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author Angelo Salese <angelosa@users.noreply.github.com>2023-06-12 01:51:23 +0200
committer GitHub <noreply@github.com>2023-06-12 01:51:23 +0200
commit0855900dedd4ef7a20fd577b23a01d65074deb89 (patch)
tree68999163522a45b23dd1f88859ca999c0d275dfb /src/devices/bus/a800/sic.cpp
parent5ebd8c61f0743bc96407a3fdb58dfe0b78f48b9c (diff)
bus/a800: modernize cart slot interface (#10528)
- use address_maps instead of catch-all handlers; - implement rd4 and rd5 line views; - converted a800_rom_williams_device to the new system, make almost every entry in mega* and prisma* SW to actually boot; - bus/a800: implement maxflash_1mb / maxflash_8mb devices. * This allows loading arbitrary collection of .xex files built thru Maxflash Cartridge Studio program as flash ROM binaries; - bus/a800: implement sic_128kb / sic_256kb / sic_512kb flash ROM devices; - bus/a800: implement ast2k, atrax, Blizzard 32kb, Adawliah, SpartaDOS 128KB, A5200 Super Cart variants; - bus/a800: implement Super Charger math unit device; - a800_slot.cpp: fix xegs cart default slot for loose cart loading; - a800_carts.h: merge a800_turbo64 and a800_turbo128 into single a800_turbo slot option; - bus/a800/a800_slot: split a5200 to own interface New working software list additions ----------------------------------- a800.xml: Maxflash Cartridge Studio - Demonstration Workbook [Atarimax Team], SIC! 31-in-1 Demonstration [SIC! Team] a800.xml: Atrax 01, Atrax 02, Atrax 03, Atrax 04, Atrax 05, Atrax 06, Atrax 08, Atrax 09, Atrax 10, Atrax 11, Atrax 12, Atrax 13, Atrax 15 [Atarimania] a800.xml: Prince of Persia (AtariMAX i/f), Prince of Persia (SIC! i/f) [AtariAge] New software list items marked not working ------------------------------------------ a800.xml: Atrax 14, Atrax 16 [Atarimania], Turbo Hit (Blizzard 32kb) [atari.area] a5200.xml: Bosconian 5200 - Star Destroyer (Ultimate Version) [AtariAge]
Diffstat (limited to 'src/devices/bus/a800/sic.cpp')
-rw-r--r--src/devices/bus/a800/sic.cpp114
1 files changed, 114 insertions, 0 deletions
diff --git a/src/devices/bus/a800/sic.cpp b/src/devices/bus/a800/sic.cpp
new file mode 100644
index 00000000000..fa5aaadb802
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+++ b/src/devices/bus/a800/sic.cpp
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+// license: BSD-3-Clause
+// copyright-holders: Angelo Salese
+/**************************************************************************************************
+
+SIC! "Super Inexpensive Cartridge!"
+
+TODO:
+- Unknown flash types used, Altirra just observed a Winbond 29C020;
+- Customizable Jumper/switch handling for pin signals;
+
+**************************************************************************************************/
+
+#include "emu.h"
+#include "sic.h"
+
+// device type definition
+DEFINE_DEVICE_TYPE(A800_SIC_128KB, a800_sic_128kb_device, "a800_siccart_128kb", "Atari 8-bit SIC! 128KB flash ROM cart")
+DEFINE_DEVICE_TYPE(A800_SIC_256KB, a800_sic_256kb_device, "a800_siccart_256kb", "Atari 8-bit SIC! 256KB flash ROM cart")
+DEFINE_DEVICE_TYPE(A800_SIC_512KB, a800_sic_512kb_device, "a800_siccart_512kb", "Atari 8-bit SIC! 512KB flash ROM cart")
+
+a800_sic_128kb_device::a800_sic_128kb_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock)
+ : a800_rom_device(mconfig, type, tag, owner, clock)
+ , m_flash(*this, "flash")
+ , m_bank(0)
+ , m_write_protect(true)
+{
+}
+
+a800_sic_128kb_device::a800_sic_128kb_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+ : a800_sic_128kb_device(mconfig, A800_SIC_128KB, tag, owner, clock)
+{
+}
+
+void a800_sic_128kb_device::device_add_mconfig(machine_config &config)
+{
+ AMD_29F010(config, m_flash);
+}
+
+void a800_sic_128kb_device::device_start()
+{
+ save_item(NAME(m_bank));
+ save_item(NAME(m_write_protect));
+}
+
+void a800_sic_128kb_device::device_reset()
+{
+ // TODO: ugly assignment, and shouldn't happen in device_reset
+ // TODO: assert against intended size for slot
+ memcpy(m_flash->base(), m_rom, get_rom_size());
+ m_bank_mask = (get_rom_size() / 0x4000) - 1;
+
+ // value of 0 for config_bank_w confirmed
+ m_bank = 0;
+ m_write_protect = true;
+}
+
+// SIC! maps rd4 and rd5 linearly
+// so that 0x8000 maps to 0 and 0xa000 to 0x2000
+u8 a800_sic_128kb_device::read(offs_t offset)
+{
+ return m_flash->read((offset & 0x3fff) | (m_bank * 0x4000));
+}
+
+void a800_sic_128kb_device::write(offs_t offset, u8 data)
+{
+ if (!m_write_protect)
+ m_flash->write((offset & 0x3fff) | (m_bank * 0x4000), data);
+}
+
+void a800_sic_128kb_device::cart_map(address_map &map)
+{
+ map(0x0000, 0x3fff).rw(FUNC(a800_sic_128kb_device::read), FUNC(a800_sic_128kb_device::write));
+}
+
+/*
+ * 1--- ---- enable flash write
+ * -1-- ---- RD4 enable
+ * --0- ---- RD5 enable
+ * ---x xxxx ROM bank, where upper bits are unused for 128KB and 256KB versions
+ */
+void a800_sic_128kb_device::config_bank_w(offs_t offset, u8 data)
+{
+ m_bank = (data & m_bank_mask);
+ rd4_w(BIT(data, 5));
+ rd5_w(!(BIT(data, 6)));
+ m_write_protect = !(BIT(data, 7));
+}
+
+void a800_sic_128kb_device::cctl_map(address_map &map)
+{
+ map(0x00, 0x1f).w(FUNC(a800_sic_128kb_device::config_bank_w));
+}
+
+// 256/512KB variants
+
+a800_sic_256kb_device::a800_sic_256kb_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+ : a800_sic_128kb_device(mconfig, A800_SIC_256KB, tag, owner, clock)
+{
+}
+
+void a800_sic_256kb_device::device_add_mconfig(machine_config &config)
+{
+ AMD_29LV200T(config, m_flash);
+}
+
+a800_sic_512kb_device::a800_sic_512kb_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
+ : a800_sic_128kb_device(mconfig, A800_SIC_512KB, tag, owner, clock)
+{
+}
+
+void a800_sic_512kb_device::device_add_mconfig(machine_config &config)
+{
+ AMD_29F040(config, m_flash);
+}