Config, CTRL+C, exit

msbasic/defines_kilian.s

@@ -1,13 +1,20 @@
 ; configuration
 CONFIG_2A                     := 1
+
+CONFIG_DATAFLG                := 1
+CONFIG_EASTER_EGG             := 1
+CONFIG_NO_READ_Y_IS_ZERO_HACK := 1
+CONFIG_PEEK_SAVE_LINNUM       := 1
 CONFIG_SCRTCH_ORDER           := 2
 
-; zero page
-ZP_START0           = $00
+; zero page -- CBM BASIC V2 layout
 ZP_START1 = $02
 ZP_START2 = $0C
-ZP_START3           = $62
-ZP_START4           = $6D
+ZP_START3 = $12
+ZP_START4 = $1D
+
+; input buffer
+INPUTBUFFER := $0200
 
 ; extra/override ZP variables
 USR                           := GORESTART ; XXX

msbasic/inline.s

@@ -1,6 +1,6 @@
 .segment "CODE"
 
-.ifndef CONFIG_NO_INPUTBUFFER_ZP
+.ifndef CONFIG_NO_LINE_EDITING
 L2420:
   .ifdef OSI
         jsr     OUTDO

msbasic/kilian_extra.s

@@ -8,13 +8,18 @@ SAVE:
         rts
 
 ISCNTC:
+        lda $BC01
+        cmp #$03
+        beq @break
         rts
+@break:
+        jmp STOP
 
 MONRDKEY:
         lda $BC01
-        bmi MONRDKEY_SKIP_ECHO
+        bmi @skipped
         sta $BC00       ; echo
-MONRDKEY_SKIP_ECHO:
+@skipped:
         rts
 
 MONCOUT:

msbasic/print.s

@@ -93,7 +93,7 @@ LE878:
 
 .ifndef KBD
 L29B9:
-  .ifdef CBM2
+  .ifdef CONFIG_INPUTBUFFER_0200
         lda     #$00
         sta     INPUTBUFFER,x
         ldx     #<(INPUTBUFFER-1)

src/io.c

@@ -1,6 +1,7 @@
 #include "io.h"
 
 #include <stdio.h>
+#include <stdlib.h>
 
 int putChar(uint8_t c) {
   int _c = putchar(c);
@@ -28,5 +29,9 @@ int getChar(void) {
     c = c - 'a' + 'A';
   }
 
+  if (c == 0x07) {
+    exit(EXIT_SUCCESS);
+  }
+
   return c;
 }

src/main.c

@@ -23,7 +23,9 @@ void set_nonblocking_input(void) {
   atexit(restore_terminal);
 
   raw = orig_termios;
-  raw.c_lflag &= ~(ICANON | ECHO); // disable line buffering and echo
+  raw.c_lflag &= ~(ICANON | ECHO); // disable line buffering, echo
+  /* Ctrl+C becomes ordinary input byte 0x03 */
+  raw.c_cc[VINTR] = _POSIX_VDISABLE;
   raw.c_cc[VMIN] = 0; // don't block waiting for input
   raw.c_cc[VTIME] = 0;
   tcsetattr(STDIN_FILENO, TCSANOW, &raw);
@@ -34,6 +36,9 @@ void set_nonblocking_input(void) {
 }
 
 int main(void) {
+  printf("6502PC Emulator with MS Basic\n");
+  printf("CTRL + G to exit\n");
+
   uint8_t *ram = NULL;
   CPU cpu;
 
@@ -43,7 +48,7 @@ int main(void) {
 
   if (createRAM(&ram) != 0) {
     printf("Could not create RAM\n");
-    return 1;
+    exit(EXIT_FAILURE);
   }
 
   /* DEBUG */
@@ -55,14 +60,14 @@ int main(void) {
   /*
   if (!fp) {
     perror("fopen");
-    return 1;
+    exit(EXIT_FAILURE);
   }
 
   fread(ram, 1, RAM_SIZE, fp);
   if (ferror(fp)) {
     perror("fread");
     fclose(fp);
-    return 1;
+    exit(EXIT_FAILURE);
   }
 
   fclose(fp);
@@ -76,8 +81,10 @@ int main(void) {
   while (1) {
     uint8_t sleep = runCycle(&cpu, ram, rom);
     if (sleep == 1) {
-      printf("opcode missing: 0x%X\n", ram[cpu.ProgrammeCounter - 1]);
-      return 1;
+      printf("Illegal opcode $%02X at $%04X "
+             "A=$%02X X=$%02X Y=$%02X SP=$%02X\n",
+             ram[cpu.ProgrammeCounter - 1], cpu.ProgrammeCounter - 1, cpu.Accumulator, cpu.X, cpu.Y, cpu.StackPointer);
+      exit(EXIT_FAILURE);
     }
     sleepTime.tv_sec = 0;
     sleepTime.tv_nsec = sleep * (1000 / MACHINE_SPEED_HZ);