57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
//
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// pia.h
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// apple1
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//
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// Created by Daniel Loffgren on 9/12/15.
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// Copyright (c) 2015 Daniel Loffgren. All rights reserved.
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//
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#ifndef __apple1__pia__
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#define __apple1__pia__
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#include <v6502/cpu.h>
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#include <curses.h>
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#define A1PIA_KEYBOARD_INPUT_REGISTER 0xD010
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#define A1PIA_KEYBOARD_READY_REGISTER 0xD011
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#define A1PIA_VIDEO_OUTPUT_REGISTER 0xD012
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#define A1PIA_VIDEO_ATTR_REGISTER 0xD013
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typedef struct {
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/** @brief Curses output object */
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WINDOW *screen;
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/** @brief Hardwired cpu used to trap video activity and report
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* keyboard input back via memory mapped registers. */
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v6502_cpu *cpu;
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char buf;
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int signalled;
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int suspended;
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char history[2048];
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int hist_pos;
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} a1pia;
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a1pia *pia_create(v6502_cpu *cpu);
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void pia_destroy(a1pia *pia);
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void pia_start(a1pia *pia, int continuous);
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void pia_stop(a1pia *pia);
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/* The freeze format is as follows:
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* 0x00000-0x0FFFF: The contents of memory
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* 0x10001-0x10002: CPU Program Counter (Network byte order)
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* 0x10003: CPU Accumulator
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* 0x10004: CPU X Register
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* 0x10005: CPU Y Register
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* 0x10006: CPU Status Register
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* 0x10007-0x10807: Video Buffer History
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*
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* The video buffer history is a 2 kilobyte ring buffer that is preserved
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* by the PIA. On load, it is replayed, which should restore the video
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* output to a pretty close approximation, depending on terminal size and
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* history.
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*/
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void saveFreeze(a1pia *pia, const char *fname);
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void loadFreeze(a1pia *pia, const char *fname);
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#endif /* defined(__apple1__pia__) */
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