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This is part 1 of 2
* Proper emulator timing is critical for emulating the Apple2 speaker with a
square wave on a modern soundcard. The AppleWin sources provided
reference, inspiration, and source for both timing and speaker emulation
code.
* cpu.S, cpu.h, timing.c : OK so I flip-flopped quite a bit here on how best
to do proper emulator timing, but the previous spinloop implementation was
not one of my more enlightened decisions :P ... cpu/power consumption
nightmare ...
* ds-shim.h, win-shim.h -- Shims for Windows-isms and DirectSound-isms. I
assume these will eventually be refactored away...
* soundcore.[hc], speaker.[hc] -- Directly ported from a recent version of
AppleWin. Everything I've added should be braced with #ifdef APPLE2IX.
* soundcore-alsa.[hc] -- An ALSA backend using mmap'ed soundcard access.
62 lines
1.2 KiB
C
62 lines
1.2 KiB
C
/*
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* Apple // emulator for *nix
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*
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* This software package is subject to the GNU General Public License
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* version 2 or later (your choice) as published by the Free Software
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* Foundation.
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*
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* THERE ARE NO WARRANTIES WHATSOEVER.
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*
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*/
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/*
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* 65c02 CPU Timing Support.
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*
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* Copyleft 2013 Aaron Culliney
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*
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*/
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#ifndef _TIMING_H_
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#define _TIMING_H_
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#include "common.h"
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#define NANOSECONDS 1000000000
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// timing values cribbed from AppleWin
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// 14318181.81...
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#define _M14 (157500000.0 / 11.0)
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// 65 cycles per 912 14M clocks = 1020484.45...
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#define CLK_6502 ((_M14 * 65.0) / 912.0)
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#define CPU_SCALE_SLOWEST 0.25
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#define CPU_SCALE_FASTEST 4.005
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#define CPU_SCALE_STEP_DIV 0.01
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#define CPU_SCALE_STEP 0.05
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#define SPKR_SAMPLE_RATE 44100
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extern double g_fCurrentCLK6502;
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extern bool g_bFullSpeed;
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extern uint64_t g_nCumulativeCycles;
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extern int g_nCpuCyclesFeedback;
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extern double cpu_scale_factor;
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struct timespec timespec_diff(struct timespec start, struct timespec end, bool *negative);
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bool timing_is_fullspeed();
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void timing_enable_fullspeed();
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void timing_enable_regular_speed();
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void timing_initialize();
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void cpu_thread();
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void CpuCalcCycles(const unsigned long nExecutedCycles);
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#endif // whole file
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