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vamphalf.cpp: document wyvernwg protection

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This commit is contained in:
angelosa 2022-03-17 13:30:30 +01:00
parent 344d4b723c
commit 891c569e2f
1 changed files with 18 additions and 1 deletions
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19
src/mame/drivers/vamphalf.cpp
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@ -55,7 +55,7 @@ TODO:
- boonggab: simulate photo sensors with a "stroke strength"
- boonggab: what are sensors bit used for? are they used in the japanese version?
- misncrft: sound dies during stage 1-5;
- wyvernsg: fails a protection check after ~1 hour of play?
- wyvernsg: fails a protection check after ~1 hour of play? (PC=f6ac)
*********************************************************************/
@ -277,6 +277,8 @@ private:
u32 wyvernwg_prot_r();
void wyvernwg_prot_w(u32 data);
u32 wyvernwg_parallel_prot_r();
void wyvernwg_parallel_prot_w(u32 data);
void yorijori_eeprom_w(u32 data);
@ -395,6 +397,20 @@ u32 vamphalf_qdsp_state::wyvernwg_prot_r()
return (m_semicom_prot_data[m_semicom_prot_which] & (1 << m_semicom_prot_idx)) >> m_semicom_prot_idx;
}
// tested with 16 words seed after ~1 hour
// Looks a similar pattern to Mission Craft except parallel instead of serial
// TODO: it changes seed depending on number of credits being inserted
u32 vamphalf_qdsp_state::wyvernwg_parallel_prot_r()
{
return 0x08;
}
void vamphalf_qdsp_state::wyvernwg_parallel_prot_w(u32 data)
{
printf("%04x\n", data);
}
void vamphalf_qdsp_state::wyvernwg_prot_w(u32 data)
{
m_semicom_prot_which = data & 1;
@ -684,6 +700,7 @@ void vamphalf_qdsp_state::wyvernwg_io(address_map &map)
map(0x2800, 0x2803).portr("P1_P2");
map(0x3000, 0x3003).portr("SYSTEM");
map(0x5400, 0x5403).w(m_soundlatch, FUNC(generic_latch_8_device::write)).umask32(0x000000ff).cswidth(32);
map(0x6000, 0x6003).rw(FUNC(vamphalf_qdsp_state::wyvernwg_parallel_prot_r), FUNC(vamphalf_qdsp_state::wyvernwg_parallel_prot_w));
map(0x7000, 0x7003).w(FUNC(vamphalf_state::eeprom32_w));
map(0x7c00, 0x7c03).r(FUNC(vamphalf_state::eeprom32_r));
}