diff options
Diffstat (limited to 'src/devices/cpu/alto2/a2dvt.c')
-rw-r--r-- | src/devices/cpu/alto2/a2dvt.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/src/devices/cpu/alto2/a2dvt.c b/src/devices/cpu/alto2/a2dvt.c new file mode 100644 index 00000000000..acb51d92e7c --- /dev/null +++ b/src/devices/cpu/alto2/a2dvt.c @@ -0,0 +1,46 @@ +// license:BSD-3-Clause +// copyright-holders:Juergen Buchmueller +/***************************************************************************** + * + * Xerox AltoII display vertical task + * + *****************************************************************************/ +#include "alto2cpu.h" + +/** + * @brief f1_dvt_block early: disable the display word task + */ +void alto2_cpu_device::f1_early_dvt_block() +{ +// m_task_wakeup &= ~(1 << m_task); + LOG((LOG_DVT,2," BLOCK %s\n", task_name(m_task))); +} + + +/** + * @brief called by the CPU when the display vertical task becomes active + */ +void alto2_cpu_device::activate_dvt() +{ + m_task_wakeup &= ~(1 << m_task); +} + +/** + * @brief initialize display vertical task + */ +void alto2_cpu_device::init_dvt(int task) +{ + set_f1(task, f1_block, &alto2_cpu_device::f1_early_dvt_block, 0); + set_f2(task, f2_dvt_evenfield, 0, &alto2_cpu_device::f2_late_evenfield); + m_active_callback[task] = &alto2_cpu_device::activate_dvt; +} + +void alto2_cpu_device::exit_dvt() +{ + // nothing to do yet +} + +void alto2_cpu_device::reset_dvt() +{ + // nothing to do yet +} |