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bbc: the direct update handler is supposed not to be useful anymore [N. Barnes, O. Galibert]

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This commit is contained in:
Olivier Galibert 2017-03-31 18:36:49 +02:00
parent 080dc67aba
commit 6cf3bc983e
2 changed files with 0 additions and 63 deletions
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2
src/mame/includes/bbc.h
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@ -139,8 +139,6 @@ public:
DECLARE_WRITE8_MEMBER(bbcm_wd1772l_write);
DECLARE_WRITE8_MEMBER(bbc_videoULA_w);
DECLARE_READ8_MEMBER(bbc_fe_r);
DECLARE_DIRECT_UPDATE_MEMBER(bbcbp_direct_handler);
DECLARE_DIRECT_UPDATE_MEMBER(bbcm_direct_handler);
DECLARE_DRIVER_INIT(bbc);
DECLARE_VIDEO_START(bbc);

61
src/mame/machine/bbc.cpp
View File

@ -145,41 +145,6 @@ WRITE8_MEMBER(bbc_state::bbc_memorybp1_w)
}
/* the next two function handle reads and write to the shadow video ram area
between 0x3000 and 0x7fff
when vdusel is set high the video display uses the shadow ram memory
the processor only reads and write to the shadow ram when vdusel is set
and when the instruction being executed is stored in a set range of memory
addresses known as the VDU driver instructions.
*/
DIRECT_UPDATE_MEMBER(bbc_state::bbcbp_direct_handler)
{
uint8_t *RAM = m_region_maincpu->base();
if (m_vdusel == 0)
{
// not in shadow ram mode so just read normal ram
m_bank2->set_base(RAM + 0x3000);
}
else
{
if (vdudriverset())
{
// if VDUDriver set then read from shadow ram
m_bank2->set_base(RAM + 0xb000);
}
else
{
// else read from normal ram
m_bank2->set_base(RAM + 0x3000);
}
}
return address;
}
WRITE8_MEMBER(bbc_state::bbc_memorybp2_w)
{
uint8_t *RAM = m_region_maincpu->base();
@ -401,28 +366,6 @@ WRITE8_MEMBER(bbc_state::bbc_memorybm1_w)
}
DIRECT_UPDATE_MEMBER(bbc_state::bbcm_direct_handler)
{
if (m_ACCCON_X)
{
m_bank2->set_base(m_region_maincpu->base() + 0xb000);
}
else
{
if (m_ACCCON_E && bbcm_vdudriverset())
{
m_bank2->set_base(m_region_maincpu->base() + 0xb000);
}
else
{
m_bank2->set_base(m_region_maincpu->base() + 0x3000);
}
}
return address;
}
WRITE8_MEMBER(bbc_state::bbc_memorybm2_w)
{
@ -1788,8 +1731,6 @@ MACHINE_START_MEMBER(bbc_state, bbcbp)
m_machinetype = BPLUS;
m_mc6850_clock = 0;
m_maincpu->space(AS_PROGRAM).set_direct_update_handler(direct_update_delegate(&bbc_state::bbcbp_direct_handler, this));
bbc_setup_banks(m_bank4, 16, 0, 0x3000);
m_bank4->configure_entries(16, 1, m_region_maincpu->base() + 0x8000, 0x3000); // additional bank for paged ram
bbc_setup_banks(m_bank6, 16, 0x3000, 0x1000);
@ -1816,8 +1757,6 @@ MACHINE_START_MEMBER(bbc_state, bbcm)
m_machinetype = MASTER;
m_mc6850_clock = 0;
m_maincpu->space(AS_PROGRAM).set_direct_update_handler(direct_update_delegate(&bbc_state::bbcm_direct_handler, this));
bbcm_setup_banks(m_bank4, 16, 0, 0x1000);
m_bank4->configure_entries(16, 1, m_region_maincpu->base() + 0x8000, 0x1000); // additional bank for paged ram
bbcm_setup_banks(m_bank5, 16, 0x1000, 0x3000);