Apple-1-Tools/Ryukojiro-apple1
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Refactored PIA code to bind to a CPU, rather than just the memory bus. This way it can also be in charge of freezing the entire machine state. Also added 2k of character history for buffering video state.

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git-svn-id: svn+ssh://svn.phoenixbox.net/svn/apple1/trunk@74 64f78de7-aa59-e511-a0e8-0002a5492df0
This commit is contained in:
Daniel Loffgren 2015-12-19 23:29:19 +00:00
parent c85e809cf2
commit 047eaf800f
3 changed files with 33 additions and 15 deletions
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2
apple1/main.c
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@ -112,7 +112,7 @@ int main(int argc, const char * argv[])
// Attach PIA
printf("Initializing PIA...\n");
pia = pia_create(cpu->memory);
pia = pia_create(cpu);
printf("Resetting CPU...\n");
v6502_reset(cpu);

18
apple1/pia.c
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@ -18,7 +18,7 @@
#define KEYBOARD_NOTREADY 0x00
#define ANSI_BGCOLOR_GREEN "\x1b[42;1m"
void saveFreeze(v6502_memory *mem, const char *fname) {
void saveFreeze(a1pia *pia, const char *fname) {
FILE *f = fopen(fname, "w");
if (!f) {
endwin();
@ -26,7 +26,7 @@ void saveFreeze(v6502_memory *mem, const char *fname) {
}
for (uint16_t offset = 0; offset < v6502_memoryStartCeiling; offset++) {
uint8_t byte = v6502_read(mem, offset, NO);
uint8_t byte = v6502_read(pia->cpu->memory, offset, NO);
fwrite(&byte, sizeof(uint8_t), 1, f);
}
@ -87,8 +87,6 @@ uint8_t keyboardReadReadyCallback(struct _v6502_memory *memory, uint16_t offset,
return KEYBOARD_READY;
}
saveFreeze(memory, "freeze.ram");
if (context->suspended) {
printf("Keyboard readiness register ($D011) trap read.\n");
printf("Press a key for input to keyboard register ($D010): ");
@ -133,16 +131,16 @@ uint8_t keyboardReadCharacterCallback(struct _v6502_memory *memory, uint16_t off
return 0;
}
a1pia *pia_create(v6502_memory *mem) {
a1pia *pia_create(v6502_cpu *cpu) {
a1pia *pia = malloc(sizeof(a1pia));
pia->memory = mem;
pia->cpu = cpu;
pia->screen = NULL;
pia->buf = '\0';
assert(v6502_map(mem, A1PIA_KEYBOARD_INPUT_REGISTER, 1, (v6502_readFunction *)keyboardReadCharacterCallback, NULL, pia));
assert(v6502_map(mem, A1PIA_KEYBOARD_READY_REGISTER, 1, (v6502_readFunction *)keyboardReadReadyCallback, NULL, pia));
assert(v6502_map(mem, A1PIA_VIDEO_OUTPUT_REGISTER, 1, FIXME_I_SHOULDNT_BE_NULL, (v6502_writeFunction *)videoWriteCharCallback, pia));
assert(v6502_map(mem, A1PIA_VIDEO_ATTR_REGISTER, 1, FIXME_I_SHOULDNT_BE_NULL, (v6502_writeFunction *)videoWriteNewlineCallback, pia));
assert(v6502_map(cpu->memory, A1PIA_KEYBOARD_INPUT_REGISTER, 1, (v6502_readFunction *)keyboardReadCharacterCallback, NULL, pia));
assert(v6502_map(cpu->memory, A1PIA_KEYBOARD_READY_REGISTER, 1, (v6502_readFunction *)keyboardReadReadyCallback, NULL, pia));
assert(v6502_map(cpu->memory, A1PIA_VIDEO_OUTPUT_REGISTER, 1, FIXME_I_SHOULDNT_BE_NULL, (v6502_writeFunction *)videoWriteCharCallback, pia));
assert(v6502_map(cpu->memory, A1PIA_VIDEO_ATTR_REGISTER, 1, FIXME_I_SHOULDNT_BE_NULL, (v6502_writeFunction *)videoWriteNewlineCallback, pia));
return pia;
}

28
apple1/pia.h
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@ -9,7 +9,7 @@
#ifndef __apple1__pia__
#define __apple1__pia__
#include <v6502/mem.h>
#include <v6502/cpu.h>
#include <curses.h>
#define A1PIA_KEYBOARD_INPUT_REGISTER 0xD010
@ -20,17 +20,37 @@
typedef struct {
/** @brief Curses output object */
WINDOW *screen;
/** @brief Hardwired memory used to trap video activity and report keyboard input */
v6502_memory *memory;
/** @brief Hardwired cpu used to trap video activity and report
* keyboard input back via memory mapped registers. */
v6502_cpu *cpu;
char buf;
int signalled;
int suspended;
char history[2048];
int hist_pos;
} a1pia;
a1pia *pia_create(v6502_memory *mem);
a1pia *pia_create(v6502_cpu *cpu);
void pia_destroy(a1pia *pia);
void pia_start(a1pia *pia, int continuous);
void pia_stop(a1pia *pia);
/* The freeze format is as follows:
* 0x00000-0x0FFFF: The contents of memory
* 0x10001-0x10002: CPU Program Counter
* 0x10003: CPU Accumulator
* 0x10004: CPU X Register
* 0x10005: CPU Y Register
* 0x10006: CPU Status Register
* 0x10007-0x10807: Video Buffer History
*
* The video buffer history is a 2 kilobyte ring buffer that is preserved
* by the PIA. On load, it is replayed, which should restore the video
* output to a pretty close approximation, depending on terminal size and
* history.
*/
void saveFreeze(a1pia *pia, const char *fname);
void loadFreeze(a1pia *pia, const char *fname);
#endif /* defined(__apple1__pia__) */