From b69ca4488e4479ceaa091d8435b4632d87a89d9e Mon Sep 17 00:00:00 2001
From: Virgil Dupras <hsoft@hardcoded.net>
Date: Thu, 9 Apr 2020 08:26:41 -0400
Subject: [PATCH] Add emul_memdump() and stop automatically on ROM write

---
 emul/emul.c              | 11 +++++++++++
 emul/emul.h              |  1 +
 emul/hw/rc2014/classic.c |  5 +----
 3 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/emul/emul.c b/emul/emul.c
index a636816..75b6b7c 100644
--- a/emul/emul.c
+++ b/emul/emul.c
@@ -41,6 +41,9 @@ static void mem_write(int unused, uint16_t addr, uint8_t val)
 {
     if (addr < m.ramstart) {
         fprintf(stderr, "Writing to ROM (%d)!\n", addr);
+        emul_memdump();
+        fprintf(stderr, "Press any key to continue...\n");
+        while (getchar() > 0x100);
     }
     m.mem[addr] = val;
 }
@@ -102,6 +105,14 @@ void emul_trace(ushort addr)
     }
 }
 
+void emul_memdump()
+{
+    fprintf(stderr, "Dumping memory to memdump. PC %04x\n", m.cpu.PC);
+    FILE *fp = fopen("memdump", "w");
+    fwrite(m.mem, 0x10000, 1, fp);
+    fclose(fp);
+}
+
 void emul_printdebug()
 {
     fprintf(stderr, "Min SP: %04x\n", m.minsp);
diff --git a/emul/emul.h b/emul/emul.h
index 9d848fe..db3a55f 100644
--- a/emul/emul.h
+++ b/emul/emul.h
@@ -31,4 +31,5 @@ bool emul_step();
 bool emul_steps(unsigned int steps);
 void emul_loop();
 void emul_trace(ushort addr);
+void emul_memdump();
 void emul_printdebug();
diff --git a/emul/hw/rc2014/classic.c b/emul/hw/rc2014/classic.c
index 561c259..0c41e4a 100644
--- a/emul/hw/rc2014/classic.c
+++ b/emul/hw/rc2014/classic.c
@@ -102,10 +102,7 @@ int main(int argc, char *argv[])
             char c;
             if (read(fileno(stdin), &c, 1) == 1) {
                 if (c == 5) {
-                    fprintf(stderr, "Dumping memory to memdump\n");
-                    FILE *fp = fopen("memdump", "w");
-                    fwrite(m->mem, 0x10000, 1, fp);
-                    fclose(fp);
+                    emul_memdump();
                     c = 0; // don't send to RC2014
                 }
                 if (c == 4) {   // CTRL+D