move some things from targettest to samples

samples/apple2/dhgrshow.c

@@ -0,0 +1,46 @@
+// cl65 -t apple2enh --start-addr 0x4000 dhgrshow.c
+
+#include <tgi.h>
+#include <conio.h>
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <peekpoke.h>
+
+void main (void)
+{
+    unsigned old;
+    DIR *dir;
+    struct dirent *ent;
+
+    old = videomode (VIDEOMODE_80x24);
+    tgi_install (a2e_hi_tgi);
+    tgi_init ();
+    POKE (0xC05E, 0);
+
+    dir = opendir (".");
+    while (ent = readdir (dir)) {
+        char *ext;
+        int hgr;
+
+        ext = strrchr (ent->d_name, '.');
+        if (!ext || strcasecmp (ext, ".dhgr"))
+            continue;
+
+        hgr = open (ent->d_name, O_RDONLY);
+        POKE (0xC055, 0);
+        read (hgr, (void*)0x2000, 0x2000);
+        POKE (0xC054, 0);
+        read (hgr, (void*)0x2000, 0x2000);
+        close (hgr);
+
+        if (cgetc () == '\r')
+            break;
+    }
+    closedir (dir);
+
+    POKE (0xC05F, 0);
+    tgi_uninstall ();
+    videomode (old);
+}