changes

.gitignore

@@ -0,0 +1,2 @@
+design/**/*-backups/*.zip
+*.lck

README.md

@@ -10,4 +10,5 @@
 # Arduino Interface
 
 ## Bus Ideas
-- [74HC245](./datasheets/74HC_HCT245.pdf), also possible for GPU buffer switching
+- [74HC245](./datasheets/74HC_HCT245.pdf), bidirectional 3-state bus transciever, also possible for GPU buffer switching
+- [74HC138](./datasheets/74HC_HCT138.pdf), 3->8 address decoder 

design/6502.kicad_pcb

@@ -1,2 +0,0 @@
-(kicad_pcb (version 20240108) (generator "pcbnew") (generator_version "8.0")
-)

design/6502.kicad_prl

@@ -1,83 +0,0 @@
-{
-  "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,
-      "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": [
-      0,
-      1,
-      2,
-      3,
-      4,
-      5,
-      8,
-      9,
-      10,
-      11,
-      12,
-      13,
-      15,
-      16,
-      17,
-      18,
-      19,
-      20,
-      21,
-      22,
-      23,
-      24,
-      25,
-      26,
-      27,
-      28,
-      29,
-      30,
-      32,
-      33,
-      34,
-      35,
-      36,
-      39,
-      40
-    ],
-    "visible_layers": "fffffff_ffffffff",
-    "zone_display_mode": 0
-  },
-  "git": {
-    "repo_password": "",
-    "repo_type": "",
-    "repo_username": "",
-    "ssh_key": ""
-  },
-  "meta": {
-    "filename": "6502.kicad_prl",
-    "version": 3
-  },
-  "project": {
-    "files": []
-  }
-}

design/6502.kicad_sch

@@ -1,203 +0,0 @@
-(kicad_sch
-	(version 20231120)
-	(generator "eeschema")
-	(generator_version "8.0")
-	(uuid "27fa70ec-70f1-4ec5-9aef-43afe5f03596")
-	(paper "A4")
-	(lib_symbols)
-	(sheet
-		(at 148.59 53.34)
-		(size 55.88 29.21)
-		(fields_autoplaced yes)
-		(stroke
-			(width 0.1524)
-			(type solid)
-		)
-		(fill
-			(color 0 0 0 0.0000)
-		)
-		(uuid "1c85a34e-e029-471f-835a-c5cb1e337bcc")
-		(property "Sheetname" "clock_board"
-			(at 148.59 52.6284 0)
-			(effects
-				(font
-					(size 1.27 1.27)
-				)
-				(justify left bottom)
-			)
-		)
-		(property "Sheetfile" "clock_board.kicad_sch"
-			(at 148.59 83.1346 0)
-			(effects
-				(font
-					(size 1.27 1.27)
-				)
-				(justify left top)
-			)
-		)
-		(instances
-			(project "6502"
-				(path "/27fa70ec-70f1-4ec5-9aef-43afe5f03596"
-					(page "3")
-				)
-			)
-		)
-	)
-	(sheet
-		(at 215.9 109.22)
-		(size 53.34 31.75)
-		(fields_autoplaced yes)
-		(stroke
-			(width 0.1524)
-			(type solid)
-		)
-		(fill
-			(color 0 0 0 0.0000)
-		)
-		(uuid "1d965ac9-0bec-4308-b34c-251844cc958f")
-		(property "Sheetname" "lcd_board"
-			(at 215.9 108.5084 0)
-			(effects
-				(font
-					(size 1.27 1.27)
-				)
-				(justify left bottom)
-			)
-		)
-		(property "Sheetfile" "lcd_board.kicad_sch"
-			(at 215.9 141.5546 0)
-			(effects
-				(font
-					(size 1.27 1.27)
-				)
-				(justify left top)
-			)
-		)
-		(instances
-			(project "6502"
-				(path "/27fa70ec-70f1-4ec5-9aef-43afe5f03596"
-					(page "6")
-				)
-			)
-		)
-	)
-	(sheet
-		(at 30.48 36.83)
-		(size 73.66 44.45)
-		(fields_autoplaced yes)
-		(stroke
-			(width 0.1524)
-			(type solid)
-		)
-		(fill
-			(color 0 0 0 0.0000)
-		)
-		(uuid "84677476-d952-4526-bbdb-640c00b36086")
-		(property "Sheetname" "cpu_board"
-			(at 30.48 36.1184 0)
-			(effects
-				(font
-					(size 1.27 1.27)
-				)
-				(justify left bottom)
-			)
-		)
-		(property "Sheetfile" "cpu_board.kicad_sch"
-			(at 30.48 81.8646 0)
-			(effects
-				(font
-					(size 1.27 1.27)
-				)
-				(justify left top)
-			)
-		)
-		(instances
-			(project "6502"
-				(path "/27fa70ec-70f1-4ec5-9aef-43afe5f03596"
-					(page "2")
-				)
-			)
-		)
-	)
-	(sheet
-		(at 132.08 104.14)
-		(size 57.15 34.29)
-		(fields_autoplaced yes)
-		(stroke
-			(width 0.1524)
-			(type solid)
-		)
-		(fill
-			(color 0 0 0 0.0000)
-		)
-		(uuid "e6c14eea-6ae8-44d4-9ce7-edf7fac74b1a")
-		(property "Sheetname" "arduino_board"
-			(at 132.08 103.4284 0)
-			(effects
-				(font
-					(size 1.27 1.27)
-				)
-				(justify left bottom)
-			)
-		)
-		(property "Sheetfile" "arduino_board.kicad_sch"
-			(at 132.08 139.0146 0)
-			(effects
-				(font
-					(size 1.27 1.27)
-				)
-				(justify left top)
-			)
-		)
-		(instances
-			(project "6502"
-				(path "/27fa70ec-70f1-4ec5-9aef-43afe5f03596"
-					(page "4")
-				)
-			)
-		)
-	)
-	(sheet
-		(at 33.02 102.87)
-		(size 68.58 35.56)
-		(fields_autoplaced yes)
-		(stroke
-			(width 0.1524)
-			(type solid)
-		)
-		(fill
-			(color 0 0 0 0.0000)
-		)
-		(uuid "ebd50b7c-771d-43af-8f30-908c96e17caf")
-		(property "Sheetname" "serial_board"
-			(at 33.02 102.1584 0)
-			(effects
-				(font
-					(size 1.27 1.27)
-				)
-				(justify left bottom)
-			)
-		)
-		(property "Sheetfile" "serial_board.kicad_sch"
-			(at 33.02 139.0146 0)
-			(effects
-				(font
-					(size 1.27 1.27)
-				)
-				(justify left top)
-			)
-		)
-		(instances
-			(project "6502"
-				(path "/27fa70ec-70f1-4ec5-9aef-43afe5f03596"
-					(page "5")
-				)
-			)
-		)
-	)
-	(sheet_instances
-		(path "/"
-			(page "1")
-		)
-	)
-)

design/arduino.kicad_sym

@@ -52,7 +52,7 @@
 		(symbol "Mega2650PRO_0_1"
 			(rectangle
 				(start -7.62 -1.27)
-				(end 7.62 -111.76)
+				(end 7.62 -118.11)
 				(stroke
 					(width 0)
 					(type default)
@@ -63,6 +63,38 @@
 			)
 		)
 		(symbol "Mega2650PRO_1_1"
+			(polyline
+				(pts
+					(xy 0 -113.03) (xy 0 -118.11)
+				)
+				(stroke
+					(width 0)
+					(type default)
+				)
+				(fill
+					(type none)
+				)
+			)
+			(polyline
+				(pts
+					(xy 0 -107.95) (xy 0 -102.87) (xy 7.62 -102.87)
+				)
+				(stroke
+					(width 0)
+					(type default)
+				)
+				(fill
+					(type none)
+				)
+			)
+			(text "ICSP\n"
+				(at 0 -110.49 900)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
 			(pin power_in line
 				(at -10.16 -3.81 0)
 				(length 2.54)
@@ -1528,6 +1560,114 @@
 					)
 				)
 			)
+			(pin power_in line
+				(at 10.16 -104.14 180)
+				(length 2.54)
+				(name "5V"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+				(number "81"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+			)
+			(pin output line
+				(at 10.16 -106.68 180)
+				(length 2.54)
+				(name "MISO"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+				(number "82"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+			)
+			(pin input line
+				(at 10.16 -109.22 180)
+				(length 2.54)
+				(name "MOSI"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+				(number "83"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+			)
+			(pin input line
+				(at 10.16 -111.76 180)
+				(length 2.54)
+				(name "SCK"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+				(number "84"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+			)
+			(pin power_in line
+				(at 10.16 -114.3 180)
+				(length 2.54)
+				(name "GND"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+				(number "85"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+			)
+			(pin input line
+				(at 10.16 -116.84 180)
+				(length 2.54)
+				(name "RESET"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+				(number "86"
+					(effects
+						(font
+							(size 1.27 1.27)
+						)
+					)
+				)
+			)
 			(pin input line
 				(at -10.16 -24.13 0)
 				(length 2.54)

design/arduino.pretty/Mega2560Pro.kicad_mod

@@ -4,7 +4,7 @@
 	(generator_version "8.0")
 	(layer "F.Cu")
 	(property "Reference" "REF**"
-		(at 17.72 -7.84 0)
+		(at 19.42 -4.44 0)
 		(unlocked yes)
 		(layer "F.SilkS")
 		(uuid "db9bc0b1-28e1-4764-b3c9-53c8f0f9ef3b")
@@ -16,7 +16,7 @@
 		)
 	)
 	(property "Value" "Mega2560Pro"
-		(at 17.72 -6.34 0)
+		(at 19.42 -2.94 0)
 		(unlocked yes)
 		(layer "F.Fab")
 		(uuid "59a2c308-f4ae-4ad3-b54b-ca21c05b3386")
@@ -28,7 +28,7 @@
 		)
 	)
 	(property "Footprint" ""
-		(at 17.72 -7.34 0)
+		(at 19.42 -3.94 0)
 		(unlocked yes)
 		(layer "F.Fab")
 		(hide yes)
@@ -41,7 +41,7 @@
 		)
 	)
 	(property "Datasheet" ""
-		(at 17.72 -7.34 0)
+		(at 19.42 -3.94 0)
 		(unlocked yes)
 		(layer "F.Fab")
 		(hide yes)
@@ -54,7 +54,7 @@
 		)
 	)
 	(property "Description" ""
-		(at 17.72 -7.34 0)
+		(at 19.42 -3.94 0)
 		(unlocked yes)
 		(layer "F.Fab")
 		(hide yes)
@@ -68,18 +68,51 @@
 	)
 	(attr through_hole)
 	(fp_rect
-		(start -2.54 -2.54)
-		(end 38.1 53.34)
+		(start 0.2 -0.05)
+		(end 38.83 55.71)
 		(stroke
 			(width 0.1)
 			(type default)
 		)
 		(fill none)
 		(layer "F.SilkS")
-		(uuid "3fa80de7-000f-4618-b503-f75893f61301")
+		(uuid "40a0a275-8f60-4d61-8a0a-e5cb9e25b814")
+	)
+	(fp_rect
+		(start 20.69 -1.22)
+		(end 29.81 5.76)
+		(stroke
+			(width 0.2)
+			(type default)
+		)
+		(fill none)
+		(layer "F.SilkS")
+		(uuid "e9d9b42d-8dbc-4ee3-b866-352091460933")
+	)
+	(fp_circle
+		(center 23.19 52.85)
+		(end 24.79 52.85)
+		(stroke
+			(width 0.2)
+			(type default)
+		)
+		(fill none)
+		(layer "F.SilkS")
+		(uuid "1f7ae5bf-d3dc-4b31-a7ad-17bb95ef79d2")
+	)
+	(fp_circle
+		(center 30.25 15.01)
+		(end 31.85 15.01)
+		(stroke
+			(width 0.2)
+			(type default)
+		)
+		(fill none)
+		(layer "F.SilkS")
+		(uuid "3159a93f-ae43-4609-9958-a2f341ac166a")
 	)
 	(fp_text user "${REFERENCE}"
-		(at 17.72 -4.84 0)
+		(at 19.42 -1.44 0)
 		(unlocked yes)
 		(layer "F.Fab")
 		(uuid "d82c9caa-ee92-40ba-9d6f-7fed81389c1d")
@@ -91,643 +124,691 @@
 		)
 	)
 	(pad "1" thru_hole circle
-		(at 2.54 0)
+		(at 4.24 3.4)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "be199cad-066a-469b-8504-fc79b7354aea")
+		(uuid "7ec2639b-f307-4637-bc04-a2bcc6383315")
 	)
 	(pad "2" thru_hole circle
-		(at 0 0)
+		(at 1.7 3.4)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "7aa0dbbd-2e35-4594-98ab-dc0d32b2614f")
+		(uuid "692d3431-2a8a-41df-b3c2-b825501e2a5b")
 	)
 	(pad "3" thru_hole circle
-		(at 2.54 2.54)
+		(at 4.24 5.94)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "cdac692e-eea1-44a8-974e-d4f4ce2e6724")
+		(uuid "576158c0-970f-434c-92f3-fcb74a2261a9")
 	)
 	(pad "4" thru_hole circle
-		(at 0 2.54)
+		(at 1.7 5.94)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "085af7be-2246-48c9-a2b0-557d21114e00")
+		(uuid "738ffed4-5953-4fe2-aee9-78e21f8b78d8")
 	)
 	(pad "5" thru_hole circle
-		(at 2.54 5.08)
+		(at 4.24 8.48)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "7d29d284-214b-4caa-910d-5fdb3a6b1581")
+		(uuid "9cbd2f6e-2b97-4624-8bfc-3a2813d9155d")
 	)
 	(pad "6" thru_hole circle
-		(at 0 5.08)
+		(at 1.7 8.48)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "5eee56f6-9bdf-4933-b691-5083acffa0bd")
+		(uuid "0b0edc50-3ac9-4c49-a529-fdde7a1f6245")
 	)
 	(pad "7" thru_hole circle
-		(at 2.54 7.62)
+		(at 4.24 11.02)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "786ce686-70a2-428f-9cf9-35274e0ec2f1")
+		(uuid "dae8fbf7-956e-4855-8769-05b0a4e7b4a3")
 	)
 	(pad "8" thru_hole circle
-		(at 0 7.62)
+		(at 1.7 11.02)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "8632d002-f5da-4183-98c9-49c9b3744277")
+		(uuid "d5cf48df-699c-4166-b1c5-eb5d71089265")
 	)
 	(pad "9" thru_hole circle
-		(at 2.54 10.16)
+		(at 4.24 13.56)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "de0a185d-26f6-4e2d-9859-f85bb991db65")
+		(uuid "92226031-0ae9-42a7-b41f-a3901445d7a0")
 	)
 	(pad "10" thru_hole circle
-		(at 0 10.16)
+		(at 1.7 13.56)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "0f2d8ff7-0f37-464c-9fbf-42f5868f412a")
+		(uuid "3eb9271f-1daa-4334-b1ae-bdbe3878b9f9")
 	)
 	(pad "11" thru_hole circle
-		(at 2.54 12.7)
+		(at 4.24 16.1)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "6d5fcea5-7b7b-43b1-b8b6-1d8e1edb35fc")
+		(uuid "cdc20b9f-fb4e-4b1d-8f9f-3f0cedfb32df")
 	)
 	(pad "12" thru_hole circle
-		(at 0 12.7)
+		(at 1.7 16.1)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "9dbbaff8-46e5-4de4-9060-fe534b9c999c")
+		(uuid "f5df85f3-0cce-4c33-8654-cc03420e8345")
 	)
 	(pad "13" thru_hole circle
-		(at 2.54 15.24)
+		(at 4.24 18.64)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "f68ba281-ceb9-40c7-9b53-44d53bb93344")
+		(uuid "0a56fa8a-9019-4ba1-81e6-26d38fea3641")
 	)
 	(pad "14" thru_hole circle
-		(at 0 15.24)
+		(at 1.7 18.64)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "9f6567e0-9147-4ac9-8e13-99df73c57636")
+		(uuid "0f6e25ab-a55c-4d69-84b1-e6b8e775ab03")
 	)
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 		(layers "*.Cu" "*.Mask")
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+		(uuid "37ea205a-ba63-4128-aae3-62bc59c72a30")
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 		(layers "*.Cu" "*.Mask")
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-		(uuid "27534d4b-e9ae-40c0-9620-a88123ba0a3e")
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 		(remove_unused_layers no)
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+		(uuid "f9f7a8da-a86d-48fc-bcc4-96eeecd5ed9c")
 	)
 	(pad "65" thru_hole circle
-		(at 35.56 40.64)
+		(at 37.26 44.04)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "fceb60f3-1986-4f7d-a4cb-ea761461f8f2")
+		(uuid "c0b97fcd-7109-4ffb-af59-07cee77fdd28")
 	)
 	(pad "66" thru_hole circle
-		(at 33.02 40.64)
+		(at 34.72 44.04)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "b64eed81-4c70-4630-8aca-258e3e6c3591")
+		(uuid "bc601e71-c4f9-4b4c-9a24-234d797a58eb")
 	)
 	(pad "67" thru_hole circle
-		(at 35.56 43.18)
+		(at 37.26 46.58)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "94df749f-c28f-49e2-b290-43f3b6353f54")
+		(uuid "fd974ca0-31f0-4dba-96ef-96eae7758ec5")
 	)
 	(pad "68" thru_hole circle
-		(at 33.02 43.18)
+		(at 34.72 46.58)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "7f81d682-2e8e-4936-a081-38e4de1e3abc")
+		(uuid "a7bbc41b-2c19-440f-a685-a89893a17c67")
 	)
 	(pad "69" thru_hole circle
-		(at 35.56 45.72)
+		(at 37.26 49.12)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "4e9bc9a6-6c56-4044-b501-4c37724384fb")
+		(uuid "942ee776-a6af-4861-aaa1-bfd3ad5ada01")
 	)
 	(pad "70" thru_hole circle
-		(at 33.02 45.72)
+		(at 34.72 49.12)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "68c9fa52-fac9-4d3e-b128-b2ad8a13ae2a")
+		(uuid "9cdf3724-8ff6-422b-9d5f-89083f7a7248")
 	)
 	(pad "71" thru_hole circle
-		(at 35.56 48.26)
+		(at 37.26 51.66)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "2d66f8df-2e1b-4409-a8de-e3bdaee13be8")
+		(uuid "e7624c98-27be-489b-8ebd-ed783bed973e")
 	)
 	(pad "72" thru_hole circle
-		(at 33.02 48.26)
+		(at 34.72 51.66)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "d552c741-3635-4a94-9f6b-0c3e81c7951c")
+		(uuid "6fb09f31-208d-4ad4-a2e2-8ead893baa8a")
 	)
 	(pad "73" thru_hole circle
-		(at 35.56 50.8)
+		(at 37.26 54.2)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "fc02d945-1ce6-470d-91aa-d52978f0332d")
+		(uuid "553d663e-7975-4112-bd6d-60b8ffb9cd2f")
 	)
 	(pad "74" thru_hole circle
-		(at 33.02 50.8)
+		(at 34.72 54.2)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "e4616dd9-6ba6-42c9-8fb0-fec0ec3c5641")
+		(uuid "145e7009-ada0-4648-8fb3-d3e8eefea1f4")
 	)
 	(pad "75" thru_hole circle
-		(at 30.48 50.8)
+		(at 32.18 54.2 270)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "1b0175c8-2eaa-49e3-a9e0-c11a9ca3a03b")
+		(uuid "e79fc5c6-64ca-44c9-981c-f8c1a27f06c5")
 	)
 	(pad "76" thru_hole circle
-		(at 30.48 48.26)
+		(at 32.18 51.66 270)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "ddd01394-033c-42c2-a714-380be104e294")
+		(uuid "2fcd7c7e-38d1-499b-8994-f745ec157b9b")
 	)
 	(pad "77" thru_hole circle
-		(at 27.94 50.8)
+		(at 29.64 54.2 270)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "762557f8-8bd5-44db-8f7c-71514d55db73")
+		(uuid "0b9f076c-3e48-4bad-853c-8578d4428830")
 	)
 	(pad "78" thru_hole circle
-		(at 27.94 48.26)
+		(at 29.64 51.66 270)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "3afe7964-5be2-474c-ad14-858523881011")
+		(uuid "0a2b150e-8b85-41b6-983e-5f129b53a813")
 	)
 	(pad "79" thru_hole circle
-		(at 25.4 50.8)
+		(at 27.1 54.2 270)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "99e0692e-cbf2-4fd9-9cfc-df92b70a4172")
+		(uuid "47575a9e-bd5e-4d8c-b8c7-83b455583d9c")
 	)
 	(pad "80" thru_hole circle
-		(at 25.4 48.26)
+		(at 27.1 51.66 270)
 		(size 1.524 1.524)
 		(drill 0.762)
 		(layers "*.Cu" "*.Mask")
 		(remove_unused_layers no)
-		(uuid "d5037cfc-1348-4d0a-a70c-f24e8e0fb885")
+		(uuid "16e011e3-44aa-4853-b4b6-b19b9794604e")
+	)
+	(pad "81" thru_hole circle
+		(at 19.48 54.2 270)
+		(size 1.524 1.524)
+		(drill 0.762)
+		(layers "*.Cu" "*.Mask")
+		(remove_unused_layers no)
+		(uuid "e7b7ac52-c08e-4593-b440-e48b69bc2ecf")
+	)
+	(pad "82" thru_hole circle
+		(at 19.48 51.66 270)
+		(size 1.524 1.524)
+		(drill 0.762)
+		(layers "*.Cu" "*.Mask")
+		(remove_unused_layers no)
+		(uuid "b58e4429-9b22-49a7-94c1-1c7734b2a4c7")
+	)
+	(pad "83" thru_hole circle
+		(at 16.94 54.2 270)
+		(size 1.524 1.524)
+		(drill 0.762)
+		(layers "*.Cu" "*.Mask")
+		(remove_unused_layers no)
+		(uuid "266b5e9f-1361-48b6-804e-3698ddbb9928")
+	)
+	(pad "84" thru_hole circle
+		(at 16.94 51.66 270)
+		(size 1.524 1.524)
+		(drill 0.762)
+		(layers "*.Cu" "*.Mask")
+		(remove_unused_layers no)
+		(uuid "59e501fb-07f4-47e5-8f8b-c1aafc8d5b6e")
+	)
+	(pad "85" thru_hole circle
+		(at 14.4 54.2 270)
+		(size 1.524 1.524)
+		(drill 0.762)
+		(layers "*.Cu" "*.Mask")
+		(remove_unused_layers no)
+		(uuid "056f7491-bf64-4e48-bce1-57d093e5c2a6")
+	)
+	(pad "86" thru_hole circle
+		(at 14.4 51.66 270)
+		(size 1.524 1.524)
+		(drill 0.762)
+		(layers "*.Cu" "*.Mask")
+		(remove_unused_layers no)
+		(uuid "12acfaf4-bff3-4275-83aa-361df087dce2")
 	)
 )

design/arduino_board.kicad_sch

@@ -1,8 +0,0 @@
-(kicad_sch
-	(version 20231120)
-	(generator "eeschema")
-	(generator_version "8.0")
-	(uuid "024d9314-6101-4648-b6a9-60a4a09a2ede")
-	(paper "A4")
-	(lib_symbols)
-)

design/clock_board.kicad_sch

@@ -1,8 +0,0 @@
-(kicad_sch
-	(version 20231120)
-	(generator "eeschema")
-	(generator_version "8.0")
-	(uuid "ce8dcaa4-6718-4c1b-b3e3-a3e5483835b5")
-	(paper "A4")
-	(lib_symbols)
-)

design/cpu_board/cpu_board.kicad_pcb

@@ -0,0 +1,2 @@
+(kicad_pcb (version 20241229) (generator "pcbnew") (generator_version "9.0")
+)

design/cpu_board/cpu_board.kicad_prl

@@ -0,0 +1,98 @@
+{
+  "board": {
+    "active_layer": 0,
+    "active_layer_preset": "",
+    "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",
+      "drc_exclusions",
+      "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": "cpu_board.kicad_prl",
+    "version": 5
+  },
+  "net_inspector_panel": {
+    "col_hidden": [],
+    "col_order": [],
+    "col_widths": [],
+    "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": -1
+  },
+  "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
+    }
+  }
+}

design/cpu_board/cpu_board.kicad_pro

@@ -16,6 +16,7 @@
       "mfg": "",
       "mpn": ""
     },
+    "layer_pairs": [],
     "layer_presets": [],
     "viewports": []
   },
@@ -203,17 +204,21 @@
       "bus_entry_needed": "error",
       "bus_to_bus_conflict": "error",
       "bus_to_net_conflict": "error",
-      "conflicting_netclasses": "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",
@@ -226,9 +231,15 @@
       "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",
+      "undefined_netclass": "error",
       "unit_value_mismatch": "error",
       "unresolved_variable": "error",
       "wire_dangling": "error"
@@ -239,8 +250,8 @@
     "pinned_symbol_libs": []
   },
   "meta": {
-    "filename": "6502.kicad_pro",
-    "version": 1
+    "filename": "cpu_board.kicad_pro",
+    "version": 3
   },
   "net_settings": {
     "classes": [
@@ -255,6 +266,7 @@
         "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,
@@ -263,7 +275,7 @@
       }
     ],
     "meta": {
-      "version": 3
+      "version": 4
     },
     "net_colors": null,
     "netclass_assignments": null,
@@ -285,7 +297,7 @@
   },
   "schematic": {
     "annotate_start_num": 0,
-    "bom_export_filename": "",
+    "bom_export_filename": "${PROJECTNAME}.csv",
     "bom_fmt_presets": [],
     "bom_fmt_settings": {
       "field_delimiter": ",",
@@ -306,40 +318,53 @@
           "name": "Reference",
           "show": true
         },
-        {
-          "group_by": true,
-          "label": "Value",
-          "name": "Value",
-          "show": true
-        },
-        {
-          "group_by": false,
-          "label": "Datasheet",
-          "name": "Datasheet",
-          "show": true
-        },
-        {
-          "group_by": false,
-          "label": "Footprint",
-          "name": "Footprint",
-          "show": true
-        },
         {
           "group_by": false,
           "label": "Qty",
           "name": "${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,
-      "name": "Grouped By Value",
+      "include_excluded_from_bom": true,
+      "name": "Default Editing",
       "sort_asc": true,
       "sort_field": "Reference"
     },
@@ -373,6 +398,7 @@
     "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,
@@ -384,28 +410,8 @@
   },
   "sheets": [
     [
-      "27fa70ec-70f1-4ec5-9aef-43afe5f03596",
+      "7997bb75-67c5-4059-a258-ca352fda42f5",
       "Root"
-    ],
-    [
-      "84677476-d952-4526-bbdb-640c00b36086",
-      "cpu_board"
-    ],
-    [
-      "1c85a34e-e029-471f-835a-c5cb1e337bcc",
-      "clock_board"
-    ],
-    [
-      "e6c14eea-6ae8-44d4-9ce7-edf7fac74b1a",
-      "arduino_board"
-    ],
-    [
-      "ebd50b7c-771d-43af-8f30-908c96e17caf",
-      "serial_board"
-    ],
-    [
-      "1d965ac9-0bec-4308-b34c-251844cc958f",
-      "lcd_board"
     ]
   ],
   "text_variables": {}

design/cpu_board/sym-lib-table

@@ -0,0 +1,5 @@
+(sym_lib_table
+  (version 7)
+  (lib (name "6502")(type "KiCad")(uri "C:/Users/Maxime Vorwerk/Documents/source/6502/design/6502.kicad_sym")(options "")(descr ""))
+  (lib (name "74xxLogic")(type "KiCad")(uri "C:/Users/Maxime Vorwerk/Documents/source/6502/design/74xxLogic.kicad_sym")(options "")(descr ""))
+)

design/fp-lib-table

@@ -1,4 +0,0 @@
-(fp_lib_table
-  (version 7)
-  (lib (name "Arduino")(type "KiCad")(uri "${KIPRJMOD}/arduino.pretty")(options "")(descr ""))
-)

design/lcd_board.kicad_sch

@@ -1,8 +0,0 @@
-(kicad_sch
-	(version 20231120)
-	(generator "eeschema")
-	(generator_version "8.0")
-	(uuid "5b260d0f-5fae-4ba4-b740-e25b9991caa6")
-	(paper "A4")
-	(lib_symbols)
-)

design/serial_board.kicad_sch

@@ -1,8 +0,0 @@
-(kicad_sch
-	(version 20231120)
-	(generator "eeschema")
-	(generator_version "8.0")
-	(uuid "f0424923-daf9-4b59-bbc7-48543f0e6d73")
-	(paper "A4")
-	(lib_symbols)
-)

design/sym-lib-table

@@ -1,5 +0,0 @@
-(sym_lib_table
-  (version 7)
-  (lib (name "6502")(type "KiCad")(uri "${KIPRJMOD}/6502.kicad_sym")(options "")(descr ""))
-  (lib (name "Arduino")(type "KiCad")(uri "${KIPRJMOD}/arduino.kicad_sym")(options "")(descr ""))
-)

design/~6502.kicad_sch.lck

@@ -1 +0,0 @@
-{"hostname":"MAXIMESPC","username":"Maxime Vorwerk"}

notes/cpu.md

@@ -0,0 +1,16 @@
+# CPU board
+
+## Components
+- CPU: [W65C02](../datasheets/w65c02s.pdf)
+- RAM: [LY62256PL-5LL](../datasheets/LY62256PL-55LL.pdf)
+- ROM: [AT28C64B](../datasheets/AT28C64B.pdf)
+- Register: [74HC377](../datasheets/74HC_HCT377.pdf)
+
+## Register
+- Address 0x5FFF/0b0101_1111_1111_1111
+- decode using [74HC20](../datasheets/74HC20.pdf), [74HC00](../datasheets/74hc00.pdf) 
+- $b_{15},\dots,b_0$
+- $\overline E=\neg(b_0\land b_1\land b_2\land b_3)\land\neg(b_4\land b_5\land b_6\land b_7)\land\neg(b_8\land b_9\land b_{10}\land b_{11})\land\neg(b_{12}\land b_{14})\land (b_{13}\lor b_{15})$
+
+## Timings
+- PHI2 target: 10MHz -> 100ns

notes/ethernet.md

@@ -0,0 +1,2 @@
+# Ethernet
+- [ENC28J60](./../datasheets/ENC28J60.pdf)

notes/memory-layout.md

@@ -2,30 +2,33 @@
 - bank switching using 8-Bit register
 - top 32K remain untouched
 
+# [CPU](./cpu.md)
 | start  | end    | use                     |
 | :----- | :----- | :---------------------- |
-| 0x8000 | 0x8000 | bank switching register |
-| 0x8001 | 0xDFFF | RAM                     |
+| 0x0000 | 0x5FFE | RAM                     |
+| 0x5FFF | 0x5FFF | bank switching register |
+| 0x6000 | 0xDFFF | --- to be mapped ---    |
 | 0xE000 | 0xFFFF | ROM                     |
 
-# Default (0X00)
+# I/O (0x00)
 | start  | end    | use |
 | :----- | :----- | :-- |
-| 0x0000 | 0x7FFF | I/O |
+| 0x6000 | 0xDFFF | I/O |
 
 # [Persistent Memory](./persistent-memory.md) (0x01)
 | start  | end    | use     |
 | :----- | :----- | :------ |
-| 0x0000 | 0x7FFF | storage |
+| 0x6000 | 0xDFFF | storage |
 
 # [Monochrome Video](./monochrome-video.md) (0x0E, 0x0F)
-| start  | end    | use              |
-| :----- | :----- | :--------------- |
-| 0x0000 | 0x4AFF | VRAM             |
-| 0x6000 | 0x7FFF | character memory |
+| start  | end    | use               |
+| :----- | :----- | :---------------- |
+| 0x6000 | 0xAAFF | VRAM              |
+| 0xC000 | 0xDFFF | auxilliary memory |
 
 # [Color Video](./color-video.md) (0x10-0x19)
-| start  | end    | use  | bank      |
-| :----- | :----- | :--- | :-------- |
-| 0x0000 | 0x7FFF | VRAM | 0x10-0x18 |
-| 0x0000 | 0x3FFF | VRAM | 0x19      |
+| start  | end    | use               | bank      |
+| :----- | :----- | :---------------- | :-------- |
+| 0x6000 | 0xDFFF | VRAM              | 0x10-0x18 |
+| 0x6000 | 0x9FFF | VRAM              | 0x19      |
+| 0xA000 | 0xDFFF | auxilliary memory | 0x19      |

notes/monochrome-video.md

@@ -8,6 +8,7 @@
 - split in half
 - each half into page (0x0000 - 0x4AFF)
 - map character memory into top (0x6000 - 0x7FFF)
+- offset of 0x6000 into memory bus -> (0x6000 - 0xAAFF), (0xC000 - 0xDFFF)
 
 ## Design
 - derive CS from bank register, leave LSB free -> wire to MSB of VRAM address