diff --git a/include/notcurses/notcurses.h b/include/notcurses/notcurses.h
index 2165767a6..18cca8ef2 100644
--- a/include/notcurses/notcurses.h
+++ b/include/notcurses/notcurses.h
@@ -3403,7 +3403,12 @@ API void ncreader_destroy(struct ncreader* n, char** contents);
 
 // Dump selected Notcurses state to the supplied 'debugfp'. Output is freeform,
 // and subject to change. It includes geometry of all planes, from all piles.
-API void notcurses_debug(struct notcurses* nc, FILE* debugfp)
+API void notcurses_debug(const struct notcurses* nc, FILE* debugfp)
+  __attribute__ ((nonnull (1, 2)));
+
+// Dump selected configuration capabilities to 'debugfp'. Output is freeform,
+// and subject to change.
+API void notcurses_debug_caps(const struct notcurses* nc, FILE* debugfp)
   __attribute__ ((nonnull (1, 2)));
 
 // replaced by ncvisual_media_defblitter(). this original version never returns
diff --git a/src/lib/debug.c b/src/lib/debug.c
index 2384f963e..143798413 100644
--- a/src/lib/debug.c
+++ b/src/lib/debug.c
@@ -1,5 +1,60 @@
 #include "internal.h"
 
+static inline char
+capyn(const char* cap){
+  return cap ? 'y' : 'n';
+}
+
+static inline char
+capbool(bool cap){
+  return cap ? 'y' : 'n';
+}
+
+static void
+tinfo_debug_caps(const tinfo* ti, FILE* debugfp, int rows, int cols,
+                 unsigned images, unsigned videos){
+  const char indent[] = " ";
+  fprintf(debugfp, "%sColors: %u rgb: %c ccc: %c setaf: %c setbf: %c\n",
+          indent, ti->colors, capbool(ti->RGBflag), capbool(ti->CCCflag), capyn(ti->setaf), capyn(ti->setab));
+  fprintf(debugfp, "%ssgr: %c sgr0: %c\n",
+          indent, capyn(ti->sgr), capyn(ti->sgr0));
+  fprintf(debugfp, "%sop: %c fgop: %c bgop: %c\n",
+          indent, capyn(ti->op), capyn(ti->fgop), capyn(ti->bgop));
+  fprintf(debugfp, "%srows: %u cols: %u rpix: %u cpix: %u (%dx%d)\n",
+          indent, rows, cols, ti->cellpixy, ti->cellpixx, rows * ti->cellpixy, cols * ti->cellpixx);
+  if(!ti->pixel_query_done){
+    fprintf(debugfp, "%sno bitmap graphics information yet\n", indent);
+  }else{
+    if(!ti->sixel_supported){
+      fprintf(debugfp, "%sdidn't detect bitmap graphics support\n", indent);
+    }else if(ti->sixel_maxy || ti->color_registers){
+      fprintf(debugfp, "%smax bitmap size: %dx%d colorregs: %u\n",
+              indent, ti->sixel_maxy, ti->sixel_maxx, ti->color_registers);
+    }else{
+      fprintf(debugfp, "%sRGBA pixel graphics supported\n", indent);
+    }
+  }
+  fprintf(debugfp, "%sUTF8: %c sextants: %c braille: %c images: %c videos: %c\n",
+          indent, capbool(ti->utf8), capbool(ti->sextants), capbool(ti->braille),
+          capbool(images), capbool(videos));
+  if(ti->bg_collides_default){
+    fprintf(debugfp, "%sbackground of 0x%06lx is considered transparent\n", indent, ti->bg_collides_default & 0xfffffful);
+  }else{
+    fprintf(debugfp, "%sbackground isn't interpreted as transparent\n", indent);
+  }
+  fprintf(debugfp, "%scup: %c vpa: %c hpa: %c\n",
+          indent, capyn(ti->cup), capyn(ti->vpa), capyn(ti->hpa));
+}
+
+void notcurses_debug_caps(const notcurses* nc, FILE* debugfp){
+  int rows, cols;
+  notcurses_stddim_yx_const(nc, &rows, &cols);
+  bool images, videos;
+  images = notcurses_canopen_images(nc);
+  videos = notcurses_canopen_videos(nc);
+  tinfo_debug_caps(&nc->tcache, debugfp, rows, cols, images, videos);
+}
+
 static void
 ncpile_debug(const ncpile* p, FILE* debugfp){
   fprintf(debugfp, "  ************************* %16p pile ****************************\n", p);
@@ -31,7 +86,7 @@ ncpile_debug(const ncpile* p, FILE* debugfp){
   }
 }
 
-void notcurses_debug(notcurses* nc, FILE* debugfp){
+void notcurses_debug(const notcurses* nc, FILE* debugfp){
   const ncpile* p = ncplane_pile(nc->stdplane);
   fprintf(debugfp, " -------------------------- notcurses debug state -----------------------------\n");
   const ncpile* p0 = p;
diff --git a/src/lib/internal.h b/src/lib/internal.h
index a95e07f11..a90fa2c3b 100644
--- a/src/lib/internal.h
+++ b/src/lib/internal.h
@@ -269,7 +269,6 @@ typedef struct tinfo {
   char* cuf;      // move N cells right
   char* cud;      // move N cells down
   char* cuf1;     // move 1 cell right
-  char* cub1;     // move 1 cell left
   char* home;     // home cursor
   char* civis;    // hide cursor
   char* cnorm;    // restore cursor to default state
@@ -288,8 +287,6 @@ typedef struct tinfo {
   char* initc;    // set a palette entry's RGB value
   char* oc;       // restore original colors
   char* clearscr; // erase screen and home cursor
-  char* cleareol; // clear to end of line
-  char* clearbol; // clear to beginning of line
   char* sc;       // push the cursor location onto the stack
   char* rc;       // pop the cursor location off the stack
   char* smkx;     // enter keypad transmit mode (keypad_xmit)
diff --git a/src/poc/caps-rendered.c b/src/poc/caps-rendered.c
new file mode 100644
index 000000000..239fe5be9
--- /dev/null
+++ b/src/poc/caps-rendered.c
@@ -0,0 +1,15 @@
+#include <stdlib.h>
+#include <notcurses/notcurses.h>
+
+int main(void){
+  notcurses_options nopts = {
+    .flags = NCOPTION_NO_ALTERNATE_SCREEN,
+  };
+  struct notcurses* nc = notcurses_init(&nopts, NULL);
+  if(nc == NULL){
+    return EXIT_FAILURE;
+  }
+  notcurses_check_pixel_support(nc);
+  notcurses_debug_caps(nc, stdout);
+  return notcurses_stop(nc) ? EXIT_FAILURE : EXIT_SUCCESS;
+}