mirror of
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
91 lines
2.5 KiB
C
91 lines
2.5 KiB
C
/*****************************************************************************
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*
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* Xerox AltoII cursor 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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/**
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* @brief disable the cursor task and set the curt_blocks flag
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*/
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void alto2_cpu_device::f1_early_curt_block()
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{
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m_dsp.curt_blocks = true;
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m_task_wakeup &= ~(1 << m_task);
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LOG((LOG_CURT,2," BLOCK %s\n", task_name(m_task)));
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}
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/**
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* @brief f2_load_xpreg late: load the x position register from BUS[6-15]
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*/
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void alto2_cpu_device::f2_late_load_xpreg()
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{
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m_dsp.xpreg = X_RDBITS(m_bus,16,6,15);
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LOG((LOG_CURT, 9," XPREG<- BUS[6-15] (%#o)\n", m_dsp.xpreg));
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}
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/**
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* @brief f2_load_csr late: load the cursor shift register from BUS[0-15]
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*
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* Shift CSR to xpreg % 16 position to make it easier to
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* to handle the word xor in unload_word().
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* <PRE>
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* xpreg % 16 cursor bits
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* [ first word ][ second word ]
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* ----------------------------------------------
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* 0 xxxxxxxxxxxxxxxx0000000000000000
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* 1 0xxxxxxxxxxxxxxxx000000000000000
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* 2 00xxxxxxxxxxxxxxxx00000000000000
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* ...
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* 14 00000000000000xxxxxxxxxxxxxxxx00
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* 15 000000000000000xxxxxxxxxxxxxxxx0
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* </PRE>
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*/
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void alto2_cpu_device::f2_late_load_csr()
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{
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m_dsp.csr = m_bus;
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LOG((LOG_CURT, m_dsp.csr ? 2 : 9," CSR<- BUS (%#o)\n", m_dsp.csr));
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}
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/**
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* @brief curt_activate: called by the CPU when the cursor task becomes active
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*/
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void alto2_cpu_device::activate_curt()
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{
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m_task_wakeup &= ~(1 << m_task);
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m_dsp.curt_wakeup = false;
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int x = 01777 - m_dsp.xpreg;
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UINT32 bits = m_dsp.csr << (16 - (x & 15));
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m_dsp.cursor0 = static_cast<UINT16>(bits >> 16);
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m_dsp.cursor1 = static_cast<UINT16>(bits);
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m_dsp.curxpos = x / 16;
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}
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/** @brief initialize the cursor task F1 and F2 functions */
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void alto2_cpu_device::init_curt(int task)
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{
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set_f1(task, f1_block, &alto2_cpu_device::f1_early_curt_block, 0);
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set_f2(task, f2_curt_load_xpreg, 0, &alto2_cpu_device::f2_late_load_xpreg);
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set_f2(task, f2_curt_load_csr, 0, &alto2_cpu_device::f2_late_load_csr);
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m_active_callback[task] = &alto2_cpu_device::activate_curt;
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}
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void alto2_cpu_device::exit_curt()
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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_curt()
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{
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m_dsp.curt_blocks = false;
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m_dsp.xpreg = 0;
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m_dsp.csr = 0;
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m_dsp.curxpos = 0;
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m_dsp.cursor0 = m_dsp.cursor1 = 0;
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}
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