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abc1600: Fixed floppy DMA. [Curt Coder]

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This commit is contained in:
Curt Coder 2020-04-18 12:41:33 +03:00
parent 056e795dd3
commit 8c333311f1
3 changed files with 17 additions and 5 deletions
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12
src/devices/bus/abcbus/abcbus.cpp
View File

@ -50,8 +50,16 @@ abcbus_slot_device::abcbus_slot_device(const machine_config &mconfig, const char
m_write_xint2(*this),
m_write_xint3(*this),
m_write_xint4(*this),
m_write_xint5(*this), m_card(nullptr), m_irq(0), m_nmi(0), m_pren(0),
m_trrq(0), m_xint2(0), m_xint3(0), m_xint4(0), m_xint5(0)
m_write_xint5(*this),
m_card(nullptr),
m_irq(CLEAR_LINE),
m_nmi(CLEAR_LINE),
m_pren(1),
m_trrq(1),
m_xint2(CLEAR_LINE),
m_xint3(CLEAR_LINE),
m_xint4(CLEAR_LINE),
m_xint5(CLEAR_LINE)
{
}

2
src/mame/drivers/abc1600.cpp
View File

@ -34,8 +34,6 @@
TODO:
- starting from MAME 0.151, the Z80 DMA reads 0x08 as the 257th byte to transfer from disk t0s14 thus failing a comparison @ 37cfa, leading to a watchdog reset
changing z80dma.cpp:480 to "done = (m_count == 0);" fixes this but isn't the real reason
- segment/page RAM addresses are not correctly decoded, "sas/format/format" after abcenix is booted can't find the SASI interface because of this
[:mac] ':3f' (08A98) MAC 7e4a2:0004a2 (SEGA 02f SEGD 09 PGA 09c PGD 8000 NONX 1 WP 0)
should be

8
src/mame/machine/abc1600mac.cpp
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@ -18,6 +18,7 @@
#define LOG 0
#define LOG_MAC 0
#define LOG_DMA 0
#define LOG_IO 0
#define A0 BIT(offset, 0)
@ -245,8 +246,11 @@ uint8_t abc1600_mac_device::read_user_memory(offs_t offset)
{
int nonx = 0, wp = 0;
offs_t virtual_offset = translate_address(offset, &nonx, &wp);
uint8_t data = space().read_byte(virtual_offset);
return space().read_byte(virtual_offset);
if (LOG_IO && virtual_offset >= 0x1fe000) logerror("%s user read %06x:%02x\n", machine().describe_context(), virtual_offset, data);
return data;
}
@ -261,6 +265,8 @@ void abc1600_mac_device::write_user_memory(offs_t offset, uint8_t data)
//if (nonx || !wp) return;
if (LOG_IO && virtual_offset >= 0x1fe000) logerror("%s user write %06x:%02x\n", machine().describe_context(), virtual_offset, data);
space().write_byte(virtual_offset, data);
}