diff --git a/src/descriptor.c b/src/descriptor.c
index 8e8e95c..f817e14 100644
--- a/src/descriptor.c
+++ b/src/descriptor.c
@@ -164,6 +164,7 @@ static const dc_descriptor_t g_descriptors[] = {
 	{"Oceanic",  "Atom 3.1",            DC_FAMILY_OCEANIC_ATOM2, 0x4456},
 	{"Aeris",    "A300 AI",             DC_FAMILY_OCEANIC_ATOM2, 0x4457},
 	{"Sherwood", "Wisdom 3",            DC_FAMILY_OCEANIC_ATOM2, 0x4458},
+	{"Hollis",   "TX1",                 DC_FAMILY_OCEANIC_ATOM2, 0x4542},
 	{"Sherwood", "Amphos",              DC_FAMILY_OCEANIC_ATOM2, 0x4545},
 	{"Oceanic",  "Pro Plus 3",          DC_FAMILY_OCEANIC_ATOM2, 0x4548},
 	{"Oceanic",  "OCi",                 DC_FAMILY_OCEANIC_ATOM2, 0x454B},
diff --git a/src/oceanic_atom2.c b/src/oceanic_atom2.c
index eb75050..dc0bb7d 100644
--- a/src/oceanic_atom2.c
+++ b/src/oceanic_atom2.c
@@ -134,6 +134,10 @@ static const oceanic_common_version_t oceanic_vt4_version[] = {
 	{"AERISAIR \0\0 1024"},
 };
 
+static const oceanic_common_version_t hollis_tx1_version[] = {
+	{"HOLLDG04 \0\0 2048"},
+};
+
 static const oceanic_common_version_t oceanic_veo1_version[] = {
 	{"OCEVEO10 \0\0   8K"},
 	{"AERIS XR1 NX R\0\0"},
@@ -286,6 +290,19 @@ static const oceanic_common_layout_t oceanic_vt4_layout = {
 	1 /* pt_mode_logbook */
 };
 
+static const oceanic_common_layout_t hollis_tx1_layout = {
+	0x40000, /* memsize */
+	0x0000, /* cf_devinfo */
+	0x0040, /* cf_pointers */
+	0x0780, /* rb_logbook_begin */
+	0x1000, /* rb_logbook_end */
+	8, /* rb_logbook_entry_size */
+	0x1000, /* rb_profile_begin */
+	0x40000, /* rb_profile_end */
+	0, /* pt_mode_global */
+	1 /* pt_mode_logbook */
+};
+
 static const oceanic_common_layout_t oceanic_veo1_layout = {
 	0x0400, /* memsize */
 	0x0000, /* cf_devinfo */
@@ -501,6 +518,8 @@ oceanic_atom2_device_open (dc_device_t **out, dc_context_t *context, const char
 		device->base.layout = &oceanic_atom3_layout;
 	} else if (OCEANIC_COMMON_MATCH (device->base.version, oceanic_vt4_version)) {
 		device->base.layout = &oceanic_vt4_layout;
+	} else if (OCEANIC_COMMON_MATCH (device->base.version, hollis_tx1_version)) {
+		device->base.layout = &hollis_tx1_layout;
 	} else if (OCEANIC_COMMON_MATCH (device->base.version, oceanic_veo1_version)) {
 		device->base.layout = &oceanic_veo1_layout;
 	} else if (OCEANIC_COMMON_MATCH (device->base.version, oceanic_reactpro_version)) {
diff --git a/src/oceanic_atom2_parser.c b/src/oceanic_atom2_parser.c
index 94a20ee..c97e52f 100644
--- a/src/oceanic_atom2_parser.c
+++ b/src/oceanic_atom2_parser.c
@@ -58,6 +58,7 @@
 #define EPICB       0x4453
 #define ATOM31      0x4456
 #define A300AI      0x4457
+#define TX1         0x4542
 #define AMPHOS      0x4545
 #define PROPLUS3    0x4548
 #define OCI         0x454B
@@ -202,6 +203,13 @@ oceanic_atom2_parser_get_datetime (dc_parser_t *abstract, dc_datetime_t *datetim
 			datetime->minute = bcd2dec (p[12]);
 			pm = p[13] & 0x80;
 			break;
+		case TX1:
+			datetime->year   = bcd2dec (p[13]) + 2000;
+			datetime->month  = bcd2dec (p[14]);
+			datetime->day    = bcd2dec (p[15]);
+			datetime->hour   = p[11];
+			datetime->minute = p[10];
+			break;
 		default:
 			datetime->year   = bcd2dec (((p[3] & 0xC0) >> 2) + (p[4] & 0x0F)) + 2000;
 			datetime->month  = (p[4] & 0xF0) >> 4;
@@ -274,6 +282,8 @@ oceanic_atom2_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, uns
 		headersize -= PAGESIZE;
 	} else if (parser->model == VT4 || parser->model == VT41) {
 		headersize += PAGESIZE;
+	} else if (parser->model == TX1) {
+		headersize += 2 * PAGESIZE;
 	} else if (parser->model == ATOM1) {
 		headersize -= 2 * PAGESIZE;
 	} else if (parser->model == F10) {
@@ -327,6 +337,8 @@ oceanic_atom2_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, uns
 				*((unsigned int *) value) = 1;
 			else if (parser->model == VT4 || parser->model == VT41 || parser->model == OCI)
 				*((unsigned int *) value) = 4;
+			else if (parser->model == TX1)
+				*((unsigned int *) value) = 6;
 			else
 				*((unsigned int *) value) = 3;
 			break;
@@ -335,6 +347,9 @@ oceanic_atom2_parser_get_field (dc_parser_t *abstract, dc_field_type_t type, uns
 				oxygen = data[header + 3];
 			} else if (parser->model == OCI) {
 				oxygen = data[0x28 + flags];
+			} else if (parser->model == TX1) {
+				oxygen = data[0x3E + flags];
+				helium = data[0x48 + flags];
 			} else {
 				oxygen = data[header + 4 + flags];
 			}
@@ -369,6 +384,8 @@ oceanic_atom2_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callback_
 		headersize -= PAGESIZE;
 	} else if (parser->model == VT4 || parser->model == VT41) {
 		headersize += PAGESIZE;
+	} else if (parser->model == TX1) {
+		headersize += 2 * PAGESIZE;
 	} else if (parser->model == ATOM1) {
 		headersize -= 2 * PAGESIZE;
 	} else if (parser->model == F10) {
@@ -403,7 +420,8 @@ oceanic_atom2_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callback_
 
 	unsigned int samplesize = PAGESIZE / 2;
 	if (parser->model == OC1A || parser->model == OC1B ||
-		parser->model == OC1C || parser->model == OCI)
+		parser->model == OC1C || parser->model == OCI ||
+		parser->model == TX1)
 		samplesize = PAGESIZE;
 	else if (parser->model == F10)
 		samplesize = 2;
@@ -516,7 +534,7 @@ oceanic_atom2_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callback_
 					parser->model == OC1B || parser->model == OC1C ||
 					parser->model == OCI) {
 					temperature = data[offset + 3];
-				} else if (parser->model == OCS) {
+				} else if (parser->model == OCS || parser->model == TX1) {
 					temperature = data[offset + 1];
 				} else if (parser->model == VT4 || parser->model == VT41 || parser->model == ATOM3 || parser->model == ATOM31 || parser->model == A300AI) {
 					temperature = ((data[offset + 7] & 0xF0) >> 4) | ((data[offset + 7] & 0x0C) << 2) | ((data[offset + 5] & 0x0C) << 4);
@@ -549,6 +567,8 @@ oceanic_atom2_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callback_
 					parser->model == ZENAIR ||parser->model == A300AI ||
 					parser->model == DG03 || parser->model == PROPLUS3)
 					pressure = (((data[offset + 0] & 0x03) << 8) + data[offset + 1]) * 5;
+				else if (parser->model == TX1)
+					pressure = array_uint16_le (data + offset + 4);
 				else
 					pressure -= data[offset + 1];
 				sample.pressure.tank = tank;
diff --git a/src/oceanic_common.c b/src/oceanic_common.c
index f384f4c..f5f37a1 100644
--- a/src/oceanic_common.c
+++ b/src/oceanic_common.c
@@ -65,7 +65,9 @@ get_profile_first (const unsigned char data[], const oceanic_common_layout_t *la
 		return array_uint16_le (data + 16);
 	}
 
-	if (layout->memsize > 0x10000)
+	if (layout->memsize > 0x20000)
+		return (value & 0x3FFF) * PAGESIZE;
+	else if (layout->memsize > 0x10000)
 		return (value & 0x1FFF) * PAGESIZE;
 	else
 		return (value & 0x0FFF) * PAGESIZE;
@@ -85,7 +87,9 @@ get_profile_last (const unsigned char data[], const oceanic_common_layout_t *lay
 		return array_uint16_le(data + 18);
 	}
 
-	if (layout->memsize > 0x10000)
+	if (layout->memsize > 0x20000)
+		return (value & 0x3FFF) * PAGESIZE;
+	else if (layout->memsize > 0x10000)
 		return (value & 0x1FFF) * PAGESIZE;
 	else
 		return (value & 0x0FFF) * PAGESIZE;