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at: eop needs to apply immediately or the fdc errors out (nw)

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This commit is contained in:
cracyc 2018-06-01 13:30:51 -05:00
parent fd41b35c2a
commit e99efd87bc
2 changed files with 11 additions and 7 deletions
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15
src/mame/machine/at.cpp
View File

@ -14,7 +14,6 @@
#include "bus/pc_kbd/pc_kbdc.h"
#include "softlist_dev.h"
#include "speaker.h"
#include "machine/input_merger.h"
#define LOG_PORT80 0
@ -62,12 +61,9 @@ MACHINE_CONFIG_START(at_mb_device::device_add_mconfig)
MCFG_PIT8253_CLK2(4772720/4) /* pio port c pin 4, and speaker polling enough */
MCFG_PIT8253_OUT2_HANDLER(WRITELINE(*this, at_mb_device, pit8254_out2_changed))
MCFG_INPUT_MERGER_ANY_LOW("eop")
MCFG_INPUT_MERGER_OUTPUT_HANDLER(WRITELINE(*this, at_mb_device, dma8237_out_eop))
MCFG_DEVICE_ADD("dma8237_1", AM9517A, 14.318181_MHz_XTAL / 3)
MCFG_I8237_OUT_HREQ_CB(WRITELINE("dma8237_2", am9517a_device, dreq0_w))
MCFG_I8237_OUT_EOP_CB(WRITELINE("eop", input_merger_device, in_w<0>))
MCFG_I8237_OUT_EOP_CB(WRITELINE(*this, at_mb_device, dma8237_out_eop))
MCFG_I8237_IN_MEMR_CB(READ8(*this, at_mb_device, dma_read_byte))
MCFG_I8237_OUT_MEMW_CB(WRITE8(*this, at_mb_device, dma_write_byte))
MCFG_I8237_IN_IOR_0_CB(READ8(*this, at_mb_device, dma8237_0_dack_r))
@ -85,7 +81,7 @@ MACHINE_CONFIG_START(at_mb_device::device_add_mconfig)
MCFG_DEVICE_ADD( "dma8237_2", AM9517A, 14.318181_MHz_XTAL / 3)
MCFG_I8237_OUT_HREQ_CB(WRITELINE(*this, at_mb_device, dma_hrq_changed))
MCFG_I8237_OUT_EOP_CB(WRITELINE("eop", input_merger_device, in_w<1>))
MCFG_I8237_OUT_EOP_CB(WRITELINE(*this, at_mb_device, dma8237_2_out_eop))
MCFG_I8237_IN_MEMR_CB(READ8(*this, at_mb_device, dma_read_word))
MCFG_I8237_OUT_MEMW_CB(WRITE8(*this, at_mb_device, dma_write_word))
MCFG_I8237_IN_IOR_1_CB(READ8(*this, at_mb_device, dma8237_5_dack_r))
@ -342,6 +338,13 @@ WRITE_LINE_MEMBER( at_mb_device::dma8237_out_eop )
m_isabus->eop_w(m_dma_channel, m_cur_eop ? ASSERT_LINE : CLEAR_LINE );
}
WRITE_LINE_MEMBER( at_mb_device::dma8237_2_out_eop )
{
m_cur_eop2 = state == ASSERT_LINE;
if(m_dma_channel != -1)
m_isabus->eop_w(m_dma_channel, m_cur_eop2 ? ASSERT_LINE : CLEAR_LINE );
}
void at_mb_device::set_dma_channel(int channel, int state)
{
if(!state) {

3
src/mame/machine/at.h
View File

@ -50,7 +50,7 @@ private:
uint8_t m_at_spkrdata;
uint8_t m_pit_out2;
int m_dma_channel;
bool m_cur_eop;
bool m_cur_eop, m_cur_eop2;
uint8_t m_dma_offset[2][4];
uint8_t m_at_pages[0x10];
uint16_t m_dma_high_byte;
@ -61,6 +61,7 @@ private:
DECLARE_WRITE_LINE_MEMBER(pit8254_out2_changed);
DECLARE_WRITE_LINE_MEMBER(dma8237_out_eop);
DECLARE_WRITE_LINE_MEMBER(dma8237_2_out_eop);
DECLARE_READ8_MEMBER(dma8237_0_dack_r);
DECLARE_READ8_MEMBER(dma8237_1_dack_r);
DECLARE_READ8_MEMBER(dma8237_2_dack_r);