diff --git a/embedded_programming/index.html b/embedded_programming/index.html
index 67a573548eb83e07358e2b9ca4821548f5e3407f..b55bc4f84f77bca124393d9171e793068b84393e 100644
--- a/embedded_programming/index.html
+++ b/embedded_programming/index.html
@@ -365,6 +365,7 @@
       <a href=echo.html>bit-bang</a> <a href=hello.ftdi.45.echo.c>echo.c</a> <a href=hello.ftdi.45.echo.make>echo.make</a> <a href=hello.ftdi.45.echo.ino>echo.ino</a> <a href=hello.ftdi.45.echo.serial.ino>echo.serial.ino</a> <a href=hello.ftdi.45.echo.mp4>video</a>
 
 <b><a href=t1614/ATtiny1614-DataSheet-DS40001995B.pdf>ATtiny1614</a> <a href=t1624/ATtiny1624-26-27-DataSheet-DS40002234A.pdf>ATtiny1624</a></b>
+   hello.t1624-XU.0603 <a href=t1624/XU/hello.t1624-XU.0603.kicad_pro>pro</a> <a href=t1624/XU/hello.t1624-XU.0603.kicad_sch>sch</a> <a href=t1624/XU/hello.t1624-XU.0603.kicad_pcb>pcb</a> <a href=t1624/XU/hello.t1624-XU.0603.traces.png>traces</a> <a href=t1624/XU/hello.t1624-XU.0603.interior.png>interior</a> <a href=t1624/XU/hello.t1624-XU.0603.blink.ino>blink.ino</a> <a href=t1624/XU/hello.t1624-XU.0603.jpg>components</a>
    <a href=t1614/hello.t1614.echo>t1614-echo</a> <a href=t1614/hello.t1614.echo.png>board</a> <a href=t1614/hello.t1614.echo.jpg>components</a> <a href=t1614/hello.t1614.echo.traces.png>traces</a> <a href=t1614/hello.t1614.echo.traces_exterior.png>traces+exterior</a> <a href=t1614/hello.t1614.echo.interior.png>interior</a>
       <a href=t1614/hello.t1614.echo.ino>echo.ino</a> <a href=t1614/hello.t1614.echo.mp4>video</a>
 
diff --git a/embedded_programming/t1624/XU/fp-info-cache b/embedded_programming/t1624/XU/fp-info-cache
new file mode 100644
index 0000000000000000000000000000000000000000..573541ac9702dd3969c9bc859d2b91ec1f7e6e56
--- /dev/null
+++ b/embedded_programming/t1624/XU/fp-info-cache
@@ -0,0 +1 @@
+0
diff --git a/embedded_programming/t1624/XU/hello.t1624-XU.0603-backups/hello.t1624-XU.0603-2025-04-07_194425.zip b/embedded_programming/t1624/XU/hello.t1624-XU.0603-backups/hello.t1624-XU.0603-2025-04-07_194425.zip
new file mode 100644
index 0000000000000000000000000000000000000000..999f16db897672292aa6ae8f2eceac74ec457eb6
Binary files /dev/null and b/embedded_programming/t1624/XU/hello.t1624-XU.0603-backups/hello.t1624-XU.0603-2025-04-07_194425.zip differ
diff --git a/embedded_programming/t1624/XU/hello.t1624-XU.0603.blink.ino b/embedded_programming/t1624/XU/hello.t1624-XU.0603.blink.ino
new file mode 100755
index 0000000000000000000000000000000000000000..67c49b7531c9d12011dfd9365532ec19d7c8f564
--- /dev/null
+++ b/embedded_programming/t1624/XU/hello.t1624-XU.0603.blink.ino
@@ -0,0 +1,26 @@
+//
+// hello.t1624-XU.0603.blink.ino
+// 
+// tiny1624 TSSOP 0604 blink hello-world
+//
+// Neil Gershenfeld 4/7/25
+//
+// This work may be reproduced, modified, distributed,
+// performed, and displayed for any purpose, but must
+// acknowledge this project. Copyright is retained and
+// must be preserved. The work is provided as is; no
+// warranty is provided, and users accept all liability.
+//
+
+#define LED PIN_PA4
+
+void setup() {
+  pinMode(LED,OUTPUT);
+  }
+
+void loop() {
+  digitalWrite(LED, LOW);
+  delay(500);
+  digitalWrite(LED, HIGH);
+  delay(150);
+  }
diff --git a/embedded_programming/t1624/XU/hello.t1624-XU.0603.interior.png b/embedded_programming/t1624/XU/hello.t1624-XU.0603.interior.png
new file mode 100644
index 0000000000000000000000000000000000000000..8b919483b3a568ce12e15ec1433730ab063c3b45
Binary files /dev/null and b/embedded_programming/t1624/XU/hello.t1624-XU.0603.interior.png differ
diff --git a/embedded_programming/t1624/XU/hello.t1624-XU.0603.jpg b/embedded_programming/t1624/XU/hello.t1624-XU.0603.jpg
new file mode 100644
index 0000000000000000000000000000000000000000..69588cdb9cfd7f268fef63881057c6e5f1c28fd7
Binary files /dev/null and b/embedded_programming/t1624/XU/hello.t1624-XU.0603.jpg differ
diff --git a/embedded_programming/t1624/XU/hello.t1624-XU.0603.kicad_pcb b/embedded_programming/t1624/XU/hello.t1624-XU.0603.kicad_pcb
new file mode 100644
index 0000000000000000000000000000000000000000..d90895e8be7d3a80247af141adf8499e2ade70ca
--- /dev/null
+++ b/embedded_programming/t1624/XU/hello.t1624-XU.0603.kicad_pcb
@@ -0,0 +1,1708 @@
+(kicad_pcb
+	(version 20241229)
+	(generator "pcbnew")
+	(generator_version "9.0")
+	(general
+		(thickness 1.6)
+		(legacy_teardrops no)
+	)
+	(paper "A4")
+	(layers
+		(0 "F.Cu" signal)
+		(2 "B.Cu" signal)
+		(9 "F.Adhes" user "F.Adhesive")
+		(11 "B.Adhes" user "B.Adhesive")
+		(13 "F.Paste" user)
+		(15 "B.Paste" user)
+		(5 "F.SilkS" user "F.Silkscreen")
+		(7 "B.SilkS" user "B.Silkscreen")
+		(1 "F.Mask" user)
+		(3 "B.Mask" user)
+		(17 "Dwgs.User" user "User.Drawings")
+		(19 "Cmts.User" user "User.Comments")
+		(21 "Eco1.User" user "User.Eco1")
+		(23 "Eco2.User" user "User.Eco2")
+		(25 "Edge.Cuts" user)
+		(27 "Margin" user)
+		(31 "F.CrtYd" user "F.Courtyard")
+		(29 "B.CrtYd" user "B.Courtyard")
+		(35 "F.Fab" user)
+		(33 "B.Fab" user)
+		(39 "User.1" user)
+		(41 "User.2" user)
+		(43 "User.3" user)
+		(45 "User.4" user)
+	)
+	(setup
+		(pad_to_mask_clearance 0)
+		(allow_soldermask_bridges_in_footprints no)
+		(tenting front back)
+		(pcbplotparams
+			(layerselection 0x00000000_00000000_55555555_5755f5ff)
+			(plot_on_all_layers_selection 0x00000000_00000000_00000000_00000000)
+			(disableapertmacros no)
+			(usegerberextensions no)
+			(usegerberattributes yes)
+			(usegerberadvancedattributes yes)
+			(creategerberjobfile yes)
+			(dashed_line_dash_ratio 12.000000)
+			(dashed_line_gap_ratio 3.000000)
+			(svgprecision 4)
+			(plotframeref no)
+			(mode 1)
+			(useauxorigin no)
+			(hpglpennumber 1)
+			(hpglpenspeed 20)
+			(hpglpendiameter 15.000000)
+			(pdf_front_fp_property_popups yes)
+			(pdf_back_fp_property_popups yes)
+			(pdf_metadata yes)
+			(pdf_single_document no)
+			(dxfpolygonmode yes)
+			(dxfimperialunits yes)
+			(dxfusepcbnewfont yes)
+			(psnegative no)
+			(psa4output no)
+			(plot_black_and_white yes)
+			(sketchpadsonfab no)
+			(plotpadnumbers no)
+			(hidednponfab no)
+			(sketchdnponfab yes)
+			(crossoutdnponfab yes)
+			(subtractmaskfromsilk no)
+			(outputformat 1)
+			(mirror no)
+			(drillshape 1)
+			(scaleselection 1)
+			(outputdirectory "")
+		)
+	)
+	(net 0 "")
+	(net 1 "unconnected-(IC1-PA6-Pad4)")
+	(net 2 "unconnected-(IC1-PA2-Pad12)")
+	(net 3 "unconnected-(IC1-(TOSC2)_PB2-Pad7)")
+	(net 4 "unconnected-(IC1-PA3_(EXTCLK)-Pad13)")
+	(net 5 "unconnected-(IC1-PA5-Pad3)")
+	(net 6 "unconnected-(IC1-(TOSC1)_PB3-Pad6)")
+	(net 7 "unconnected-(IC1-PB1-Pad8)")
+	(net 8 "unconnected-(IC1-PA1-Pad11)")
+	(net 9 "unconnected-(IC1-PB0-Pad9)")
+	(net 10 "unconnected-(IC1-PA7-Pad5)")
+	(net 11 "GND")
+	(net 12 "V")
+	(net 13 "UPDI")
+	(net 14 "Net-(LED1-Pad1)")
+	(net 15 "Net-(IC1-PA4)")
+	(footprint "fab:PinHeader_01x03_P2.54mm_Horizontal_SMD"
+		(layer "F.Cu")
+		(uuid "7b631357-6341-4634-ab94-736be10a8d07")
+		(at 98.05 93.7 -90)
+		(descr "https://s3.amazonaws.com/catalogspreads-pdf/PAGE112-113%20.100%20MALE%20HDR.pdf")
+		(tags "horizontal pin header SMD 2.54mm")
+		(property "Reference" "J1"
+			(at -1.524 -2.54 90)
+			(layer "F.SilkS")
+			(hide yes)
+			(uuid "abe33164-80ee-475d-aa87-e8b9c9a00b1e")
+			(effects
+				(font
+					(size 1 1)
+					(thickness 0.15)
+				)
+				(justify left)
+			)
+		)
+		(property "Value" "V G UPDI"
+			(at 2.6 8.3 90)
+			(layer "F.Fab")
+			(hide yes)
+			(uuid "0b16f179-d1a0-40d8-bd02-6b494bdda53c")
+			(effects
+				(font
+					(size 1 1)
+					(thickness 0.15)
+				)
+			)
+		)
+		(property "Datasheet" ""
+			(at 0 0 90)
+			(layer "F.Fab")
+			(hide yes)
+			(uuid "87da0bd1-3c92-443b-aa68-5865bda48efd")
+			(effects
+				(font
+					(size 1.27 1.27)
+					(thickness 0.15)
+				)
+			)
+		)
+		(property "Description" "Male connector, single row"
+			(at 0 0 90)
+			(layer "F.Fab")
+			(hide yes)
+			(uuid "9c506872-b64e-4f69-8e22-501f650f104c")
+			(effects
+				(font
+					(size 1.27 1.27)
+					(thickness 0.15)
+				)
+			)
+		)
+		(property ki_fp_filters "*PinHeader*1x03*")
+		(path "/b287f5e8-1c20-4be0-a3e8-ab932c372b9c")
+		(sheetname "/")
+		(sheetfile "hello.t1624-XU.0603.kicad_sch")
+		(attr smd)
+		(fp_line
+			(start 3.81 6.35)
+			(end 3.81 -1.27)
+			(stroke
+				(width 0.12)
+				(type solid)
+			)
+			(layer "F.SilkS")
+			(uuid "c8ca9e1f-6400-4320-ba2c-ee6ce5ca98ad")
+		)
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+			(start 6.35 6.35)
+			(end 3.81 6.35)
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+			)
+			(layer "F.SilkS")
+			(uuid "59dd12ea-235e-409d-9133-97d08340bdf5")
+		)
+		(fp_line
+			(start 3.81 5.334)
+			(end 1.5 5.334)
+			(stroke
+				(width 0.12)
+				(type solid)
+			)
+			(layer "F.SilkS")
+			(uuid "601d28e6-6125-48e6-b7bc-b61a77fd9601")
+		)
+		(fp_line
+			(start 3.81 4.826)
+			(end 1.5 4.826)
+			(stroke
+				(width 0.12)
+				(type solid)
+			)
+			(layer "F.SilkS")
+			(uuid "74f4d7b0-6636-4e25-a700-f0849fb27b2e")
+		)
+		(fp_line
+			(start 3.81 2.794)
+			(end 1.5 2.794)
+			(stroke
+				(width 0.12)
+				(type solid)
+			)
+			(layer "F.SilkS")
+			(uuid "15a95ec9-8afa-4bc7-a4a3-6d32672d336a")
+		)
+		(fp_line
+			(start 3.81 2.286)
+			(end 1.5 2.286)
+			(stroke
+				(width 0.12)
+				(type solid)
+			)
+			(layer "F.SilkS")
+			(uuid "63e762fe-3dd1-4e93-a36a-5813e2191dca")
+		)
+		(fp_line
+			(start 3.81 0.254)
+			(end 1.5 0.254)
+			(stroke
+				(width 0.12)
+				(type solid)
+			)
+			(layer "F.SilkS")
+			(uuid "5ce8b1be-f830-4653-bbeb-7b003460258b")
+		)
+		(fp_line
+			(start 3.81 -0.254)
+			(end 1.5 -0.254)
+			(stroke
+				(width 0.12)
+				(type solid)
+			)
+			(layer "F.SilkS")
+			(uuid "5f9334df-fc52-4176-a7c0-3397973030b1")
+		)
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+			(start -1.27 -1.27)
+			(end 0 -1.27)
+			(stroke
+				(width 0.12)
+				(type solid)
+			)
+			(layer "F.SilkS")
+			(uuid "b4305fab-9686-4109-8a7e-a92b0795f112")
+		)
+		(fp_line
+			(start 3.81 -1.27)
+			(end 6.35 -1.27)
+			(stroke
+				(width 0.12)
+				(type solid)
+			)
+			(layer "F.SilkS")
+			(uuid "fc7dfa3d-4fdd-4e40-bc38-2d1396d52b34")
+		)
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+			(start 6.35 -1.27)
+			(end 6.35 6.35)
+			(stroke
+				(width 0.12)
+				(type solid)
+			)
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+			(uuid "b6a1180e-3d5e-4b57-a0ab-50484c22464b")
+		)
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+			(start -1.8 6.9)
+			(end 6.4 6.9)
+			(stroke
+				(width 0.05)
+				(type solid)
+			)
+			(layer "F.CrtYd")
+			(uuid "643ea87e-5e57-4215-9f08-0f53e191068d")
+		)
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+			(start 6.4 6.9)
+			(end 6.4 -1.8)
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+				(width 0.05)
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+			)
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+		)
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+			(start -1.8 -1.8)
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+			(uuid "bcc8835f-b79a-4023-9130-b780eb3f95ca")
+		)
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+			(layer "F.CrtYd")
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+		)
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+			)
+			(layer "F.Fab")
+			(uuid "e9950451-59f0-4744-8c17-9c7a179f97f1")
+		)
+		(fp_line
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+			)
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+			(uuid "9d167512-e457-4861-a143-0b960d836bd2")
+		)
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+			(start 3.81 5.08)
+			(end -0.635 5.08)
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+				(type solid)
+			)
+			(layer "F.Fab")
+			(uuid "6f86560f-5839-4529-a3f1-b029ec529142")
+		)
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+			(start -0.635 4.826)
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+			(layer "F.Fab")
+			(uuid "2b8ca910-bb84-402a-b222-a74e38e20360")
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+			(start 3.81 2.54)
+			(end -0.635 2.54)
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+			)
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+			(uuid "737ea73a-6f1d-4e30-9327-fb0ed0a1441b")
+		)
+		(fp_line
+			(start -0.635 2.286)
+			(end -0.635 2.794)
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+				(width 0.1)
+				(type solid)
+			)
+			(layer "F.Fab")
+			(uuid "09aa2d5a-1974-418f-96d7-af908d9f54b6")
+		)
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+			(start 3.81 0)
+			(end -0.635 0)
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+			)
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+		)
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+			(start -0.635 -0.254)
+			(end -0.635 0.254)
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+				(type solid)
+			)
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+			(uuid "24196dc4-f6ea-4b2a-bb9e-66087e50b303")
+		)
+		(fp_line
+			(start 3.8 -1.27)
+			(end 6.34 -1.27)
+			(stroke
+				(width 0.1)
+				(type solid)
+			)
+			(layer "F.Fab")
+			(uuid "7d40f3db-6551-430c-8176-e4c97d9a3173")
+		)
+		(fp_line
+			(start 6.34 -1.27)
+			(end 6.35 6.35)
+			(stroke
+				(width 0.1)
+				(type solid)
+			)
+			(layer "F.Fab")
+			(uuid "d1a2393d-3185-4087-9921-0ced15f543f4")
+		)
+		(fp_text user "${REFERENCE}"
+			(at 2.4 2.6 0)
+			(layer "F.Fab")
+			(uuid "51bd5724-452b-4382-b4f0-9e9250e2b3f7")
+			(effects
+				(font
+					(size 1 1)
+					(thickness 0.15)
+				)
+			)
+		)
+		(pad "1" smd rect
+			(at 0 0 270)
+			(size 2.5 1.7)
+			(layers "F.Cu" "F.Mask" "F.Paste")
+			(net 13 "UPDI")
+			(pinfunction "Pin_1")
+			(pintype "passive")
+			(uuid "43556c13-6838-48a7-8323-5247be7c7954")
+		)
+		(pad "2" smd rect
+			(at 0 2.54 270)
+			(size 2.5 1.7)
+			(layers "F.Cu" "F.Mask" "F.Paste")
+			(net 11 "GND")
+			(pinfunction "Pin_2")
+			(pintype "passive")
+			(uuid "52737fcd-769f-46e8-aa99-e67c777cce8b")
+		)
+		(pad "3" smd rect
+			(at 0 5.08 270)
+			(size 2.5 1.7)
+			(layers "F.Cu" "F.Mask" "F.Paste")
+			(net 12 "V")
+			(pinfunction "Pin_3")
+			(pintype "passive")
+			(uuid "9df093b8-8012-4005-b8c2-768fcd63b072")
+		)
+		(embedded_fonts no)
+		(model "$(FAB)/fab.3dshapes/Header_SMD_01x03_P2.54mm_Horizontal_Male.step"
+			(offset
+				(xyz 0 0 0)
+			)
+			(scale
+				(xyz 1 1 1)
+			)
+			(rotate
+				(xyz 0 0 0)
+			)
+		)
+	)
+	(footprint "Neil:LED 0603"
+		(layer "F.Cu")
+		(uuid "ae40a69a-e109-43fe-91e0-265a4dd89310")
+		(at 93.5 84.5 180)
+		(tags "B1911USD-20D000114U1930 ")
+		(property "Reference" "LED1"
+			(at -0.2413 1.5 0)
+			(unlocked yes)
+			(layer "F.SilkS")
+			(hide yes)
+			(uuid "f23ef140-0c49-4a69-8a72-e50ea9a2bf3d")
+			(effects
+				(font
+					(size 1 1)
+					(thickness 0.15)
+				)
+			)
+		)
+		(property "Value" "~"
+			(at 0 0 180)
+			(unlocked yes)
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diff --git a/embedded_programming/t1624/XU/hello.t1624-XU.0603.kicad_prl b/embedded_programming/t1624/XU/hello.t1624-XU.0603.kicad_prl
new file mode 100644
index 0000000000000000000000000000000000000000..a807afad58a2bda9fa0de2d235727001a5a760c6
--- /dev/null
+++ b/embedded_programming/t1624/XU/hello.t1624-XU.0603.kicad_prl
@@ -0,0 +1,130 @@
+{
+  "board": {
+    "active_layer": 0,
+    "active_layer_preset": "All Layers",
+    "auto_track_width": true,
+    "hidden_netclasses": [],
+    "hidden_nets": [],
+    "high_contrast_mode": 0,
+    "net_color_mode": 1,
+    "opacity": {
+      "images": 0.6,
+      "pads": 1.0,
+      "shapes": 1.0,
+      "tracks": 1.0,
+      "vias": 1.0,
+      "zones": 0.6
+    },
+    "selection_filter": {
+      "dimensions": true,
+      "footprints": true,
+      "graphics": true,
+      "keepouts": true,
+      "lockedItems": false,
+      "otherItems": true,
+      "pads": true,
+      "text": true,
+      "tracks": true,
+      "vias": true,
+      "zones": true
+    },
+    "visible_items": [
+      "vias",
+      "footprint_text",
+      "footprint_anchors",
+      "ratsnest",
+      "grid",
+      "footprints_front",
+      "footprints_back",
+      "footprint_values",
+      "footprint_references",
+      "tracks",
+      "drc_errors",
+      "drawing_sheet",
+      "bitmaps",
+      "pads",
+      "zones",
+      "drc_warnings",
+      "locked_item_shadows",
+      "conflict_shadows",
+      "shapes"
+    ],
+    "visible_layers": "ffffffff_ffffffff_ffffffff_ffffffff",
+    "zone_display_mode": 0
+  },
+  "git": {
+    "repo_type": "",
+    "repo_username": "",
+    "ssh_key": ""
+  },
+  "meta": {
+    "filename": "hello.t1624-XU.0603.kicad_prl",
+    "version": 5
+  },
+  "net_inspector_panel": {
+    "col_hidden": [
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false
+    ],
+    "col_order": [
+      0,
+      1,
+      2,
+      3,
+      4,
+      5,
+      6,
+      7,
+      8,
+      9
+    ],
+    "col_widths": [
+      0,
+      0,
+      0,
+      0,
+      0,
+      0,
+      0,
+      0,
+      0,
+      0
+    ],
+    "custom_group_rules": [],
+    "expanded_rows": [],
+    "filter_by_net_name": true,
+    "filter_by_netclass": true,
+    "filter_text": "",
+    "group_by_constraint": false,
+    "group_by_netclass": false,
+    "show_unconnected_nets": false,
+    "show_zero_pad_nets": false,
+    "sort_ascending": true,
+    "sorting_column": 0
+  },
+  "open_jobsets": [],
+  "project": {
+    "files": []
+  },
+  "schematic": {
+    "selection_filter": {
+      "graphics": true,
+      "images": true,
+      "labels": true,
+      "lockedItems": false,
+      "otherItems": true,
+      "pins": true,
+      "symbols": true,
+      "text": true,
+      "wires": true
+    }
+  }
+}
diff --git a/embedded_programming/t1624/XU/hello.t1624-XU.0603.kicad_pro b/embedded_programming/t1624/XU/hello.t1624-XU.0603.kicad_pro
new file mode 100644
index 0000000000000000000000000000000000000000..9fc438041e7bda74ed5ff984b9cb42c01a49738d
--- /dev/null
+++ b/embedded_programming/t1624/XU/hello.t1624-XU.0603.kicad_pro
@@ -0,0 +1,618 @@
+{
+  "board": {
+    "3dviewports": [],
+    "design_settings": {
+      "defaults": {
+        "apply_defaults_to_fp_fields": false,
+        "apply_defaults_to_fp_shapes": false,
+        "apply_defaults_to_fp_text": false,
+        "board_outline_line_width": 0.05,
+        "copper_line_width": 0.2,
+        "copper_text_italic": false,
+        "copper_text_size_h": 1.5,
+        "copper_text_size_v": 1.5,
+        "copper_text_thickness": 0.3,
+        "copper_text_upright": false,
+        "courtyard_line_width": 0.05,
+        "dimension_precision": 4,
+        "dimension_units": 3,
+        "dimensions": {
+          "arrow_length": 1270000,
+          "extension_offset": 500000,
+          "keep_text_aligned": true,
+          "suppress_zeroes": true,
+          "text_position": 0,
+          "units_format": 0
+        },
+        "fab_line_width": 0.1,
+        "fab_text_italic": false,
+        "fab_text_size_h": 1.0,
+        "fab_text_size_v": 1.0,
+        "fab_text_thickness": 0.15,
+        "fab_text_upright": false,
+        "other_line_width": 0.1,
+        "other_text_italic": false,
+        "other_text_size_h": 1.0,
+        "other_text_size_v": 1.0,
+        "other_text_thickness": 0.15,
+        "other_text_upright": false,
+        "pads": {
+          "drill": 0.8,
+          "height": 1.27,
+          "width": 2.54
+        },
+        "silk_line_width": 0.1,
+        "silk_text_italic": false,
+        "silk_text_size_h": 1.0,
+        "silk_text_size_v": 1.0,
+        "silk_text_thickness": 0.1,
+        "silk_text_upright": false,
+        "zones": {
+          "min_clearance": 0.5
+        }
+      },
+      "diff_pair_dimensions": [],
+      "drc_exclusions": [],
+      "meta": {
+        "version": 2
+      },
+      "rule_severities": {
+        "annular_width": "error",
+        "clearance": "error",
+        "connection_width": "warning",
+        "copper_edge_clearance": "error",
+        "copper_sliver": "warning",
+        "courtyards_overlap": "error",
+        "creepage": "error",
+        "diff_pair_gap_out_of_range": "error",
+        "diff_pair_uncoupled_length_too_long": "error",
+        "drill_out_of_range": "error",
+        "duplicate_footprints": "warning",
+        "extra_footprint": "warning",
+        "footprint": "error",
+        "footprint_filters_mismatch": "ignore",
+        "footprint_symbol_mismatch": "warning",
+        "footprint_type_mismatch": "ignore",
+        "hole_clearance": "error",
+        "hole_to_hole": "warning",
+        "holes_co_located": "warning",
+        "invalid_outline": "error",
+        "isolated_copper": "warning",
+        "item_on_disabled_layer": "error",
+        "items_not_allowed": "error",
+        "length_out_of_range": "error",
+        "lib_footprint_issues": "warning",
+        "lib_footprint_mismatch": "warning",
+        "malformed_courtyard": "error",
+        "microvia_drill_out_of_range": "error",
+        "mirrored_text_on_front_layer": "warning",
+        "missing_courtyard": "ignore",
+        "missing_footprint": "warning",
+        "net_conflict": "warning",
+        "nonmirrored_text_on_back_layer": "warning",
+        "npth_inside_courtyard": "ignore",
+        "padstack": "warning",
+        "pth_inside_courtyard": "ignore",
+        "shorting_items": "error",
+        "silk_edge_clearance": "warning",
+        "silk_over_copper": "warning",
+        "silk_overlap": "warning",
+        "skew_out_of_range": "error",
+        "solder_mask_bridge": "error",
+        "starved_thermal": "error",
+        "text_height": "warning",
+        "text_on_edge_cuts": "error",
+        "text_thickness": "warning",
+        "through_hole_pad_without_hole": "error",
+        "too_many_vias": "error",
+        "track_angle": "error",
+        "track_dangling": "warning",
+        "track_segment_length": "error",
+        "track_width": "error",
+        "tracks_crossing": "error",
+        "unconnected_items": "error",
+        "unresolved_variable": "error",
+        "via_dangling": "warning",
+        "zones_intersect": "error"
+      },
+      "rules": {
+        "max_error": 0.005,
+        "min_clearance": 0.0,
+        "min_connection": 0.0,
+        "min_copper_edge_clearance": 0.5,
+        "min_groove_width": 0.0,
+        "min_hole_clearance": 0.25,
+        "min_hole_to_hole": 0.25,
+        "min_microvia_diameter": 0.2,
+        "min_microvia_drill": 0.1,
+        "min_resolved_spokes": 2,
+        "min_silk_clearance": 0.0,
+        "min_text_height": 0.8,
+        "min_text_thickness": 0.08,
+        "min_through_hole_diameter": 0.3,
+        "min_track_width": 0.0,
+        "min_via_annular_width": 0.1,
+        "min_via_diameter": 0.5,
+        "solder_mask_to_copper_clearance": 0.0,
+        "use_height_for_length_calcs": true
+      },
+      "teardrop_options": [
+        {
+          "td_onpthpad": true,
+          "td_onroundshapesonly": false,
+          "td_onsmdpad": true,
+          "td_ontrackend": false,
+          "td_onvia": true
+        }
+      ],
+      "teardrop_parameters": [
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_round_shape",
+          "td_width_to_size_filter_ratio": 0.9
+        },
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_rect_shape",
+          "td_width_to_size_filter_ratio": 0.9
+        },
+        {
+          "td_allow_use_two_tracks": true,
+          "td_curve_segcount": 0,
+          "td_height_ratio": 1.0,
+          "td_length_ratio": 0.5,
+          "td_maxheight": 2.0,
+          "td_maxlen": 1.0,
+          "td_on_pad_in_zone": false,
+          "td_target_name": "td_track_end",
+          "td_width_to_size_filter_ratio": 0.9
+        }
+      ],
+      "track_widths": [],
+      "tuning_pattern_settings": {
+        "diff_pair_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 1.0
+        },
+        "diff_pair_skew_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 0.6
+        },
+        "single_track_defaults": {
+          "corner_radius_percentage": 80,
+          "corner_style": 1,
+          "max_amplitude": 1.0,
+          "min_amplitude": 0.2,
+          "single_sided": false,
+          "spacing": 0.6
+        }
+      },
+      "via_dimensions": [],
+      "zones_allow_external_fillets": false
+    },
+    "ipc2581": {
+      "dist": "",
+      "distpn": "",
+      "internal_id": "",
+      "mfg": "",
+      "mpn": ""
+    },
+    "layer_pairs": [],
+    "layer_presets": [],
+    "viewports": []
+  },
+  "boards": [],
+  "cvpcb": {
+    "equivalence_files": []
+  },
+  "erc": {
+    "erc_exclusions": [],
+    "meta": {
+      "version": 0
+    },
+    "pin_map": [
+      [
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        1,
+        0,
+        0,
+        0,
+        0,
+        2
+      ],
+      [
+        0,
+        2,
+        0,
+        1,
+        0,
+        0,
+        1,
+        0,
+        2,
+        2,
+        2,
+        2
+      ],
+      [
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        1,
+        0,
+        1,
+        0,
+        1,
+        2
+      ],
+      [
+        0,
+        1,
+        0,
+        0,
+        0,
+        0,
+        1,
+        1,
+        2,
+        1,
+        1,
+        2
+      ],
+      [
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        1,
+        0,
+        0,
+        0,
+        0,
+        2
+      ],
+      [
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        0,
+        2
+      ],
+      [
+        1,
+        1,
+        1,
+        1,
+        1,
+        0,
+        1,
+        1,
+        1,
+        1,
+        1,
+        2
+      ],
+      [
+        0,
+        0,
+        0,
+        1,
+        0,
+        0,
+        1,
+        0,
+        0,
+        0,
+        0,
+        2
+      ],
+      [
+        0,
+        2,
+        1,
+        2,
+        0,
+        0,
+        1,
+        0,
+        2,
+        2,
+        2,
+        2
+      ],
+      [
+        0,
+        2,
+        0,
+        1,
+        0,
+        0,
+        1,
+        0,
+        2,
+        0,
+        0,
+        2
+      ],
+      [
+        0,
+        2,
+        1,
+        1,
+        0,
+        0,
+        1,
+        0,
+        2,
+        0,
+        0,
+        2
+      ],
+      [
+        2,
+        2,
+        2,
+        2,
+        2,
+        2,
+        2,
+        2,
+        2,
+        2,
+        2,
+        2
+      ]
+    ],
+    "rule_severities": {
+      "bus_definition_conflict": "error",
+      "bus_entry_needed": "error",
+      "bus_to_bus_conflict": "error",
+      "bus_to_net_conflict": "error",
+      "different_unit_footprint": "error",
+      "different_unit_net": "error",
+      "duplicate_reference": "error",
+      "duplicate_sheet_names": "error",
+      "endpoint_off_grid": "warning",
+      "extra_units": "error",
+      "footprint_filter": "ignore",
+      "footprint_link_issues": "warning",
+      "four_way_junction": "ignore",
+      "global_label_dangling": "warning",
+      "hier_label_mismatch": "error",
+      "label_dangling": "error",
+      "label_multiple_wires": "warning",
+      "lib_symbol_issues": "warning",
+      "lib_symbol_mismatch": "warning",
+      "missing_bidi_pin": "warning",
+      "missing_input_pin": "warning",
+      "missing_power_pin": "error",
+      "missing_unit": "warning",
+      "multiple_net_names": "warning",
+      "net_not_bus_member": "warning",
+      "no_connect_connected": "warning",
+      "no_connect_dangling": "warning",
+      "pin_not_connected": "error",
+      "pin_not_driven": "error",
+      "pin_to_pin": "warning",
+      "power_pin_not_driven": "error",
+      "same_local_global_label": "warning",
+      "similar_label_and_power": "warning",
+      "similar_labels": "warning",
+      "similar_power": "warning",
+      "simulation_model_issue": "ignore",
+      "single_global_label": "ignore",
+      "unannotated": "error",
+      "unconnected_wire_endpoint": "warning",
+      "unit_value_mismatch": "error",
+      "unresolved_variable": "error",
+      "wire_dangling": "error"
+    }
+  },
+  "libraries": {
+    "pinned_footprint_libs": [],
+    "pinned_symbol_libs": []
+  },
+  "meta": {
+    "filename": "hello.t1624-XU.0603.kicad_pro",
+    "version": 3
+  },
+  "net_settings": {
+    "classes": [
+      {
+        "bus_width": 12,
+        "clearance": 0.2,
+        "diff_pair_gap": 0.25,
+        "diff_pair_via_gap": 0.25,
+        "diff_pair_width": 0.2,
+        "line_style": 0,
+        "microvia_diameter": 0.3,
+        "microvia_drill": 0.1,
+        "name": "Default",
+        "pcb_color": "rgba(0, 0, 0, 0.000)",
+        "priority": 2147483647,
+        "schematic_color": "rgba(0, 0, 0, 0.000)",
+        "track_width": 0.2,
+        "via_diameter": 0.6,
+        "via_drill": 0.3,
+        "wire_width": 6
+      }
+    ],
+    "meta": {
+      "version": 4
+    },
+    "net_colors": null,
+    "netclass_assignments": null,
+    "netclass_patterns": []
+  },
+  "pcbnew": {
+    "last_paths": {
+      "gencad": "",
+      "idf": "",
+      "netlist": "",
+      "plot": "",
+      "pos_files": "",
+      "specctra_dsn": "",
+      "step": "",
+      "svg": "",
+      "vrml": ""
+    },
+    "page_layout_descr_file": ""
+  },
+  "schematic": {
+    "annotate_start_num": 0,
+    "bom_export_filename": "${PROJECTNAME}.csv",
+    "bom_fmt_presets": [],
+    "bom_fmt_settings": {
+      "field_delimiter": ",",
+      "keep_line_breaks": false,
+      "keep_tabs": false,
+      "name": "CSV",
+      "ref_delimiter": ",",
+      "ref_range_delimiter": "",
+      "string_delimiter": "\""
+    },
+    "bom_presets": [],
+    "bom_settings": {
+      "exclude_dnp": false,
+      "fields_ordered": [
+        {
+          "group_by": false,
+          "label": "Reference",
+          "name": "Reference",
+          "show": true
+        },
+        {
+          "group_by": false,
+          "label": "Qty",
+          "name": "${QUANTITY}",
+          "show": true
+        },
+        {
+          "group_by": true,
+          "label": "Value",
+          "name": "Value",
+          "show": true
+        },
+        {
+          "group_by": true,
+          "label": "DNP",
+          "name": "${DNP}",
+          "show": true
+        },
+        {
+          "group_by": true,
+          "label": "Exclude from BOM",
+          "name": "${EXCLUDE_FROM_BOM}",
+          "show": true
+        },
+        {
+          "group_by": true,
+          "label": "Exclude from Board",
+          "name": "${EXCLUDE_FROM_BOARD}",
+          "show": true
+        },
+        {
+          "group_by": true,
+          "label": "Footprint",
+          "name": "Footprint",
+          "show": true
+        },
+        {
+          "group_by": false,
+          "label": "Datasheet",
+          "name": "Datasheet",
+          "show": true
+        }
+      ],
+      "filter_string": "",
+      "group_symbols": true,
+      "include_excluded_from_bom": true,
+      "name": "Default Editing",
+      "sort_asc": true,
+      "sort_field": "Reference"
+    },
+    "connection_grid_size": 50.0,
+    "drawing": {
+      "dashed_lines_dash_length_ratio": 12.0,
+      "dashed_lines_gap_length_ratio": 3.0,
+      "default_line_thickness": 6.0,
+      "default_text_size": 50.0,
+      "field_names": [],
+      "intersheets_ref_own_page": false,
+      "intersheets_ref_prefix": "",
+      "intersheets_ref_short": false,
+      "intersheets_ref_show": false,
+      "intersheets_ref_suffix": "",
+      "junction_size_choice": 3,
+      "label_size_ratio": 0.375,
+      "operating_point_overlay_i_precision": 3,
+      "operating_point_overlay_i_range": "~A",
+      "operating_point_overlay_v_precision": 3,
+      "operating_point_overlay_v_range": "~V",
+      "overbar_offset_ratio": 1.23,
+      "pin_symbol_size": 25.0,
+      "text_offset_ratio": 0.15
+    },
+    "legacy_lib_dir": "",
+    "legacy_lib_list": [],
+    "meta": {
+      "version": 1
+    },
+    "net_format_name": "",
+    "page_layout_descr_file": "",
+    "plot_directory": "",
+    "space_save_all_events": true,
+    "spice_current_sheet_as_root": false,
+    "spice_external_command": "spice \"%I\"",
+    "spice_model_current_sheet_as_root": true,
+    "spice_save_all_currents": false,
+    "spice_save_all_dissipations": false,
+    "spice_save_all_voltages": false,
+    "subpart_first_id": 65,
+    "subpart_id_separator": 0
+  },
+  "sheets": [
+    [
+      "f44d457e-7bd0-4123-a6f8-dee643813f47",
+      "Root"
+    ]
+  ],
+  "text_variables": {}
+}
diff --git a/embedded_programming/t1624/XU/hello.t1624-XU.0603.kicad_sch b/embedded_programming/t1624/XU/hello.t1624-XU.0603.kicad_sch
new file mode 100644
index 0000000000000000000000000000000000000000..35b54c018f406623fef52522117c713cd175acd8
--- /dev/null
+++ b/embedded_programming/t1624/XU/hello.t1624-XU.0603.kicad_sch
@@ -0,0 +1,1976 @@
+(kicad_sch
+	(version 20250114)
+	(generator "eeschema")
+	(generator_version "9.0")
+	(uuid "f44d457e-7bd0-4123-a6f8-dee643813f47")
+	(paper "A4")
+	(lib_symbols
+		(symbol "Neil:ATTINY1624 TSSOP"
+			(exclude_from_sim no)
+			(in_bom yes)
+			(on_board yes)
+			(property "Reference" "IC"
+				(at 49.53 7.62 0)
+				(effects
+					(font
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