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chessking: assume 0x7f is cartridge rom bank

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This commit is contained in:
hap 2022-12-27 19:57:31 +01:00
parent 2511ea04d2
commit a165ca3b88
1 changed files with 20 additions and 19 deletions
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39
src/mame/handheld/chessking.cpp
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@ -18,13 +18,14 @@ Main:
- NEC D70108HG-10 V20, 9.600MHz XTAL
- 64KB ROM (2*SRM20256), 256KB ROM (custom label)
- unknown 80 pin QFP, label CCH01 ET-MATE F3X0 713, assume custom I/O chip
- 1-bit sound
- cartridge slot
LCD module:
- PCB label: P102-2, DATA VISION
- 2*Hitachi HD66204F, Hitachi HD66205F
- unknown 80 pin QFP, label 16160 S2RB 94.10
- 160*160 LCD screen
- 2bpp 160*160 LCD screen
*/
@ -73,7 +74,7 @@ private:
void irq_clear_w(uint8_t data);
void unk_5f_w(uint8_t data);
void unk_6f_w(uint8_t data);
void unk_7f_w(uint8_t data);
void cart_bank_w(uint8_t data);
void beeper_freq_low_w(uint8_t data);
void beeper_freq_high_w(uint8_t data);
void beeper_enable_w(uint8_t data);
@ -135,11 +136,13 @@ uint32_t chessking_state::screen_update(screen_device &screen, bitmap_rgb32 &bit
void chessking_state::unk_1f_w(uint8_t data)
{
// writes at start-up only
logerror("%s: 1f write %02x\n", machine().describe_context(), data);
}
void chessking_state::unk_2f_w(uint8_t data)
{
// writes at start-up only
logerror("%s: 2f write %02x\n", machine().describe_context(), data);
}
@ -152,6 +155,7 @@ uint8_t chessking_state::unk_3f_r()
void chessking_state::unk_3f_w(uint8_t data)
{
// writes frequently, at the same times as 7f/8f/9f/af writes, note address is also read
//logerror("%s: 3f write %02x\n", machine().describe_context(), data);
m_3f_data = data;
}
@ -164,6 +168,7 @@ void chessking_state::irq_clear_w(uint8_t data)
void chessking_state::unk_5f_w(uint8_t data)
{
// writes at start-up only
logerror("%s: 5f write %02x\n", machine().describe_context(), data);
}
@ -172,10 +177,10 @@ void chessking_state::unk_6f_w(uint8_t data)
logerror("%s: 6f write %02x\n", machine().describe_context(), data);
}
void chessking_state::unk_7f_w(uint8_t data)
void chessking_state::cart_bank_w(uint8_t data)
{
// writes values from 0x07 to 0x00 before menu appears, also writes 0x00 / 0x01 when audio is playing
logerror("%s: 7f write %02x\n", machine().describe_context(), data);
// writes values from 0x07 to 0x00 before checking cartridge
//logerror("%s: 7f write %02x\n", machine().describe_context(), data);
}
@ -225,20 +230,16 @@ void chessking_state::chesskng_map(address_map &map)
void chessking_state::chesskng_io(address_map &map)
{
map(0x0f, 0x0f).portr("BUTTONS");
map(0x3f, 0x3f).r(FUNC(chessking_state::unk_3f_r));
map(0x1f, 0x1f).w(FUNC(chessking_state::unk_1f_w)); // start-up only
map(0x2f, 0x2f).w(FUNC(chessking_state::unk_2f_w)); // start-up only
map(0x3f, 0x3f).w(FUNC(chessking_state::unk_3f_w)); // frequently, at the same times as 7f/8f/9f/af writes, note address is also read
map(0x4f, 0x4f).w(FUNC(chessking_state::irq_clear_w)); // irq clear?
map(0x5f, 0x5f).w(FUNC(chessking_state::unk_5f_w)); // start-up only
map(0x6f, 0x6f).w(FUNC(chessking_state::unk_6f_w)); // less frequently than below
// are these all sound related? they all occur when sounds might be expected
map(0x7f, 0x7f).w(FUNC(chessking_state::unk_7f_w)); // frequently written at a similar time to the audio
map(0x8f, 0x8f).w(FUNC(chessking_state::beeper_freq_low_w)); // beeper freq low?
map(0x9f, 0x9f).w(FUNC(chessking_state::beeper_freq_high_w)); // beeper freq high?
map(0xaf, 0xaf).w(FUNC(chessking_state::beeper_enable_w)); // beeper enable?
map(0x1f, 0x1f).w(FUNC(chessking_state::unk_1f_w));
map(0x2f, 0x2f).w(FUNC(chessking_state::unk_2f_w));
map(0x3f, 0x3f).rw(FUNC(chessking_state::unk_3f_r), FUNC(chessking_state::unk_3f_w));
map(0x4f, 0x4f).w(FUNC(chessking_state::irq_clear_w));
map(0x5f, 0x5f).w(FUNC(chessking_state::unk_5f_w));
map(0x6f, 0x6f).w(FUNC(chessking_state::unk_6f_w));
map(0x7f, 0x7f).w(FUNC(chessking_state::cart_bank_w));
map(0x8f, 0x8f).w(FUNC(chessking_state::beeper_freq_low_w));
map(0x9f, 0x9f).w(FUNC(chessking_state::beeper_freq_high_w));
map(0xaf, 0xaf).w(FUNC(chessking_state::beeper_enable_w));
}