summaryrefslogtreecommitdiffstatshomepage
path: root/src/mess/drivers/astrocde.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/mess/drivers/astrocde.c')
-rw-r--r--src/mess/drivers/astrocde.c395
1 files changed, 395 insertions, 0 deletions
diff --git a/src/mess/drivers/astrocde.c b/src/mess/drivers/astrocde.c
new file mode 100644
index 00000000000..84876c5e470
--- /dev/null
+++ b/src/mess/drivers/astrocde.c
@@ -0,0 +1,395 @@
+/****************************************************************************
+
+ Bally Astrocade consumer hardware
+ driver by Nicola Salmoria, Mike Coates, Frank Palazzolo, Aaron Giles,
+ Dirk Best
+
+****************************************************************************/
+
+#include "emu.h"
+#include "cpu/z80/z80.h"
+#include "includes/astrocde.h"
+#include "sound/astrocde.h"
+#include "imagedev/cartslot.h"
+#include "machine/ram.h"
+
+MACHINE_RESET( astrocde );
+void get_ram_expansion_settings(address_space *space, int &ram_expansion_installed, int &write_protect_on, int &expansion_ram_start, int &expansion_ram_end, int &shadow_ram_end);
+
+/*************************************
+ *
+ * Memory maps
+ *
+ * $0000 to $1FFF: 8K on-board ROM (could be one of three available BIOS dumps)
+ * $2000 to $3FFF: 8K cartridge ROM
+ * $4000 to $4FFF: 4K screen RAM
+ * $5000 to $FFFF: 44K address space not available in standard machine. With a
+ * sufficiently large RAM expansion, all of this RAM can be added, and accessed
+ * by an extended BASIC program. Bally and Astrocade BASIC can access from
+ * $5000 to $7FFF if available.
+ *
+ * RAM Expansions
+ *
+ * Several third party RAM expansions have been made for the Astrocade. These
+ * allow access to various ranges of the expansion memory ($5000 to $FFFF).
+ * A RAM expansion is required to use extended BASIC programs like Blue RAM BASIC
+ * and VIPERSoft BASIC. All of the expansions also have a RAM protect switch, which
+ * can be flipped at any time to make the RAM act like ROM. Extended BASIC
+ * programs need access to the RAM and won't work with RAM protect enabled, but
+ * this can be useful with Bally and Astrocade BASIC. They also have a range switch
+ * (not implemented). The default position is 6K, but it can be switched to
+ * 2K. This means that the expanded memory starting at $6000 will instead be
+ * mapped to the cartridge memory starting at $2000. So it would be possible to
+ * load a cartridge program from tape into the expansion memory, then flip the range
+ * switch and run it as a cartridge. This is useful for cartridge development.
+ *
+ * NOTE: If you have any trouble running cartridges with a RAM expansion installed, hit reset.
+ *
+ * Blue RAM -- available in 4K, 16K, and 32K. These also use an INS8154 chip,
+ * (not yet implemented) which has an additional $80 bytes of RAM mapped
+ * immediately after the end of the expansion address space. This memory
+ * can't be write protected. The INS8154 has I/O features needed for loading
+ * tape programs into Blue RAM BASIC, as well as running the Blue RAM Utility cart.
+ * 4K: $6000 to $6FFF (can't run VIPERSoft BASIC, because this program needs memory
+ * past this range)
+ * 16K: $6000 to $9FFF
+ * 32K: $6000 to $DFFF
+ *
+ * VIPER System 1 -- This is available in 16K only. It also includes a keyboard (not implemented).
+ * 16K: $6000 to $9FFF
+ *
+ * Lil' WHITE RAM -- This is available in 32K only. Attempts to read and write
+ * to memory outside of its address range ($D000 to $FFFF) are mapped to the expansion
+ * memory $5000 to $7FFF. The current implementation won't allow the shadow RAM area
+ * to be accessed when RAM protect is on, but there is no known software that will
+ * access the upper range of the expansion RAM when RAM protect is enabled.
+ * 32K: $5000 to $CFFF
+ *
+ * R&L 64K RAM Board -- This is a highly configurable kit. RAM can be installed in
+ * 2K increments. So, the entire 44K expansion memory can be filled. It is also
+ * possible to override the rest of the memory map with RAM (not implemented).
+ * There are 32 switches allowing users to activate and deactivate each 2K block (not implemented).
+ * RAM write protection can be implemented in three ranges through jumpers or by
+ * installing switches. The ranges are $0000 to $0FFF (first 4K), $0000 to $3FFF (first 16K),
+ * and $0000 to $FFFF (all 64K). The current implementation is for 44K expansion memory mapped from
+ * $5000 to $FFFF, with only a single write protect covering this entire range.
+ *
+ *************************************/
+
+static ADDRESS_MAP_START( astrocade_mem, AS_PROGRAM, 8, astrocde_state )
+ AM_RANGE(0x0000, 0x0fff) AM_ROM AM_WRITE(astrocade_funcgen_w)
+ AM_RANGE(0x1000, 0x3fff) AM_ROM /* Star Fortress writes in here?? */
+ AM_RANGE(0x4000, 0x4fff) AM_RAM AM_SHARE("videoram") /* ASG */
+ADDRESS_MAP_END
+
+
+static ADDRESS_MAP_START( astrocade_io, AS_IO, 8, astrocde_state )
+ AM_RANGE(0x00, 0x1f) AM_MIRROR(0xff00) AM_MASK(0xffff) AM_READWRITE(astrocade_data_chip_register_r, astrocade_data_chip_register_w)
+ADDRESS_MAP_END
+
+static INPUT_CHANGED( set_write_protect ) // run when RAM expansion write protect switch is changed
+{
+ int ram_expansion_installed = 0, write_protect_on = 0, expansion_ram_start = 0, expansion_ram_end = 0, shadow_ram_end = 0;
+ address_space *space = field.machine().device("maincpu")->memory().space(AS_PROGRAM);
+ UINT8 *expram = field.machine().device<ram_device>("ram_tag")->pointer();
+
+ get_ram_expansion_settings(space, ram_expansion_installed, write_protect_on, expansion_ram_start, expansion_ram_end, shadow_ram_end); // passing by reference
+
+ if (ram_expansion_installed == 1)
+ {
+ if (write_protect_on == 0) // write protect off, so install memory normally
+ {
+ space->install_ram(expansion_ram_start, expansion_ram_end, expram);
+ if (shadow_ram_end > expansion_ram_end)
+ space->install_ram(expansion_ram_end + 1, shadow_ram_end, expram);
+ }
+ else // write protect on, so make memory read only
+ {
+ space->nop_write(expansion_ram_start, expansion_ram_end);
+ }
+ }
+}
+
+/*************************************
+ *
+ * Input ports
+ *
+ *
+ * The Astrocade has ports for four hand controllers. Each controller has a
+ * knob on top that can be simultaneously pushed as an eight-way joystick and
+ * twisted as a paddle, in addition to a trigger button. The knob can twist
+ * through about 270 degrees, registering 256 unique positions. It does not
+ * autocenter. When selecting options on the menu, twisting the knob to the
+ * right gives lower numbers, and twisting to the left gives larger numbers.
+ * Paddle games like Clowns have more intuitive behavior -- twisting to the
+ * right moves the character right.
+ *
+ * There is a 24-key keypad on the system itself (6 rows, 4 columns). It is
+ * labeled for the built-in calculator, but overlays were released for other
+ * programs, the most popular being the BASIC cartridges, which allowed a
+ * large number of inputs by making the bottom row shift buttons. The labels
+ * below first list the calculator key, then the BASIC keys in the order of no
+ * shift, GREEN shift, RED shift, BLUE shift, WORDS shift.
+ *
+ *************************************/
+
+static INPUT_PORTS_START( astrocde )
+ PORT_START("P1HANDLE")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP) PORT_PLAYER(1) PORT_8WAY
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN) PORT_PLAYER(1) PORT_8WAY
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT) PORT_PLAYER(1) PORT_8WAY
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT) PORT_PLAYER(1) PORT_8WAY
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_BUTTON1) PORT_PLAYER(1)
+ PORT_BIT(0xe0, IP_ACTIVE_HIGH, IPT_UNUSED)
+
+ PORT_START("P2HANDLE")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP) PORT_PLAYER(2) PORT_8WAY
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN) PORT_PLAYER(2) PORT_8WAY
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT) PORT_PLAYER(2) PORT_8WAY
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT) PORT_PLAYER(2) PORT_8WAY
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_BUTTON1) PORT_PLAYER(2)
+ PORT_BIT(0xe0, IP_ACTIVE_HIGH, IPT_UNUSED)
+
+ PORT_START("P3HANDLE")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP) PORT_PLAYER(3) PORT_8WAY
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN) PORT_PLAYER(3) PORT_8WAY
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT) PORT_PLAYER(3) PORT_8WAY
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT) PORT_PLAYER(3) PORT_8WAY
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_BUTTON1) PORT_PLAYER(3)
+ PORT_BIT(0xe0, IP_ACTIVE_HIGH, IPT_UNUSED)
+
+ PORT_START("P4HANDLE")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_JOYSTICK_UP) PORT_PLAYER(4) PORT_8WAY
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_JOYSTICK_DOWN) PORT_PLAYER(4) PORT_8WAY
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_JOYSTICK_LEFT) PORT_PLAYER(4) PORT_8WAY
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_JOYSTICK_RIGHT) PORT_PLAYER(4) PORT_8WAY
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_BUTTON1) PORT_PLAYER(4)
+ PORT_BIT(0xe0, IP_ACTIVE_HIGH, IPT_UNUSED)
+
+ PORT_START("KEYPAD0")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("% \xC3\xB7 [ ] LIST") PORT_CODE(KEYCODE_O)
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("/ x J K L NEXT") PORT_CODE(KEYCODE_SLASH_PAD)
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("x - V W X IF") PORT_CODE(KEYCODE_ASTERISK)
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("- + & @ * GOTO") PORT_CODE(KEYCODE_MINUS_PAD)
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("+ = # % : PRINT") PORT_CODE(KEYCODE_PLUS_PAD)
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("= WORDS Shift") PORT_CODE(KEYCODE_ENTER_PAD)
+ PORT_BIT(0xc0, IP_ACTIVE_HIGH, IPT_UNUSED )
+
+ PORT_START("KEYPAD1")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("\xE2\x86\x93 HALT RUN") PORT_CODE(KEYCODE_PGDN)
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("CH 9 G H I STEP") PORT_CODE(KEYCODE_H)
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("9 6 S T U RND") PORT_CODE(KEYCODE_9)
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("6 3 \xE2\x86\x91 . \xE2\x86\x93 BOX") PORT_CODE(KEYCODE_6)
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("3 ERASE ( ; )") PORT_CODE(KEYCODE_3)
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME(". BLUE Shift") PORT_CODE(KEYCODE_STOP)
+ PORT_BIT(0xc0, IP_ACTIVE_HIGH, IPT_UNUSED)
+
+ PORT_START("KEYPAD2")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("\xE2\x86\x91 PAUSE / \\") PORT_CODE(KEYCODE_PGUP)
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("MS 8 D E F TO") PORT_CODE(KEYCODE_S)
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("8 5 P Q R RETN") PORT_CODE(KEYCODE_8)
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("5 2 \xE2\x86\x90 ' \xE2\x86\x92 LINE") PORT_CODE(KEYCODE_5)
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("2 0 < \" > INPUT") PORT_CODE(KEYCODE_2)
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("0 RED Shift") PORT_CODE(KEYCODE_0)
+ PORT_BIT(0xc0, IP_ACTIVE_HIGH, IPT_UNUSED)
+
+ PORT_START("KEYPAD3")
+ PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("C GO +10") PORT_CODE(KEYCODE_C)
+ PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("MR 7 A B C FOR") PORT_CODE(KEYCODE_R)
+ PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("7 4 M N O GOSB") PORT_CODE(KEYCODE_7)
+ PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("4 1 Y Z ! CLEAR") PORT_CODE(KEYCODE_4)
+ PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("1 SPACE $ , ?") PORT_CODE(KEYCODE_1)
+ PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYPAD) PORT_NAME("CE GREEN Shift") PORT_CODE(KEYCODE_E)
+ PORT_BIT(0xc0, IP_ACTIVE_HIGH, IPT_UNUSED)
+
+ PORT_START("P1_KNOB")
+ PORT_BIT(0xff, 0x00, IPT_PADDLE) PORT_INVERT PORT_SENSITIVITY(85) PORT_KEYDELTA(10) PORT_CENTERDELTA(0) PORT_MINMAX(0,255) PORT_CODE_DEC(KEYCODE_Z) PORT_CODE_INC(KEYCODE_X) PORT_PLAYER(1)
+
+ PORT_START("P2_KNOB")
+ PORT_BIT(0xff, 0x00, IPT_PADDLE) PORT_INVERT PORT_SENSITIVITY(85) PORT_KEYDELTA(10) PORT_CENTERDELTA(0) PORT_MINMAX(0,255) PORT_CODE_DEC(KEYCODE_N) PORT_CODE_INC(KEYCODE_M) PORT_PLAYER(2)
+
+ PORT_START("P3_KNOB")
+ PORT_BIT(0xff, 0x00, IPT_PADDLE) PORT_INVERT PORT_SENSITIVITY(85) PORT_KEYDELTA(10) PORT_CENTERDELTA(0) PORT_MINMAX(0,255) PORT_CODE_DEC(KEYCODE_Q) PORT_CODE_INC(KEYCODE_W) PORT_PLAYER(3)
+
+ PORT_START("P4_KNOB")
+ PORT_BIT(0xff, 0x00, IPT_PADDLE) PORT_INVERT PORT_SENSITIVITY(85) PORT_KEYDELTA(10) PORT_CENTERDELTA(0) PORT_MINMAX(0,255) PORT_CODE_DEC(KEYCODE_Y) PORT_CODE_INC(KEYCODE_U) PORT_PLAYER(4)
+
+ PORT_START("CFG") /* machine config */
+ PORT_DIPNAME( 0x3f, 0x00, "RAM Expansion")
+ PORT_DIPSETTING( 0x00, "No RAM Expansion")
+ PORT_DIPSETTING( 0x01, "16KB Viper System 1 RAM Expansion")
+ PORT_DIPSETTING( 0x02, "32KB Lil' WHITE RAM Expansion")
+ PORT_DIPSETTING( 0x04, "R&L 64K RAM Board (44K installed)")
+ PORT_DIPSETTING( 0x08, "4KB Blue RAM Expansion")
+ PORT_DIPSETTING( 0x10, "16KB Blue RAM Expansion")
+ PORT_DIPSETTING( 0x20, "32KB Blue RAM Expansion")
+
+ PORT_START("PROTECT") /* Write protect RAM */
+ PORT_DIPNAME( 0x01, 0x00, "Write Protect RAM") PORT_CHANGED(set_write_protect, 0)
+ PORT_DIPSETTING( 0x00, "Write Protect Off")
+ PORT_DIPSETTING( 0x01, "Write Protect On")
+INPUT_PORTS_END
+
+
+/*************************************
+ *
+ * Machine drivers
+ *
+ *************************************/
+
+static MACHINE_CONFIG_START( astrocde, astrocde_state )
+ /* basic machine hardware */
+ MCFG_CPU_ADD("maincpu", Z80, ASTROCADE_CLOCK/4) /* 1.789 MHz */
+ MCFG_CPU_PROGRAM_MAP(astrocade_mem)
+ MCFG_CPU_IO_MAP(astrocade_io)
+
+ MCFG_MACHINE_RESET( astrocde )
+
+ /* video hardware */
+ MCFG_SCREEN_ADD("screen", RASTER)
+ MCFG_SCREEN_RAW_PARAMS(ASTROCADE_CLOCK, 455, 0, 352, 262, 0, 240)
+ MCFG_SCREEN_UPDATE_STATIC(astrocde)
+
+ MCFG_PALETTE_LENGTH(512)
+ MCFG_PALETTE_INIT(astrocde)
+
+ MCFG_VIDEO_START(astrocde)
+
+ /* sound hardware */
+ MCFG_SPEAKER_STANDARD_MONO("mono")
+ MCFG_SOUND_ADD("astrocade1", ASTROCADE, ASTROCADE_CLOCK/4)
+ MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.00)
+
+ /* optional expansion ram (installed in MACHINE_RESET)*/
+ MCFG_RAM_ADD("ram_tag")
+ MCFG_RAM_DEFAULT_SIZE("32k")
+
+ /* cartridge */
+ MCFG_CARTSLOT_ADD("cart")
+ MCFG_CARTSLOT_EXTENSION_LIST("bin")
+ MCFG_CARTSLOT_INTERFACE("astrocde_cart")
+
+ /* Software lists */
+ MCFG_SOFTWARE_LIST_ADD("cart_list","astrocde")
+MACHINE_CONFIG_END
+
+
+/*************************************
+ *
+ * ROM definitions
+ *
+ *************************************/
+
+ROM_START( astrocde )
+ ROM_REGION( 0x10000, "maincpu", 0 )
+ ROM_LOAD( "astro.bin", 0x0000, 0x2000, CRC(ebc77f3a) SHA1(b902c941997c9d150a560435bf517c6a28137ecc) )
+ ROM_CART_LOAD( "cart", 0x2000, 0x8000, 0 )
+ROM_END
+
+ROM_START( astrocdl )
+ ROM_REGION( 0x10000, "maincpu", 0 )
+ ROM_LOAD( "ballyhlc.bin", 0x0000, 0x2000, CRC(d7c517ba) SHA1(6b2bef5d970e54ed204549f58ba6d197a8bfd3cc) )
+ ROM_CART_LOAD( "cart", 0x2000, 0x8000, 0 )
+ROM_END
+
+ROM_START( astrocdw )
+ ROM_REGION( 0x10000, "maincpu", 0 )
+ ROM_LOAD( "bioswhit.bin", 0x0000, 0x2000, CRC(6eb53e79) SHA1(d84341feec1a0a0e8aa6151b649bc3cf6ef69fbf) )
+ ROM_CART_LOAD( "cart", 0x2000, 0x8000, 0 )
+ROM_END
+
+/*************************************
+ *
+ * Driver initialization
+ *
+ *************************************/
+
+DRIVER_INIT_MEMBER(astrocde_state,astrocde)
+{
+ m_video_config = AC_SOUND_PRESENT | AC_LIGHTPEN_INTS;
+}
+
+MACHINE_RESET( astrocde )
+{
+ int ram_expansion_installed = 0, write_protect_on = 0, expansion_ram_start = 0, expansion_ram_end = 0, shadow_ram_end = 0;
+ address_space *space = machine.device("maincpu")->memory().space(AS_PROGRAM);
+ UINT8 *expram = machine.device<ram_device>("ram_tag")->pointer();
+ space->unmap_readwrite(0x5000, 0xffff); // unmap any previously installed expansion RAM
+
+ get_ram_expansion_settings(space, ram_expansion_installed, write_protect_on, expansion_ram_start, expansion_ram_end, shadow_ram_end); // passing by reference
+
+ if (ram_expansion_installed == 1)
+ {
+ if (write_protect_on == 0) // write protect off, so install memory normally
+ {
+ space->install_ram(expansion_ram_start, expansion_ram_end, expram);
+ if (shadow_ram_end > expansion_ram_end)
+ space->install_ram(expansion_ram_end + 1, shadow_ram_end, expram);
+ }
+ else // write protect on, so make memory read only
+ {
+ space->nop_write(expansion_ram_start, expansion_ram_end);
+ }
+ }
+}
+
+void get_ram_expansion_settings(address_space *space, int &ram_expansion_installed, int &write_protect_on, int &expansion_ram_start, int &expansion_ram_end, int &shadow_ram_end)
+{
+ if (space->machine().root_device().ioport("PROTECT")->read() == 0x01)
+ write_protect_on = 1;
+ else
+ write_protect_on = 0;
+
+ ram_expansion_installed = 1;
+
+ switch(space->machine().root_device().ioport("CFG")->read()) // check RAM expansion configuration and set address ranges
+ {
+ case 0x00: // No RAM Expansion
+ ram_expansion_installed = 0;
+ break;
+ case 0x01: // 16KB Viper System 1 RAM Expansion
+ expansion_ram_start = 0x6000;
+ expansion_ram_end = 0x9fff;
+ shadow_ram_end = 0;
+ break;
+ case 0x02: // "32KB Lil' WHITE RAM Expansion
+ expansion_ram_start = 0x5000;
+ expansion_ram_end = 0xcfff;
+ shadow_ram_end = 0xffff;
+ break;
+ case 0x04: // R&L 64K RAM Board (44KB installed)
+ expansion_ram_start = 0x5000;
+ expansion_ram_end = 0xffff;
+ shadow_ram_end = 0;
+ break;
+ case 0x08: // 4KB Blue RAM Expansion
+ expansion_ram_start = 0x6000;
+ expansion_ram_end = 0x6fff;
+ shadow_ram_end = 0;
+ break;
+ case 0x10: // 16KB Blue RAM Expansion
+ expansion_ram_start = 0x6000;
+ expansion_ram_end = 0x9fff;
+ shadow_ram_end = 0;
+ break;
+ case 0x20: // 32KB Blue RAM Expansion
+ expansion_ram_start = 0x6000;
+ expansion_ram_end = 0xdfff;
+ shadow_ram_end = 0;
+ break;
+ default:
+ break;
+ }
+}
+
+
+/*************************************
+ *
+ * Driver definitions
+ *
+ *************************************/
+
+/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS */
+CONS( 1978, astrocde, 0, 0, astrocde, astrocde, astrocde_state, astrocde, "Bally Manufacturing", "Bally Professional Arcade", GAME_SUPPORTS_SAVE )
+CONS( 1977, astrocdl, astrocde, 0, astrocde, astrocde, astrocde_state, astrocde, "Bally Manufacturing", "Bally Home Library Computer", GAME_SUPPORTS_SAVE )
+CONS( 1977, astrocdw, astrocde, 0, astrocde, astrocde, astrocde_state, astrocde, "Bally Manufacturing", "Bally Computer System", GAME_SUPPORTS_SAVE )