diff --git a/backend_mitsud90.c b/backend_mitsud90.c
index b62fda6..e85f834 100644
--- a/backend_mitsud90.c
+++ b/backend_mitsud90.c
@@ -1,7 +1,7 @@
 /*
  *   Mitsubishi CP-D90DW Photo Printer CUPS backend
  *
- *   (c) 2019-2021 Solomon Peachy <pizza@shaftnet.org>
+ *   (c) 2019-2023 Solomon Peachy <pizza@shaftnet.org>
  *
  *   The latest version of this program can be found at:
  *
@@ -190,7 +190,7 @@ struct mitsud90_job_hdr {
 	uint8_t  numcuts; /* # of cuts (0-3) but 0-8 legal */
 /*@0x10*/
 	struct {
-		uint16_t position;  // @ center?
+		uint16_t position;  // BE, @ center
 		uint8_t  margincut; /* 0 for double cut, 1 for single */
 		uint8_t  zeropad;
 	} cutlist[8] __attribute__((packed));  /* 3 is current legal max */
@@ -238,11 +238,11 @@ struct mitsud90_job_footer {
 } __attribute__((packed));
 
 struct mitsud90_memcheck {
-	uint8_t  hdr[4]; /* 1b 47 44 33 */
-	uint8_t  unk[2]; /* 00 33 */
+	uint8_t  hdr[6]; /* 1b 47 44 33 00 33 */
 	uint16_t cols;   /* BE */
 	uint16_t rows;   /* BE */
-	uint8_t  unk_b[4]; /* 64 00 00 01  */
+	uint8_t  waittime; /* 0-100 */
+	uint8_t  unk[3]; /* 00 00 01  */
 	uint8_t  zero_fill[498];
 } __attribute__((packed));
 
@@ -716,6 +716,7 @@ static void mitsud90_cleanup_job(const void *vjob)
 
 /* Sanity check some stuff */
 STATIC_ASSERT(sizeof(struct mitsud90_job_hdr) == 512);
+STATIC_ASSERT(sizeof(struct mitsud90_memcheck) == 512);
 STATIC_ASSERT(sizeof(struct mitsud90_plane_hdr) == 512);
 
 static int mitsud90_main_loop(void *vctx, const void *vjob, int wait_for_return);
@@ -1284,7 +1285,7 @@ top:
 			return 4;
 		}
 		if (mem_resp.size_bad || mem_resp.mem_bad == 0xff) {
-			ERROR("Printer reported bad print params (%02x)\n", mem_resp.size_bad);
+			ERROR("Printer reported bad print params (%02x/%02x)\n", mem_resp.size_bad, mem_resp.mem_bad);
 			return CUPS_BACKEND_CANCEL;
 		}
 		if (mem_resp.mem_bad) {
@@ -1998,7 +1999,7 @@ static const char *mitsud90_prefixes[] = {
 /* Exported */
 const struct dyesub_backend mitsud90_backend = {
 	.name = "Mitsubishi CP-D90/CP-M1",
-	.version = "0.37"  " (lib " LIBMITSU_VER ")",
+	.version = "0.38"  " (lib " LIBMITSU_VER ")",
 	.uri_prefixes = mitsud90_prefixes,
 	.cmdline_arg = mitsud90_cmdline_arg,
 	.cmdline_usage = mitsud90_cmdline,