 12
and the lower rom in page 0. This might need further documentation in
the software list and loading code.
Missing:
- Support for floppy disks
- Other peripherals
- Keyboard is missing the 'Break' key
******************************************************************************/
#include "emu.h"
#include "cpu/m6502/m6502.h"
#include "includes/electron.h"
#include "imagedev/cassette.h"
#include "imagedev/cartslot.h"
#include "formats/uef_cas.h"
#include "sound/beep.h"
static const rgb_t electron_palette[8]=
{
MAKE_RGB(0x0ff,0x0ff,0x0ff),
MAKE_RGB(0x000,0x0ff,0x0ff),
MAKE_RGB(0x0ff,0x000,0x0ff),
MAKE_RGB(0x000,0x000,0x0ff),
MAKE_RGB(0x0ff,0x0ff,0x000),
MAKE_RGB(0x000,0x0ff,0x000),
MAKE_RGB(0x0ff,0x000,0x000),
MAKE_RGB(0x000,0x000,0x000)
};
void electron_state::palette_init()
{
palette_set_colors(machine(), 0, electron_palette, ARRAY_LENGTH(electron_palette));
}
static ADDRESS_MAP_START(electron_mem, AS_PROGRAM, 8, electron_state )
AM_RANGE(0x0000, 0x7fff) AM_RAM AM_REGION("maincpu", 0x00000) /* 32KB of RAM */
AM_RANGE(0x8000, 0xbfff) AM_ROMBANK("bank2") /* Banked ROM pages */
AM_RANGE(0xc000, 0xfbff) AM_ROM AM_REGION("user1", 0x40000) /* OS ROM */
AM_RANGE(0xfc00, 0xfcff) AM_READWRITE(electron_jim_r, electron_jim_w ) /* JIM pages */
AM_RANGE(0xfd00, 0xfdff) AM_READWRITE(electron_1mhz_r, electron_1mhz_w ) /* 1 MHz bus */
AM_RANGE(0xfe00, 0xfeff) AM_READWRITE(electron_ula_r, electron_ula_w ) /* Electron ULA */
AM_RANGE(0xff00, 0xffff) AM_ROM AM_REGION("user1", 0x43f00) /* OS ROM continued */
ADDRESS_MAP_END
static INPUT_PORTS_START( electron )
PORT_START("LINE0") /* Keyboard line 0 */
PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("\xE2\x86\x92 | \\") PORT_CODE(KEYCODE_BACKSLASH) PORT_CHAR(UCHAR_MAMEKEY(RIGHT)) PORT_CHAR('|') PORT_CHAR('\\') // on the real keyboard, this would be on the 1st row, the 3rd key after 0
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("COPY") PORT_CODE(KEYCODE_END) PORT_CHAR(UCHAR_MAMEKEY(F1)) PORT_CHAR('[') PORT_CHAR(']')
/* PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("<NONE>") PORT_CODE(KEYCODE_) */
PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_SPACE) PORT_CHAR(' ')
PORT_START("LINE1") /* Keyboard line 1 */
PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("\xE2\x86\x90 ^ ~") PORT_CODE(KEYCODE_EQUALS) PORT_CHAR(UCHAR_MAMEKEY(LEFT)) PORT_CHAR('^') PORT_CHAR('~')
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("\xE2\x86\x93 _ }") PORT_CODE(KEYCODE_CLOSEBRACE) PORT_CHAR(UCHAR_MAMEKEY(DOWN)) PORT_CHAR('_') PORT_CHAR('}')
PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_ENTER) PORT_CHAR(13)
PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("DELETE") PORT_CODE(KEYCODE_BACKSPACE) PORT_CHAR(8)
PORT_START("LINE2") /* Keyboard line 2 */
PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_MINUS) PORT_CHAR('-') PORT_CHAR('=')
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("\xE2\x86\x91 \xC2\xA3 {") PORT_CODE(KEYCODE_OPENBRACE) PORT_CHAR(UCHAR_MAMEKEY(UP)) PORT_CHAR('\xA3') PORT_CHAR('{')
PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_QUOTE) PORT_CHAR(':') PORT_CHAR('*')
/* PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("<NONE>") PORT_CODE(KEYCODE_) */
PORT_START("LINE3") /* Keyboard line 3 */
PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_0) PORT_CHAR('0') PORT_CHAR('@')
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_P) PORT_CHAR('p') PORT_CHAR('P')
PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_COLON) PORT_CHAR(';') PORT_CHAR('+')
PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_SLASH) PORT_CHAR('/') PORT_CHAR('?')
PORT_START("LINE4") /* Keyboard line 4 */
PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_9) PORT_CHAR('9') PORT_CHAR(')')
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_O) PORT_CHAR('o') PORT_CHAR('O')
PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_L) PORT_CHAR('l') PORT_CHAR('L')
PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_STOP) PORT_CHAR('.') PORT_CHAR('>')
PORT_START("LINE5") /* Keyboard line 5 */
PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_8) PORT_CHAR('8') PORT_CHAR('(')
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_I) PORT_CHAR('i') PORT_CHAR('I')
PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_K) PORT_CHAR('k') PORT_CHAR('K')
PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_COMMA) PORT_CHAR(',') PORT_CHAR('<')
PORT_START("LINE6") /* Keyboard line 6 */
PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_7) PORT_CHAR('7') PORT_CHAR('\'')
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_U) PORT_CHAR('u') PORT_CHAR('U')
PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_J) PORT_CHAR('j') PORT_CHAR('J')
PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_M) PORT_CHAR('m') PORT_CHAR('M')
PORT_START("LINE7") /* Keyboard line 7 */
PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_6) PORT_CHAR('6') PORT_CHAR('&')
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_Y) PORT_CHAR('y') PORT_CHAR('Y')
PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_H) PORT_CHAR('h') PORT_CHAR('H')
PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_N) PORT_CHAR('n') PORT_CHAR('N')
PORT_START("LINE8") /* Keyboard line 8 */
PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_5) PORT_CHAR('5') PORT_CHAR('%')
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_T) PORT_CHAR('t') PORT_CHAR('T')
PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_G) PORT_CHAR('g') PORT_CHAR('G')
PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_B) PORT_CHAR('b') PORT_CHAR('B')
PORT_START("LINE9") /* Keyboard line 9 */
PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_4) PORT_CHAR('4') PORT_CHAR('$')
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_R) PORT_CHAR('r') PORT_CHAR('R')
PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_F) PORT_CHAR('f') PORT_CHAR('F')
PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_V) PORT_CHAR('v') PORT_CHAR('V')
PORT_START("LINE10") /* Keyboard line 10 */
PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_3) PORT_CHAR('3') PORT_CHAR('#')
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_E) PORT_CHAR('e') PORT_CHAR('E')
PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_D) PORT_CHAR('d') PORT_CHAR('D')
PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_C) PORT_CHAR('c') PORT_CHAR('C')
PORT_START("LINE11") /* Keyboard line 11 */
PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_2) PORT_CHAR('2') PORT_CHAR('"')
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_W) PORT_CHAR('w') PORT_CHAR('W')
PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_S) PORT_CHAR('s') PORT_CHAR('S')
PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_X) PORT_CHAR('x') PORT_CHAR('X')
PORT_START("LINE12") /* Keyboard line 12 */
PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_1) PORT_CHAR('1') PORT_CHAR('!')
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_Q) PORT_CHAR('q') PORT_CHAR('Q')
PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_A) PORT_CHAR('a') PORT_CHAR('A')
PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_Z) PORT_CHAR('z') PORT_CHAR('Z')
PORT_START("LINE13") /* Keyboard line 13 */
PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("ESCAPE") PORT_CODE(KEYCODE_ESC) PORT_CHAR(UCHAR_MAMEKEY(ESC))
PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("FUNC") PORT_CODE(KEYCODE_TAB) PORT_CHAR(UCHAR_MAMEKEY(LALT))
PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_LCONTROL) PORT_CODE(KEYCODE_RCONTROL) PORT_CHAR(UCHAR_SHIFT_2)
PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_RSHIFT) PORT_CODE(KEYCODE_LSHIFT) PORT_CHAR(UCHAR_SHIFT_1)
INPUT_PORTS_END
/* Electron Rom Load */
ROM_START(electron)
ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
ROM_REGION( 0x44000, "user1", 0 ) /* OS Rom */
ROM_LOAD( "os.rom", 0x40000, 0x4000, CRC(bf63fb1f) SHA1(a48b8fa0cfb09140e808ac8a187316c605a0b32e) ) /* Os rom */
/* 00000 0 available for cartridges */
/* 04000 1 available for cartridges */
/* 08000 2 available for cartridges */
/* 0c000 3 available for cartridges */
/* 10000 4 available for cartridges */
/* 14000 5 available for cartridges */
/* 18000 6 available for cartridges */
/* 1c000 7 available for cartridges */
/* 20000 8 keyboard */
/* 24000 9 keyboard mirror */
/* 28000 10 Basic rom */ ROM_LOAD( "basic.rom", 0x28000, 0x4000, CRC(79434781) SHA1(4a7393f3a45ea309f744441c16723e2ef447a281) )
/* 2c000 11 Basic rom mirror */ ROM_COPY( "user1", 0x28000, 0x2c000, 0x4000 )
/* 30000 12 available for cartridges with a language ROM */
/* 34000 13 available for cartridges with a language ROM */
/* 38000 14 available for cartridges with a language ROM */
/* 3c000 15 available for cartridges with a language ROM */
ROM_END
static const cassette_interface electron_cassette_interface =
{
uef_cassette_formats,
NULL,
(cassette_state)(CASSETTE_PLAY),
NULL,
NULL
};
static MACHINE_CONFIG_START( electron, electron_state )
MCFG_CPU_ADD( "maincpu", M6502, 2000000 )
MCFG_CPU_PROGRAM_MAP( electron_mem)
MCFG_SCREEN_ADD("screen", RASTER)
MCFG_SCREEN_REFRESH_RATE( 50.08 )
MCFG_SCREEN_SIZE( 640, 312 )
MCFG_SCREEN_VISIBLE_AREA( 0, 640-1, 0, 256-1 )
MCFG_SCREEN_UPDATE_DRIVER(electron_state, screen_update_electron)
MCFG_PALETTE_LENGTH( 16 )
MCFG_VIDEO_ATTRIBUTES(VIDEO_UPDATE_SCANLINE)
MCFG_SPEAKER_STANDARD_MONO( "mono" )
MCFG_SOUND_ADD( "beeper", BEEP, 0 )
MCFG_SOUND_ROUTE( ALL_OUTPUTS, "mono", 1.00 )
MCFG_CASSETTE_ADD( "cassette", electron_cassette_interface )
MCFG_CARTSLOT_ADD("cart")
MCFG_CARTSLOT_EXTENSION_LIST("bin")
MCFG_CARTSLOT_NOT_MANDATORY
MCFG_CARTSLOT_LOAD(electron_state, electron_cart)
MCFG_CARTSLOT_INTERFACE("electron_cart")
/* software lists */
MCFG_SOFTWARE_LIST_ADD("cart_list","electron_cart")
MACHINE_CONFIG_END
/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME */
COMP ( 1983, electron, 0, 0, electron, electron, driver_device, 0, "Acorn", "Acorn Electron", GAME_IMPERFECT_SOUND | GAME_IMPERFECT_GRAPHICS )
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