Apple-1-Tools/reinette
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the Apple 1 Emulator

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ArthurFerreira2 2019-03-09 18:53:59 +01:00 committed by GitHub
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commit 74302d04de
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1 changed files with 17 additions and 22 deletions
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reinette.c
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@ -1,8 +1,6 @@
// Reinette, emulates the Apple 1 computer
// Copyright 2018 Arthur Ferreira
// Last modified 5th of March 2019
// initially developped on GNU/Linux
// compiles with gcc 6.3.0-18
// Last modified 9th of March 2019
#include <ncurses.h>
#include <unistd.h> // for usleep()
@ -73,11 +71,10 @@ static void reset(){
reg.PC = readMem(0xFFFC) | (readMem(0xFFFD) << 8);
reg.SP = 0xFF;
reg.SR |= UNDEFINED;
key = 0;
keyRdy = 0;
ope.setAcc = false;
ope.value = 0;
ope.address = 0;
keyRdy = 0;
}
@ -485,7 +482,7 @@ static void UND(){ // UNDefined (not a valid or supported 6502 opcode)
}
// JUMP TABLES
// JUMP TABLES
static void (*instruction[])(void) = {
BRK, ORA, UND, UND, UND, ORA, ASL, UND, PHP, ORA, ASL, UND, UND, ORA, ASL, UND,
@ -529,7 +526,7 @@ static void (*addressing[])(void) = {
// PROGRAM ENTRY POINT
int main(int argc, char *argv[]) {
int i = 0, ch = 0;
int i = 0 , ch = 0;
uint8_t opcode = 0;
// ncurses initialization
@ -545,25 +542,23 @@ int main(int argc, char *argv[]) {
// main loop
while(1){
for (i=0; i<100; i++){ // executes 100 instructions before a kbd scan
for (i=0; i<100; i++){ // executes 100 instructions before a kbd scan
opcode = readMem(reg.PC++); // FETCH and increment the Program Counter
addressing[opcode](); // DECODE operands against the addressing mode
instruction[opcode](); // EXEC the instruction
addressing[opcode](); // DECODE operands against the addressing mode
instruction[opcode](); // EXEC the instruction
}
// keyboard controller
if (!keyRdy){ // don't miss a keystroke
ch = getch(); // reads from ncurses
if (ch != ERR){
key = (uint8_t)ch; // getch() returns an int
if (key == 0x12) reset(); // CTRL-R, reset
else if (key == 0x02) BRK(); // CTRL-B, break
else {
if (key == 0x0A) key = 0x0D; // LF (\n) to CR (\r)
if ((key == 0x7F) || (key == 0x08)) key = 0x5F; // DEL and BS to _
if ((key >= 0x61) && (key <= 0x7A)) key &= 0xDF; // to upper case
keyRdy = 0x80;
}
ch = getch(); // non blocking keybd read from ncurses
if (ch != ERR){
key = (uint8_t)ch; // getch() returns an int
if (key == 0x12) reset(); // CTRL-R, reset
else if (key == 0x02) BRK(); // CTRL-B, break
else if (!keyRdy){ // only if not already a key in wait
if (key == 0x0A) key = 0x0D; // LF (\n) to CR (\r)
if ((key == 0x7F) || (key == 0x08)) key = 0x5F; // DEL and BS to _
if ((key >= 0x61) && (key <= 0x7A)) key &= 0xDF; // to upper case
keyRdy = 0x80;
}
}
}