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-rw-r--r--src/mess/drivers/astrocde.c190
1 files changed, 23 insertions, 167 deletions
diff --git a/src/mess/drivers/astrocde.c b/src/mess/drivers/astrocde.c
index 9912514a583..5058efc65c1 100644
--- a/src/mess/drivers/astrocde.c
+++ b/src/mess/drivers/astrocde.c
@@ -14,23 +14,24 @@
#include "sound/astrocde.h"
#include "bus/astrocde/slot.h"
#include "bus/astrocde/rom.h"
+#include "bus/astrocde/exp.h"
+#include "bus/astrocde/ram.h"
class astrocde_mess_state : public astrocde_state
{
public:
astrocde_mess_state(const machine_config &mconfig, device_type type, const char *tag)
: astrocde_state(mconfig, type, tag),
- m_cart(*this, "cartslot")
+ m_cart(*this, "cartslot"),
+ m_exp(*this, "exp")
{ }
required_device<astrocade_cart_slot_device> m_cart;
- void get_ram_expansion_settings(int &ram_expansion_installed, int &write_protect_on, int &expansion_ram_start, int &expansion_ram_end, int &shadow_ram_end);
+ required_device<astrocade_exp_device> m_exp;
DECLARE_MACHINE_START(astrocde);
- DECLARE_MACHINE_RESET(astrocde);
- DECLARE_INPUT_CHANGED_MEMBER(set_write_protect);
};
-/*************************************
+/*********************************************************************************
*
* Memory maps
*
@@ -42,58 +43,13 @@ public:
* 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_mess_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 */
+ //AM_RANGE(0x5000, 0xffff) AM_DEVREADWRITE("exp", astrocade_exp_device, read, write)
ADDRESS_MAP_END
@@ -101,29 +57,6 @@ static ADDRESS_MAP_START( astrocade_io, AS_IO, 8, astrocde_mess_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
-INPUT_CHANGED_MEMBER(astrocde_mess_state::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 = m_maincpu->space(AS_PROGRAM);
- UINT8 *expram = machine().device<ram_device>("ram_tag")->pointer();
-
- get_ram_expansion_settings(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
@@ -227,21 +160,6 @@ static INPUT_PORTS_START( astrocde )
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_MEMBER(DEVICE_SELF, astrocde_mess_state, set_write_protect, 0)
- PORT_DIPSETTING( 0x00, "Write Protect Off")
- PORT_DIPSETTING( 0x01, "Write Protect On")
INPUT_PORTS_END
@@ -257,6 +175,15 @@ static SLOT_INTERFACE_START(astrocade_cart)
SLOT_INTERFACE_INTERNAL("rom_512k", ASTROCADE_ROM_512K)
SLOT_INTERFACE_END
+static SLOT_INTERFACE_START(astrocade_exp)
+ SLOT_INTERFACE("blue_ram_4k", ASTROCADE_BLUERAM_4K)
+ SLOT_INTERFACE("blue_ram_16k", ASTROCADE_BLUERAM_16K)
+ SLOT_INTERFACE("blue_ram_32k", ASTROCADE_BLUERAM_32K)
+ SLOT_INTERFACE("viper_sys1", ASTROCADE_VIPER_SYS1)
+ SLOT_INTERFACE("lil_white_ram", ASTROCADE_WHITERAM)
+ SLOT_INTERFACE("rl64_ram", ASTROCADE_RL64RAM)
+SLOT_INTERFACE_END
+
static MACHINE_CONFIG_START( astrocde, astrocde_mess_state )
/* basic machine hardware */
@@ -265,7 +192,6 @@ static MACHINE_CONFIG_START( astrocde, astrocde_mess_state )
MCFG_CPU_IO_MAP(astrocade_io)
MCFG_MACHINE_START_OVERRIDE(astrocde_mess_state, astrocde)
- MCFG_MACHINE_RESET_OVERRIDE(astrocde_mess_state, astrocde)
/* video hardware */
MCFG_SCREEN_ADD("screen", RASTER)
@@ -281,9 +207,8 @@ static MACHINE_CONFIG_START( astrocde, astrocde_mess_state )
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")
+ /* expansion port */
+ MCFG_ASTROCADE_EXPANSION_SLOT_ADD("exp", astrocade_exp, NULL)
/* cartridge */
MCFG_ASTROCADE_CARTRIDGE_ADD("cartslot", astrocade_cart, NULL)
@@ -329,82 +254,13 @@ MACHINE_START_MEMBER(astrocde_mess_state, astrocde)
{
if (m_cart->exists())
m_maincpu->space(AS_PROGRAM).install_read_handler(0x2000, 0x3fff, read8_delegate(FUNC(astrocade_cart_slot_device::read_rom),(astrocade_cart_slot_device*)m_cart));
-}
-MACHINE_RESET_MEMBER(astrocde_mess_state, 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 = m_maincpu->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(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);
- }
- }
+ // if no RAM is mounted and the handlers are installed, the system starts with garbage on screen and a RESET is necessary
+ // thus, install RAM only if an expansion is mounted
+ if (m_exp->get_card_mounted())
+ m_maincpu->space(AS_PROGRAM).install_readwrite_handler(0x5000, 0xffff, read8_delegate(FUNC(astrocade_exp_device::read),(astrocade_exp_device*)m_exp), write8_delegate(FUNC(astrocade_exp_device::write),(astrocade_exp_device*)m_exp));
}
-void astrocde_mess_state::get_ram_expansion_settings(int &ram_expansion_installed, int &write_protect_on, int &expansion_ram_start, int &expansion_ram_end, int &shadow_ram_end)
-{
- if (ioport("PROTECT")->read() == 0x01)
- write_protect_on = 1;
- else
- write_protect_on = 0;
-
- ram_expansion_installed = 1;
-
- switch(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