/
spec128.cpp
429 lines (352 loc) · 17.3 KB
/
spec128.cpp
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// license:GPL-2.0+
// copyright-holders:Kevin Thacker
/***************************************************************************
NOTE: ****** Specbusy: press N, R, or E to boot *************
Spectrum/Inves/TK90X etc. memory map:
CPU:
0000-3fff ROM
4000-ffff RAM
Spectrum 128/+2/+2a/+3 memory map:
CPU:
0000-3fff Banked ROM/RAM (banked rom only on 128/+2)
4000-7fff Banked RAM
8000-bfff Banked RAM
c000-ffff Banked RAM
TS2068 memory map: (Can't have both EXROM and DOCK active)
The 8K EXROM can be loaded into multiple pages.
CPU:
0000-1fff ROM / EXROM / DOCK (Cartridge)
2000-3fff ROM / EXROM / DOCK
4000-5fff \
6000-7fff \
8000-9fff |- RAM / EXROM / DOCK
a000-bfff |
c000-dfff /
e000-ffff /
Interrupts:
Changes:
29/1/2000 KT - Implemented initial +3 emulation.
30/1/2000 KT - Improved input port decoding for reading and therefore
correct keyboard handling for Spectrum and +3.
31/1/2000 KT - Implemented buzzer sound for Spectrum and +3.
Implementation copied from Paul Daniel's Jupiter driver.
Fixed screen display problems with dirty chars.
Added support to load .Z80 snapshots. 48k support so far.
13/2/2000 KT - Added Interface II, Kempston, Fuller and Mikrogen
joystick support.
17/2/2000 DJR - Added full key descriptions and Spectrum+ keys.
Fixed Spectrum +3 keyboard problems.
17/2/2000 KT - Added tape loading from WAV/Changed from DAC to generic
speaker code.
18/2/2000 KT - Added tape saving to WAV.
27/2/2000 KT - Took DJR's changes and added my changes.
27/2/2000 KT - Added disk image support to Spectrum +3 driver.
27/2/2000 KT - Added joystick I/O code to the Spectrum +3 I/O handler.
14/3/2000 DJR - Tape handling dipswitch.
26/3/2000 DJR - Snapshot files are now classified as snapshots not
cartridges.
04/4/2000 DJR - Spectrum 128 / +2 Support.
13/4/2000 DJR - +4 Support (unofficial 48K hack).
13/4/2000 DJR - +2a Support (rom also used in +3 models).
13/4/2000 DJR - TK90X, TK95 and Inves support (48K clones).
21/4/2000 DJR - TS2068 and TC2048 support (TC2048 Supports extra video
modes but doesn't have bank switching or sound chip).
09/5/2000 DJR - Spectrum +2 (France, Spain), +3 (Spain).
17/5/2000 DJR - Dipswitch to enable/disable disk drives on +3 and clones.
27/6/2000 DJR - Changed 128K/+3 port decoding (sound now works in Zub 128K).
06/8/2000 DJR - Fixed +3 Floppy support
10/2/2001 KT - Re-arranged code and split into each model emulated.
Code is split into 48k, 128k, +3, tc2048 and ts2048
segments. 128k uses some of the functions in 48k, +3
uses some functions in 128, and tc2048/ts2048 use some
of the functions in 48k. The code has been arranged so
these functions come in some kind of "override" order,
read functions changed to use READ8_HANDLER and write
functions changed to use WRITE8_HANDLER.
Added Scorpion256 preliminary.
18/6/2001 DJR - Added support for Interface 2 cartridges.
xx/xx/2001 KS - TS-2068 sound fixed.
Added support for DOCK cartridges for TS-2068.
Added Spectrum 48k Psycho modified rom driver.
Added UK-2086 driver.
23/12/2001 KS - 48k machines are now able to run code in screen memory.
Programs which keep their code in screen memory
like monitors, tape copiers, decrunchers, etc.
works now.
Fixed problem with interrupt vector set to 0xffff (much
more 128k games works now).
A useful used trick on the Spectrum is to set
interrupt vector to 0xffff (using the table
which contain 0xff's) and put a byte 0x18 hex,
the opcode for JR, at this address. The first
byte of the ROM is a 0xf3 (DI), so the JR will
jump to 0xfff4, where a long JP to the actual
interrupt routine is put. Due to unideal
bankswitching in MAME this JP were to 0001 what
causes Spectrum to reset. Fixing this problem
made much more software running (i.e. Paperboy).
Corrected frames per second value for 48k and 128k
Sinclair machines.
There are 50.08 frames per second for Spectrum
48k what gives 69888 cycles for each frame and
50.021 for Spectrum 128/+2/+2A/+3 what gives
70908 cycles for each frame.
Remapped some Spectrum+ keys.
Pressing F3 to reset was setting 0xf7 on keyboard
input port. Problem occurred for snapshots of
some programs where it was read as pressing
key 4 (which is exit in Tapecopy by R. Dannhoefer
for example).
Added support to load .SP snapshots.
Added .BLK tape images support.
.BLK files are identical to .TAP ones, extension
is an only difference.
08/03/2002 KS - #FF port emulation added.
Arkanoid works now, but is not playable due to
completely messed timings.
Initialisation values used when determining which model is being emulated:
48K Spectrum doesn't use either port.
128K/+2 Bank switches with port 7ffd only.
+3/+2a Bank switches with both ports.
Notes:
1. No contented memory.
2. No hi-res colour effects (need contended memory first for accurate timing).
3. Multiface 1 and Interface 1 not supported.
4. Horace and the Spiders cartridge doesn't run properly.
5. Tape images not supported:
.TZX, .SPC, .ITM, .PAN, .TAP(Warajevo), .VOC, .ZXS.
6. Snapshot images not supported:
.ACH, .PRG, .RAW, .SEM, .SIT, .SNX, .ZX, .ZXS, .ZX82.
7. 128K emulation is not perfect - the 128K machines crash and hang while
running quite a lot of games.
8. Disk errors occur on some +3 games.
9. Video hardware of all machines is timed incorrectly.
10. EXROM and HOME cartridges are not emulated.
11. The TK90X and TK95 roms output 0 to port #df on start up.
12. The purpose of this port is unknown (probably display mode as TS2068) and
thus is not emulated.
Very detailed infos about the ZX Spectrum +3e can be found at
http://www.z88forever.org.uk/zxplus3e/
The hc2000 corrupts its memory, especially if you type something, and the
resulting mess can be seen in the F4 viewer display.
*******************************************************************************/
#include "emu.h"
#include "spec128.h"
#include "cpu/z80/z80.h"
#include "sound/ay8910.h"
#include "screen.h"
#include "formats/tzx_cas.h"
/****************************************************************************************************/
/* Spectrum 128 specific functions */
void spectrum_128_state::video_start()
{
spectrum_state::video_start();
m_screen_location = m_ram->pointer() + (5 << 14);
m_border4t_render_at = 5;
}
uint8_t spectrum_128_state::spectrum_128_pre_opcode_fetch_r(offs_t offset)
{
if (is_contended(offset)) content_early();
/* this allows expansion devices to act upon opcode fetches from MEM addresses
for example, interface1 detection fetches requires fetches at 0008 / 0708 to
enable paged ROM and then fetches at 0700 to disable it
*/
m_exp->pre_opcode_fetch(offset);
uint8_t retval = m_maincpu->space(AS_PROGRAM).read_byte(offset);
m_exp->post_opcode_fetch(offset);
return retval;
}
void spectrum_128_state::spectrum_128_rom_w(offs_t offset, uint8_t data)
{
m_exp->mreq_w(offset, data);
}
u8 spectrum_128_state::spectrum_128_rom_r(offs_t offset)
{
return m_exp->romcs()
? m_exp->mreq_r(offset)
: ((u8*)m_bank_rom[0]->base())[offset];
}
template <u8 Bank> void spectrum_128_state::spectrum_128_ram_w(offs_t offset, u8 data)
{
u16 addr = 0x4000 * Bank + offset;
if (is_contended(addr)) content_early();
if (is_vram_write(addr)) m_screen->update_now();
((u8*)m_bank_ram[Bank]->base())[offset] = data;
}
// Base 128 models typically don't share RAM in bank0. Reserved for extension in 256+.
template void spectrum_128_state::spectrum_128_ram_w<0>(offs_t offset, u8 data);
template <u8 Bank> u8 spectrum_128_state::spectrum_128_ram_r(offs_t offset)
{
u16 addr = 0x4000 * Bank + offset;
if (is_contended(addr)) content_early();
return ((u8*)m_bank_ram[Bank]->base())[offset];
}
void spectrum_128_state::spectrum_128_port_7ffd_w(offs_t offset, uint8_t data)
{
if (is_contended(offset)) content_early();
content_early(1);
/* D0-D2: RAM page located at 0x0c000-0x0ffff */
/* D3 - Screen select (screen 0 in ram page 5, screen 1 in ram page 7 */
/* D4 - ROM select - which rom paged into 0x0000-0x03fff */
/* D5 - Disable paging */
/* disable paging? */
if (m_port_7ffd_data & 0x20) return;
/* store new state */
m_port_7ffd_data = data;
/* update memory */
spectrum_128_update_memory();
m_exp->iorq_w(offset | 1, data);
}
void spectrum_128_state::spectrum_128_update_memory()
{
m_bank_rom[0]->set_entry(BIT(m_port_7ffd_data, 4));
/* select ram at 0x0c000-0x0ffff */
m_bank_ram[3]->set_entry(m_port_7ffd_data & 0x07);
m_screen->update_now();
if (BIT(m_port_7ffd_data, 3))
m_screen_location = m_ram->pointer() + (7<<14);
else
m_screen_location = m_ram->pointer() + (5<<14);
}
uint8_t spectrum_128_state::spectrum_port_r(offs_t offset)
{
if (is_contended(offset))
{
content_early();
content_late();
}
// Pass through to expansion device if present
if (m_exp->get_card_device())
return m_exp->iorq_r(offset | 1);
return floating_bus_r();
}
void spectrum_128_state::spectrum_128_io(address_map &map)
{
map(0x0000, 0x0000).select(0xfffe).rw(FUNC(spectrum_128_state::spectrum_ula_r), FUNC(spectrum_128_state::spectrum_ula_w));
map(0x0001, 0x0001).select(0xfffe).rw(FUNC(spectrum_128_state::spectrum_port_r), FUNC(spectrum_128_state::spectrum_port_w));
map(0x0001, 0x0001).select(0x7ffc).w(FUNC(spectrum_128_state::spectrum_128_port_7ffd_w)); // (A15 | A1) == 0, note: reading from this port does write to it by value from data bus
map(0x8000, 0x8000).mirror(0x3ffd).w("ay8912", FUNC(ay8910_device::data_w));
map(0xc000, 0xc000).mirror(0x3ffd).rw("ay8912", FUNC(ay8910_device::data_r), FUNC(ay8910_device::address_w));
}
void spectrum_128_state::spectrum_128_mem(address_map &map)
{
map(0x0000, 0x3fff).rw(FUNC(spectrum_128_state::spectrum_128_rom_r), FUNC(spectrum_128_state::spectrum_128_rom_w));
map(0x4000, 0x7fff).rw(FUNC(spectrum_128_state::spectrum_128_ram_r<1>), FUNC(spectrum_128_state::spectrum_128_ram_w<1>));
map(0x8000, 0xbfff).rw(FUNC(spectrum_128_state::spectrum_128_ram_r<2>), FUNC(spectrum_128_state::spectrum_128_ram_w<2>));
map(0xc000, 0xffff).rw(FUNC(spectrum_128_state::spectrum_128_ram_r<3>), FUNC(spectrum_128_state::spectrum_128_ram_w<3>));
}
void spectrum_128_state::spectrum_128_fetch(address_map &map)
{
map(0x0000, 0xffff).r(FUNC(spectrum_128_state::spectrum_128_pre_opcode_fetch_r));
}
void spectrum_128_state::machine_start()
{
spectrum_state::machine_start();
save_item(NAME(m_port_7ffd_data));
/* rom 0 is 128K rom, rom 1 is 48 BASIC */
memory_region *rom = memregion("maincpu");
m_bank_rom[0]->configure_entries(0, 2, rom->base() + 0x10000, 0x4000);
auto ram_entries = m_ram->size() / 0x4000;
for (auto i = 1; i < 4; i++)
m_bank_ram[i]->configure_entries(0, ram_entries, m_ram->pointer(), 0x4000);
m_bank_ram[1]->set_entry(ram_entries > 5 ? 5 : (ram_entries - 1)); /* Bank 5 is always in 0x4000 - 0x7fff */
m_bank_ram[2]->set_entry(2); /* Bank 2 is always in 0x8000 - 0xbfff */
}
void spectrum_128_state::machine_reset()
{
spectrum_state::machine_reset();
/* set initial ram config */
m_port_7ffd_data = 0;
spectrum_128_update_memory();
}
bool spectrum_128_state::is_vram_write(offs_t offset) {
return (BIT(m_port_7ffd_data, 3) && m_bank_ram[3]->entry() == 7)
? offset >= 0xc000 && offset < 0xdb00
: spectrum_state::is_vram_write(offset);
}
bool spectrum_128_state::is_contended(offs_t offset) {
u8 bank = m_bank_ram[3]->entry();
return spectrum_state::is_contended(offset)
|| ((offset >= 0xc000 && offset <= 0xffff) && (bank & 1)); // Memory banks 1,3,5 and 7 are contended
}
static const gfx_layout spectrum_charlayout =
{
8, 8, /* 8 x 8 characters */
96, /* 96 characters */
1, /* 1 bits per pixel */
{ 0 }, /* no bitplanes */
{STEP8(0, 1)}, /* x offsets */
{STEP8(0, 8)}, /* y offsets */
8*8 /* every char takes 8 bytes */
};
static GFXDECODE_START( spec128 )
GFXDECODE_ENTRY( "maincpu", 0x17d00, spectrum_charlayout, 7, 8 )
GFXDECODE_END
rectangle spectrum_128_state::get_screen_area()
{
return { SPEC_LEFT_BORDER, SPEC_LEFT_BORDER + SPEC_DISPLAY_XSIZE - 1,
SPEC128_UNSEEN_LINES + SPEC_TOP_BORDER, SPEC128_UNSEEN_LINES + SPEC_TOP_BORDER + SPEC_DISPLAY_YSIZE - 1 };
}
void spectrum_128_state::spectrum_128(machine_config &config)
{
spectrum(config);
Z80(config.replace(), m_maincpu, X1_128_SINCLAIR / 10);
m_maincpu->set_addrmap(AS_PROGRAM, &spectrum_128_state::spectrum_128_mem);
m_maincpu->set_addrmap(AS_IO, &spectrum_128_state::spectrum_128_io);
m_maincpu->set_addrmap(AS_OPCODES, &spectrum_128_state::spectrum_128_fetch);
m_maincpu->set_vblank_int("screen", FUNC(spectrum_128_state::spec_interrupt));
m_maincpu->nomreq_cb().set(FUNC(spectrum_128_state::spectrum_nomreq));
config.set_maximum_quantum(attotime::from_hz(60));
/* video hardware */
rectangle visarea = { get_screen_area().left() - SPEC_LEFT_BORDER, get_screen_area().right() + SPEC_RIGHT_BORDER,
get_screen_area().top() - SPEC_TOP_BORDER, get_screen_area().bottom() + SPEC_BOTTOM_BORDER };
m_screen->set_raw(X1_128_SINCLAIR / 5, SPEC128_CYCLES_PER_LINE * 2, SPEC128_UNSEEN_LINES + SPEC_SCREEN_HEIGHT, visarea);
subdevice<gfxdecode_device>("gfxdecode")->set_info(spec128);
/* sound hardware */
AY8912(config, "ay8912", X1_128_SINCLAIR / 20).add_route(ALL_OUTPUTS, "mono", 0.25);
/* expansion port */
SPECTRUM_EXPANSION_SLOT(config.replace(), m_exp, spec128_expansion_devices, nullptr);
m_exp->irq_handler().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
m_exp->nmi_handler().set_inputline(m_maincpu, INPUT_LINE_NMI);
m_exp->fb_r_handler().set(FUNC(spectrum_128_state::floating_bus_r));
/* internal ram */
m_ram->set_default_size("128K");
}
/***************************************************************************
Game driver(s)
***************************************************************************/
ROM_START(spec128)
ROM_REGION(0x18000,"maincpu",0)
ROM_SYSTEM_BIOS( 0, "en", "English" )
ROMX_LOAD("zx128_0.rom",0x10000,0x4000, CRC(e76799d2) SHA1(4f4b11ec22326280bdb96e3baf9db4b4cb1d02c5), ROM_BIOS(0))
ROMX_LOAD("zx128_1.rom",0x14000,0x4000, CRC(b96a36be) SHA1(80080644289ed93d71a1103992a154cc9802b2fa), ROM_BIOS(0))
ROM_SYSTEM_BIOS( 1, "sp", "Spanish" )
ROMX_LOAD("zx128s0.rom",0x10000,0x4000, CRC(453d86b2) SHA1(968937b1c750f0ef6205f01c6db4148da4cca4e3), ROM_BIOS(1))
ROMX_LOAD("zx128s1.rom",0x14000,0x4000, CRC(6010e796) SHA1(bea3f397cc705eafee995ea629f4a82550562f90), ROM_BIOS(1))
ROM_END
ROM_START(specpls2)
ROM_REGION(0x18000,"maincpu",0)
ROM_SYSTEM_BIOS( 0, "en", "English" )
ROMX_LOAD("zxp2_0.rom",0x10000,0x4000, CRC(5d2e8c66) SHA1(72703f9a3e734f3c23ec34c0727aae4ccbef9a91), ROM_BIOS(0))
ROMX_LOAD("zxp2_1.rom",0x14000,0x4000, CRC(98b1320b) SHA1(de8b0d2d0379cfe7c39322a086ca6da68c7f23cb), ROM_BIOS(0))
ROM_SYSTEM_BIOS( 1, "fr", "French" )
ROMX_LOAD("plus2fr0.rom",0x10000,0x4000, CRC(c684c535) SHA1(56684c4c85a616e726a50707483b9a42d8e724ed), ROM_BIOS(1))
ROMX_LOAD("plus2fr1.rom",0x14000,0x4000, CRC(f5e509c5) SHA1(7e398f62689c9d90a36d3a101351ec9987207308), ROM_BIOS(1))
ROM_SYSTEM_BIOS( 2, "sp", "Spanish" )
ROMX_LOAD("plus2sp0.rom",0x10000,0x4000, CRC(e807d06e) SHA1(8259241b28ff85441f1bedc2bee53445767c51c5), ROM_BIOS(2))
ROMX_LOAD("plus2sp1.rom",0x14000,0x4000, CRC(41981d4b) SHA1(ec0d5a158842d20601b4fbeaefc6668db979d0e1), ROM_BIOS(2))
ROM_SYSTEM_BIOS( 3, "ao", "ZX Spectrum +2c (Andrew Owen)" )
ROMX_LOAD("plus2c-0.rom",0x10000,0x4000, CRC(bfddf748) SHA1(3eba870bcb2c5efa906f2ca3febe960fc35d66bb), ROM_BIOS(3))
ROMX_LOAD("plus2c-1.rom",0x14000,0x4000, CRC(fd8552b6) SHA1(5ffcf79f2154ba2cf42cc1d9cb4be93cb5043e73), ROM_BIOS(3))
ROM_SYSTEM_BIOS( 4, "namco", "ZX Spectrum +2c (Namco)" )
ROMX_LOAD("pl2namco.rom",0x10000,0x8000, CRC(72a54e75) SHA1(311400157df689450dadc3620f4c4afa960b05ad), ROM_BIOS(4))
ROM_END
ROM_START(hc128) // Romanian clone, "ICE Felix HC91+" (aka HC-128), AY-8910 was optional
ROM_REGION(0x18000,"maincpu",0)
ROM_LOAD("zx128_0.rom",0x10000,0x4000, CRC(e76799d2) SHA1(4f4b11ec22326280bdb96e3baf9db4b4cb1d02c5))
ROM_LOAD("hc128.rom", 0x14000,0x4000, CRC(0241e960) SHA1(cea0d14391b9e571460a816088a1c00ecb24afa3))
ROM_END
// YEAR NAME PARENT COMPAT MACHINE INPUT STATE INIT COMPANY FULLNAME FLAGS
COMP( 1986, spec128, 0, 0, spectrum_128, spec128, spectrum_128_state, empty_init, "Sinclair Research Ltd", "ZX Spectrum 128", 0 )
COMP( 1986, specpls2, spec128, 0, spectrum_128, spec_plus, spectrum_128_state, empty_init, "Amstrad plc", "ZX Spectrum +2", 0 )
COMP( 1991, hc128, spec128, 0, spectrum_128, spec_plus, spectrum_128_state, empty_init, "ICE-Felix", "HC-91+ (HC-128)", 0 )