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risc2500: update note

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This commit is contained in:
hap 2021-04-23 18:55:16 +02:00
parent 5f977adf3f
commit cf00ff3a96
3 changed files with 14 additions and 11 deletions
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10
src/mame/drivers/saitek_risc2500.cpp
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@ -33,7 +33,11 @@ Undocumented buttons:
TODO: TODO:
- bootrom disable timer shouldn't be needed, real ARM has already fetched the next opcode - bootrom disable timer shouldn't be needed, real ARM has already fetched the next opcode
- more accurate dynamic cpu clock divider (without the cost of emulation speed) - More accurate dynamic cpu clock divider, without the cost of emulation speed.
The current implementation catches almost everything, luckily ARM opcodes have a
fixed length. It only fails to detect ALU opcodes that directly modify pc(R15).
It also possibly has problems with very short subroutine calls from ROM to RAM,
but I tested for those and the shortest one is more than 50 cycles.
******************************************************************************/ ******************************************************************************/
@ -224,7 +228,7 @@ u32 risc2500_state::disable_boot_rom_r()
{ {
// disconnect bootrom from the bus after next opcode // disconnect bootrom from the bus after next opcode
if (m_bootrom_enabled && !m_disable_bootrom->enabled() && !machine().side_effects_disabled()) if (m_bootrom_enabled && !m_disable_bootrom->enabled() && !machine().side_effects_disabled())
m_disable_bootrom->adjust(m_maincpu->cycles_to_attotime(5)); m_disable_bootrom->adjust(m_maincpu->cycles_to_attotime(10));
return 0; return 0;
} }
@ -326,7 +330,7 @@ u32 risc2500_state::rom_r(offs_t offset)
if (diff >= 0) if (diff >= 0)
{ {
static constexpr int arm_branch_cycles = 3; static constexpr int arm_branch_cycles = 3;
static constexpr int arm_max_cycles = 17; // block data transfer static constexpr int arm_max_cycles = 17; // datablock transfer
static constexpr int divider = -8 + 1; static constexpr int divider = -8 + 1;
// this takes care of almost all cases, otherwise, total cycles taken can't be determined // this takes care of almost all cases, otherwise, total cycles taken can't be determined

9
src/mame/drivers/stfight.cpp
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@ -240,15 +240,16 @@ The sprites are mapped into RAM locations $F000-$FFFF using only the first
4 bytes from each 32-byte slice. Intervening addresses appear to be 4 bytes from each 32-byte slice. Intervening addresses appear to be
conventional RAM. See the memory map for sprite data format. conventional RAM. See the memory map for sprite data format.
**************************************************************************** ******************************************************************************
TODO: TODO:
- handle transparency in text layer properly (how?) - handle transparency in text layer properly (how?)
- second bank of sf02 is this used? (probably NOT) - second bank of sf02 is this used? (probably NOT)
- empcity/stfight never writes the YM2203s' divider registers but it expects - empcity/stfight never writes the YM2203s' divider registers but it expects
0x2f, there's a workaround for it in machine_start 0x2f, there's a workaround for it in machine_start
- empcity/stfight has an NMI handler, but it's not hooked up in MAME, missing - if empcity turns out to really be a bootleg, maybe it doesn't have an MCU,
comms somewhere? and instead does the ADPCM with the audiocpu? (see the driver notes above
mentioning an unused NMI handler)
- Each version of empcity/stfight has a different protection code stored in the - Each version of empcity/stfight has a different protection code stored in the
MCU (at $1D2) so each 68705 will need to be dumped. MCU (at $1D2) so each 68705 will need to be dumped.
We currently use hacked versions of the empcityu MCU for each different set. We currently use hacked versions of the empcityu MCU for each different set.
@ -266,7 +267,6 @@ TODO:
#include "includes/stfight.h" #include "includes/stfight.h"
#include "cpu/z80/z80.h" #include "cpu/z80/z80.h"
#include "sound/ym2203.h" #include "sound/ym2203.h"
#include "speaker.h" #include "speaker.h"
@ -457,7 +457,6 @@ INPUT_PORTS_END
void stfight_state::stfight_base(machine_config &config) void stfight_state::stfight_base(machine_config &config)
{ {
/* basic machine hardware */ /* basic machine hardware */

4
src/mame/drivers/tasc.cpp
View File

@ -180,7 +180,7 @@ u32 tasc_state::input_r()
{ {
// disconnect bootrom from the bus after next opcode // disconnect bootrom from the bus after next opcode
if (m_bootrom_enabled && !m_disable_bootrom->enabled()) if (m_bootrom_enabled && !m_disable_bootrom->enabled())
m_disable_bootrom->adjust(m_maincpu->cycles_to_attotime(5)); m_disable_bootrom->adjust(m_maincpu->cycles_to_attotime(10));
m_maincpu->set_input_line(ARM_FIRQ_LINE, CLEAR_LINE); m_maincpu->set_input_line(ARM_FIRQ_LINE, CLEAR_LINE);
} }
@ -234,7 +234,7 @@ u32 tasc_state::rom_r(offs_t offset)
if (diff >= 0) if (diff >= 0)
{ {
static constexpr int arm_branch_cycles = 3; static constexpr int arm_branch_cycles = 3;
static constexpr int arm_max_cycles = 17; // block data transfer static constexpr int arm_max_cycles = 17; // datablock transfer
static constexpr int divider = -7 + 1; static constexpr int divider = -7 + 1;
// this takes care of almost all cases, otherwise, total cycles taken can't be determined // this takes care of almost all cases, otherwise, total cycles taken can't be determined