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reinette-II
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Update reinette-II.c

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ArthurFerreira2 2019-04-19 21:33:40 +02:00 committed by GitHub
parent a0c32d6c40
commit daf04c9130
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1 changed files with 37 additions and 46 deletions
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reinette-II.c
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@ -25,18 +25,18 @@
#include <ncurses.h>
#define ROMSTART 0xD000
#define ROMSIZE 0x3000 // 12KB
#define RAMSIZE 0xC000 // 48KB
#define CARRY 0x01
#define ZERO 0x02
#define CARRY 0x01
#define ZERO 0x02
#define INTERRUPT 0x04
#define DECIMAL 0x08
#define BREAK 0x10
#define DECIMAL 0x08
#define BREAK 0x10
#define UNDEFINED 0x20
#define OVERFLOW 0x40
#define SIGN 0x80
#define OVERFLOW 0x40
#define SIGN 0x80
#define ROMSTART 0xD000
#define ROMSIZE 0x3000 // 12KB
#define RAMSIZE 0xC000 // 48KB
uint8_t rom[ROMSIZE];
uint8_t ram[RAMSIZE];
@ -58,36 +58,24 @@ bool videoNeedsRefresh = true;
// MEMORY AND I/O
static uint8_t readMem(uint16_t address){
if (address < RAMSIZE) return(ram[address]);
else if (address >= ROMSTART) return(rom[address - ROMSTART]);
else if (address == 0xC000) return(key); // KBD
else if (address == 0xC010){ // KBDSTRB
key &= 0x7F; // unset bit 7
if (address < RAMSIZE) return(ram[address]);
if (address >= ROMSTART) return(rom[address - ROMSTART]);
if (address == 0xC000) return(key); // KBD
if (address == 0xC010){ // KBDSTRB
key &= 0x7F; // unset bit 7
return(key);
}
else return(0); // catch all
return(0); // catch all
}
static void writeMem(uint16_t address, uint8_t value){
if (address & 0x400) videoNeedsRefresh = true; // a change in text page 1
if (address & 0x400) videoNeedsRefresh = true; // a change in text page 1
if (address < RAMSIZE) ram[address] = value;
else if (address == 0xC010) key &= 0x7F; // KBDSTRB, similar as in readMem
else if (address == 0xC010) key &= 0x7F; // KBDSTRB, as in readMem
}
// RESET
static void reset(){
reg.PC = readMem(0xFFFC) | (readMem(0xFFFD) << 8);
reg.SP = 0xFF;
reg.SR |= UNDEFINED;
ope.setAcc = false;
ope.value = 0;
ope.address = 0;
}
// STACK, SIGN AND ZERO FLAGS ROUTINES
// STACK, FLAGS AND RESET ROUTINES
static void push(uint8_t value){
writeMem(0x100 + reg.SP--, value);
@ -104,6 +92,10 @@ static void setSZ(uint8_t value){ // update both the Sign & Zero FLAGS
else reg.SR &= ~SIGN;
}
static void reset(){ // the reset vector is in $FFFC
reg.PC = readMem(0xFFFC) | (readMem(0xFFFD) << 8);
}
// ADDRESSING MODES
@ -437,22 +429,22 @@ static void ROR(){ // ROtate Right
static void ADC(){ // ADd with Carry
uint16_t result = reg.A + ope.value + (reg.SR & CARRY);
setSZ(result);
if (((result)^(reg.A ))&((result)^(ope.value))&0x0080) reg.SR |= OVERFLOW;
if (((result)^(reg.A )) & ((result)^(ope.value)) & 0x80) reg.SR |= OVERFLOW;
else reg.SR &= ~OVERFLOW;
if (reg.SR&DECIMAL) result += ((((result+0x66)^reg.A^ope.value)>>3)&0x22)*3;
if (reg.SR&DECIMAL) result += ((((result+0x66)^reg.A^ope.value)>>3) & 0x22)*3;
if (result & 0xFF00) reg.SR |= CARRY;
else reg.SR &= ~CARRY;
reg.A = (result & 0xFF);
}
static void SBC(){ // SuBtract with Carry
static void SBC(){ // SuBtract with Carry : forum.6502.org/viewtopic.php?t=475
ope.value ^= 0xFF;
if (reg.SR & DECIMAL) ope.value -= 0x0066;
if (reg.SR & DECIMAL) ope.value -= 0x66;
uint16_t result = reg.A + ope.value + (reg.SR & CARRY);
setSZ(result);
if (((result)^(reg.A ))&((result)^(ope.value))&0x0080) reg.SR |= OVERFLOW;
if (((result)^(reg.A )) & ((result)^(ope.value)) & 0x80) reg.SR |= OVERFLOW;
else reg.SR &= ~OVERFLOW;
if (reg.SR&DECIMAL) result += ((((result+0x66)^reg.A^ope.value)>>3)&0x22)*3;
if (reg.SR&DECIMAL) result += ((((result+0x66)^reg.A^ope.value)>>3) & 0x22)*3;
if (result & 0xFF00) reg.SR |= CARRY;
else reg.SR &= ~CARRY;
reg.A = (result & 0xFF);
@ -507,7 +499,7 @@ static void (*addressing[])(void) = {
int main(int argc, char *argv[]) {
static uint16_t offsetsForRows[24] = { // helper for video generation
const uint16_t offsetsForRows[24] = { // helper for video generation
0x400, 0x480, 0x500, 0x580, 0x600, 0x680, 0x700, 0x780,
0x428, 0x4A8, 0x528, 0x5A8, 0x628, 0x6A8, 0x728, 0x7A8,
0x450, 0x4D0, 0x550, 0x5D0, 0x650, 0x6D0, 0x750, 0x7D0
@ -523,7 +515,7 @@ int main(int argc, char *argv[]) {
qiflush();
keypad (stdscr, TRUE);
nodelay (stdscr, TRUE);
scrollok (stdscr, TRUE);
scrollok (stdscr, FALSE);
// load the original Apple][ ROM, including the Programmer's Aid at $D000
FILE *f=fopen("appleII.rom","rb");
@ -542,17 +534,17 @@ int main(int argc, char *argv[]) {
}
// slow down emulation
napms(1);
napms(0.6);
// keyboard controller
if ((ch = getch()) != ERR){
if ((key < 0x80) && ((ch = getch()) != ERR)){
if (ch == KEY_F( 7)) reset(); // F7, processor reset
if (ch == KEY_F(12)) { endwin(); return(0); } // F12, exit program
switch(key=(uint8_t)ch){ // key translations
case 0x0A: key = 0x0D; break; // LF to CR
case 0x04: key = 0x08; break; // LEFT to BS
case 0x05: key = 0x15; break; // RIGHT to NAK
case 0x07: key = 0x08; break; // BELL to BS ?
case 0x07: key = 0x08; break; // BELL to BS (!?)
}
if ((key>0x60) && (key<0x7B)) key&=0xDF; // to upper case
key |= 0x80; // set bit 7
@ -560,22 +552,21 @@ int main(int argc, char *argv[]) {
// video controller - page 1 text mode only
if (videoNeedsRefresh){ // if content changed
move(0, 0);
videoNeedsRefresh = false;
for (int row=0; row<24; row++){ // for each row
move(row,0);
for (int col=0; col<40; col++){ // for each column
glyph = ram[offsetsForRows[row] + col]; // read video memory
if (glyph == '`') glyph = '_'; // change cursor shape
if (glyph < 0x40) attrset(A_REVERSE); // is REVERSE ?
else if (glyph > 0x7F) attrset(A_NORMAL); // is NORMAL ?
else attrset(A_BLINK); // it's FLASHING !
else attrset(A_BLINK); // is FLASHING ?
glyph &= 0x7F; // unset bit 7
if (glyph > 0x5F) glyph &= 0x3F; // shifts to match
if (glyph < 0x20) glyph |= 0x40; // the ASCII codes
addch(glyph); // print the glyph
}
addch(0x0A); // to next row
}
videoNeedsRefresh = false;
}
}
}