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https://github.com/holub/mame
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c046734f76
out of whatsnew: Did not add Unicode support for debugger from branch yet, for now few special chars are converted to be plain ASCII
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/*****************************************************************************
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*
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* Xerox AltoII display word task
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*
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* Copyright Juergen Buchmueller <pullmoll@t-online.de>
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*
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* Licenses: MAME, GPLv2
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*
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*****************************************************************************/
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#include "alto2cpu.h"
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//! PROM a38 bit O1 is STOPWAKE' (stop DWT if bit is zero)
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#define FIFO_STOPWAKE(a38) (0 == (a38 & disp_a38_STOPWAKE) ? true : false)
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/**
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* @brief block the display word task
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*/
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void alto2_cpu_device::f1_early_dwt_block()
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{
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m_dsp.dwt_blocks = true;
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/* clear the wakeup for the display word task */
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m_task_wakeup &= ~(1 << m_task);
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LOG((LOG_DWT,2," BLOCK %s\n", task_name(m_task)));
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/* wakeup the display horizontal task, if it didn't block itself */
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if (!m_dsp.dht_blocks)
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m_task_wakeup |= 1 << task_dht;
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}
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/**
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* @brief load the display data register
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*/
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void alto2_cpu_device::f2_late_dwt_load_ddr()
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{
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LOG((LOG_DWT,2," DDR<- BUS (%#o)\n", m_bus));
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m_dsp.fifo[m_dsp.wa] = m_bus;
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m_dsp.wa = (m_dsp.wa + 1) % ALTO2_DISPLAY_FIFO;
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UINT8 a38 = m_disp_a38[m_dsp.ra * 16 + m_dsp.wa];
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if (FIFO_STOPWAKE(a38))
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m_task_wakeup &= ~(1 << task_dwt);
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LOG((LOG_DWT,2, " DWT push %04x into FIFO[%02o]%s\n",
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m_bus, (m_dsp.wa - 1) & (ALTO2_DISPLAY_FIFO - 1),
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FIFO_STOPWAKE(a38) ? " STOPWAKE" : ""));
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}
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void alto2_cpu_device::init_dwt(int task)
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{
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set_f1(task, f1_block, &alto2_cpu_device::f1_early_dwt_block, 0);
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set_f2(task, f2_dwt_load_ddr, 0, &alto2_cpu_device::f2_late_dwt_load_ddr);
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}
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void alto2_cpu_device::exit_dwt()
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{
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// nothing to do yet
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}
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void alto2_cpu_device::reset_dwt()
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{
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m_dsp.dwt_blocks = false;
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memset(m_dsp.fifo, 0, sizeof(m_dsp.fifo));
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m_dsp.wa = 0;
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m_dsp.ra = 0;
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}
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