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authorGravatarGravatar Frank Palazzolo <frank@avoidspikes.com>2020-11-21 15:36:25 -0500
committerGravatarGravatar Frank Palazzolo <frank@avoidspikes.com>2020-11-21 15:36:25 -0500
commitaf1c5e7bcb291161b34e8d376031519ecc4e8f34 (patch)
tree520116466aeb6f10427e569aa834712b4261e8ce /src/mame
parent5ffbb7f4759a823c155bfc1aa0f5a561b7eed3e2 (diff)
bit90: Update to support BASIC 3.1 mask roms. Also added RAM options
Diffstat (limited to 'src/mame')
-rw-r--r--src/mame/drivers/coleco.cpp50
-rw-r--r--src/mame/includes/coleco.h7
2 files changed, 39 insertions, 18 deletions
diff --git a/src/mame/drivers/coleco.cpp b/src/mame/drivers/coleco.cpp
index 015899fbd5a..20c6b063f43 100644
--- a/src/mame/drivers/coleco.cpp
+++ b/src/mame/drivers/coleco.cpp
@@ -62,9 +62,9 @@
- Dina SG-1000 mode
- Bit90:
- Add support for memory expansion (documented)
+ Add support for external memory handling (documented)
Add support for printer interface (documented)
- Add tape Support
+ Add tape support
*/
@@ -97,6 +97,18 @@ void coleco_state::paddle_on_w(uint8_t data)
m_joy_mode = 1;
}
+void bit90_state::init()
+{
+ auto pgm = &m_maincpu->space(AS_PROGRAM);
+
+ if(m_ram->size() == 32768)
+ return;
+ else if(m_ram->size() == 16384)
+ pgm->unmap_readwrite(0xc000, 0xffff);
+ else if(m_ram->size() == 1024)
+ pgm->unmap_readwrite(0x8000, 0xffff);
+}
+
uint8_t bit90_state::bankswitch_u4_r(address_space &space)
{
if (!machine().side_effects_disabled()) {
@@ -141,7 +153,7 @@ void bit90_state::u32_w(uint8_t data)
void coleco_state::coleco_map(address_map &map)
{
map(0x0000, 0x1fff).rom();
- map(0x6000, 0x63ff).ram().mirror(0x1c00).share("ram");
+ map(0x6000, 0x63ff).ram().mirror(0x1c00);
map(0x8000, 0xffff).rom();
}
@@ -150,8 +162,8 @@ void bit90_state::bit90_map(address_map &map)
map(0x0000, 0x1fff).bankr("bank");
map(0x2000, 0x3fff).rom();
map(0x4000, 0x5fff).rom(); // Decoded through pin 5 of the Bit90 expansion port
- map(0x6000, 0x67ff).ram().mirror(0x1800).share("ram");
- map(0x8000, 0xffff).rom(); // More RAM could also appear here (TBD)
+ map(0x6000, 0x67ff).ram().mirror(0x1800);
+ map(0x8000, 0xffff).ram();
}
void coleco_state::coleco_io_map(address_map &map)
@@ -189,13 +201,13 @@ void bit90_state::bit90_io_map(address_map &map)
// External/(Internal?) RAM Interface
//map(0x4e, 0x4f).w(FUNC(bit90_state::external_ram_control_w)); // 0x4e enable, 0x4f disable
- // RAM can appear, starting at 0x8000 up to 0xffff
+ // RAM can appear here, starting at 0x8000 up to 0xffff
}
void coleco_state::czz50_map(address_map &map)
{
map(0x0000, 0x3fff).rom();
- map(0x6000, 0x63ff).ram().mirror(0x1c00).share("ram");
+ map(0x6000, 0x63ff).ram().mirror(0x1c00);
map(0x8000, 0xffff).rom();
}
@@ -490,8 +502,6 @@ uint8_t coleco_state::coleco_paddle_read(int port, int joy_mode, uint8_t joy_sta
void coleco_state::machine_start()
{
- memset(m_ram, 0xff, m_ram.bytes()); // initialize RAM
-
// init paddles
for (int port = 0; port < 2; port++)
{
@@ -617,6 +627,9 @@ void bit90_state::bit90(machine_config &config)
/* software lists */
SOFTWARE_LIST(config, "cart_list").set_original("coleco");
+ /* internal ram */
+ RAM(config, m_ram).set_default_size("32K").set_extra_options("1K,16K");
+
TIMER(config, "paddle_timer").configure_periodic(FUNC(coleco_state::paddle_update_callback), attotime::from_msec(20));
}
@@ -691,9 +704,14 @@ ROM_END
#define rom_dina rom_czz50
#define rom_prsarcde rom_czz50
-/* BIT90 BIOS
+/* Bit Corporation - BIT90
+
+Circuit board is labelled: BIT90C-PAL-90002 or BIT90C-PAL-90003
+
+BIT90C-PAL-90002 has 2K Internal RAM (<1K Usable from BASIC)
+ Extra RAM can only be accessed via expansion port
-Circuit board is labelled: BIT90C-PAL-90002
+BIT90C-PAL-90003 has sockets for additional internal 16K or 32K internal RAM
Units have 2764-compatible pinouts at U2,U3, and U4
Some units have 2764 EPROMS, Mask ROMs, or a combination
@@ -715,19 +733,19 @@ MONITOR3
*/
ROM_START( bit90 )
- ROM_DEFAULT_BIOS( "3.0" )
+ ROM_DEFAULT_BIOS( "3.1" )
ROM_SYSTEM_BIOS( 0, "3.0", "BASIC 3.0" )
ROM_SYSTEM_BIOS( 1, "3.1", "BASIC 3.1" )
ROM_REGION( 0x10000, "maincpu", 0 )
ROMX_LOAD("bit90b3.u2", 0x2000, 0x2000, CRC(b992b940) SHA1(c7dd96a1944fac40cbae20630f303a69de7e6313), ROM_BIOS(0))
- ROMX_LOAD("d32522e.u2", 0x2000, 0x2000, NO_DUMP, ROM_BIOS(1)) // MONITOR3
+ ROMX_LOAD("d32522e.u2", 0x2000, 0x2000, CRC(66fc66b0) SHA1(6644c217860aa9940bef7c6aeb50768810d9035b), ROM_BIOS(1)) // MONITOR3
ROM_REGION( 0x4000, "banked", 0 )
ROMX_LOAD("bit90b3.u4", 0x0000, 0x2000, CRC(06d21fc2) SHA1(6d296b09b661babd4c2ef6993f8e768a67932388), ROM_BIOS(0))
ROMX_LOAD("bit90b3.u3", 0x2000, 0x2000, CRC(61fdccbb) SHA1(25cac13627c0916d3ed2b92f0b2218b405de5be4), ROM_BIOS(0))
- ROMX_LOAD("d32351e.u4", 0x0000, 0x2000, NO_DUMP, ROM_BIOS(1)) // BIT-99C1
- ROMX_LOAD("d32521e.u3", 0x2000, 0x2000, NO_DUMP, ROM_BIOS(1)) // MONITOR2
+ ROMX_LOAD("d32351e.u4", 0x0000, 0x2000, CRC(d00c7137) SHA1(43328257136aff5a4984cceafdb5601200ac24b4), ROM_BIOS(1)) // BIT-99C1
+ ROMX_LOAD("d32521e.u3", 0x2000, 0x2000, CRC(f6401dd8) SHA1(78bc7f0fe4f5eb114773d654c92598512481abec), ROM_BIOS(1)) // MONITOR2
ROM_END
/* System Drivers */
@@ -739,4 +757,4 @@ CONS( 1983, colecop, coleco, 0, colecop, coleco, coleco_state, empty_init
CONS( 1986, czz50, 0, coleco, czz50, czz50, coleco_state, empty_init, "Bit Corporation", "Chuang Zao Zhe 50", 0 )
CONS( 1988, dina, czz50, 0, dina, czz50, coleco_state, empty_init, "Telegames", "Dina", 0 )
CONS( 1988, prsarcde, czz50, 0, czz50, czz50, coleco_state, empty_init, "Telegames", "Personal Arcade", 0 )
-COMP( 1983, bit90, 0, coleco, bit90, bit90, bit90_state, empty_init, "Bit Corporation", "Bit90", 0 )
+COMP( 1983, bit90, 0, coleco, bit90, bit90, bit90_state, init, "Bit Corporation", "Bit90", 0 )
diff --git a/src/mame/includes/coleco.h b/src/mame/includes/coleco.h
index 01c3bb55e56..ce0be553be2 100644
--- a/src/mame/includes/coleco.h
+++ b/src/mame/includes/coleco.h
@@ -8,6 +8,7 @@
#include "cpu/z80/z80.h"
#include "machine/timer.h"
+#include "machine/ram.h"
#include "sound/sn76496.h"
#include "video/tms9928a.h"
#include "machine/coleco.h"
@@ -20,7 +21,6 @@ public:
: driver_device(mconfig, type, tag),
m_maincpu(*this, "maincpu"),
m_cart(*this, COLECOVISION_CARTRIDGE_SLOT_TAG),
- m_ram(*this, "ram"),
m_ctrlsel(*this, "CTRLSEL"),
m_std_keypad1(*this, "STD_KEYPAD1"),
m_std_joy1(*this, "STD_JOY1"),
@@ -69,7 +69,6 @@ public:
protected:
required_device<cpu_device> m_maincpu;
required_device<colecovision_cartridge_slot_device> m_cart;
- required_shared_ptr<uint8_t> m_ram;
int m_joy_mode;
int m_last_nmi_state;
@@ -109,6 +108,7 @@ public:
bit90_state(const machine_config &mconfig, device_type type, const char *tag)
: coleco_state(mconfig, type, tag),
m_bank(*this, "bank"),
+ m_ram(*this, RAM_TAG),
m_io_keyboard(*this, {"ROW0", "ROW1", "ROW2", "ROW3", "ROW4", "ROW5", "ROW6", "ROW7"})
{}
@@ -122,8 +122,11 @@ public:
uint8_t keyboard_r(address_space &space);
void u32_w(uint8_t data);
+ void init();
+
protected:
required_memory_bank m_bank;
+ required_device<ram_device> m_ram;
required_ioport_array<8> m_io_keyboard;
private: