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fast_ram_bye_bye.c

@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <proto/exec.h>
+#include <exec/memory.h>
+
+#define RAM_SIZE (16)
+
+int main(void) {
+  void *FastRAM, *MoreFastRAM;
+  char wow;
+
+  FastRAM = AllocMem(RAM_SIZE, MEMF_FAST);
+
+  // this will happen on a machine that has no fast ram at all installed
+  if (FastRAM == 0) {
+    printf("We couldn't allocate Fast RAM. Does this machine have any?\n");
+    return 1;
+  }
+
+  ((char*)FastRAM)[0]=10;
+
+  printf("Memory location: %d\n", FastRAM);
+  printf("Data at byte 0: %d\n",((char*)FastRAM)[0]);
+  printf("Now, run NoFastMem, then return here and hit Enter\n");
+
+  wow = getc(stdin);
+
+  MoreFastRAM = AllocMem(RAM_SIZE, MEMF_FAST);
+  printf("Attempt to allocate more RAM as Fast RAM: %d\n", MoreFastRAM);
+  if (MoreFastRAM > 0) {
+    printf("We got more RAM, but it's very likely Chip RAM\n");
+    FreeMem(MoreFastRAM, RAM_SIZE);
+  }
+
+  printf("Data still at byte 0: %d\n", ((char*)FastRAM)[0]);
+
+  FreeMem(FastRAM, RAM_SIZE);
+}