From 8101cc3f62d95f2764d3c84990f8f2c7c7193f89 Mon Sep 17 00:00:00 2001
From: Kilian Hofmann <llego03@yahoo.com>
Date: Sun, 27 Sep 2026 02:19:36 +0200
Subject: [PATCH] Config, CTRL+C, exit

---
 msbasic/defines_kilian.s | 35 +++++++++++++++++++++--------------
 msbasic/inline.s         |  2 +-
 msbasic/kilian_extra.s   |  9 +++++++--
 msbasic/print.s          |  2 +-
 src/io.c                 |  5 +++++
 src/main.c               | 29 ++++++++++++++++++-----------
 6 files changed, 53 insertions(+), 29 deletions(-)

diff --git a/msbasic/defines_kilian.s b/msbasic/defines_kilian.s
index 391d925..09c88b3 100644
--- a/msbasic/defines_kilian.s
+++ b/msbasic/defines_kilian.s
@@ -1,20 +1,27 @@
 ; configuration
-CONFIG_2A           := 1
-CONFIG_SCRTCH_ORDER := 2
+CONFIG_2A                     := 1
 
-; zero page
-ZP_START0           = $00
-ZP_START1           = $02
-ZP_START2           = $0C
-ZP_START3           = $62
-ZP_START4           = $6D
+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 -- CBM BASIC V2 layout
+ZP_START1 = $02
+ZP_START2 = $0C
+ZP_START3 = $12
+ZP_START4 = $1D
+
+; input buffer
+INPUTBUFFER := $0200
 
 ; extra/override ZP variables
-USR                 := GORESTART ; XXX
+USR                           := GORESTART ; XXX
 
 ; constants
-SPACE_FOR_GOSUB     := $3E
-STACK_TOP           := $FA
-WIDTH               := 40
-WIDTH2              := 30
-RAMSTART2           := $0400
+SPACE_FOR_GOSUB               := $3E
+STACK_TOP                     := $FA
+WIDTH                         := 40
+WIDTH2                        := 30
+RAMSTART2                     := $0400
diff --git a/msbasic/inline.s b/msbasic/inline.s
index d28ed79..9d25b37 100644
--- a/msbasic/inline.s
+++ b/msbasic/inline.s
@@ -1,6 +1,6 @@
 .segment "CODE"
 
-.ifndef CONFIG_NO_INPUTBUFFER_ZP
+.ifndef CONFIG_NO_LINE_EDITING
 L2420:
   .ifdef OSI
         jsr     OUTDO
diff --git a/msbasic/kilian_extra.s b/msbasic/kilian_extra.s
index 8f96738..0955a7a 100644
--- a/msbasic/kilian_extra.s
+++ b/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:
diff --git a/msbasic/print.s b/msbasic/print.s
index 6561348..972c9c2 100644
--- a/msbasic/print.s
+++ b/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)
diff --git a/src/io.c b/src/io.c
index e73abbe..5b7d85c 100644
--- a/src/io.c
+++ b/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;
 }
\ No newline at end of file
diff --git a/src/main.c b/src/main.c
index 48ff9b0..08ba508 100644
--- a/src/main.c
+++ b/src/main.c
@@ -23,8 +23,10 @@ void set_nonblocking_input(void) {
   atexit(restore_terminal);
 
   raw = orig_termios;
-  raw.c_lflag &= ~(ICANON | ECHO); // disable line buffering and echo
-  raw.c_cc[VMIN] = 0;              // don't block waiting for input
+  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;
 
@@ -43,26 +48,26 @@ int main(void) {
 
   if (createRAM(&ram) != 0) {
     printf("Could not create RAM\n");
-    return 1;
+    exit(EXIT_FAILURE);
   }
 
   /* DEBUG */
 
-  //FILE *fp = fopen("/Users/Kili2/Documents/Projekte/6502pc/6502_65C02_functional_tests/6502_functional_test.bin", "rb");
-  //FILE *fp = fopen("/Users/Kili2/Documents/Projekte/6502pc/6502_65C02_functional_tests/6502_decimal_test.bin", "rb");
-  //FILE *fp = fopen("/mnt/c/Users/llego/source/repos/6502PC/6502_65C02_functional_tests/6502_functional_test.bin", "rb");
-  //FILE *fp = fopen("/mnt/c/Users/llego/source/repos/6502PC/6502_65C02_functional_tests/6502_decimal_test.bin", "rb");
+  // FILE *fp = fopen("/Users/Kili2/Documents/Projekte/6502pc/6502_65C02_functional_tests/6502_functional_test.bin", "rb");
+  // FILE *fp = fopen("/Users/Kili2/Documents/Projekte/6502pc/6502_65C02_functional_tests/6502_decimal_test.bin", "rb");
+  // FILE *fp = fopen("/mnt/c/Users/llego/source/repos/6502PC/6502_65C02_functional_tests/6502_functional_test.bin", "rb");
+  // FILE *fp = fopen("/mnt/c/Users/llego/source/repos/6502PC/6502_65C02_functional_tests/6502_decimal_test.bin", "rb");
   /*
   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);