6 layers414 × 187.5 mm 8-Bit PC, the printed circuit board in 3D

8-Bit PC

Size: 414 × 187.5 mm
Copper layers: 6
Thickness: 1.6 mm
Parts: 331
Nets: 378
Pads: 1,448
Tracks, vias: 3,210, 681
Pours: 2
Routed: Yes
KiCad: KiCad 9.0 (file 20241229)
Created: 6 Oct 2025
Updated: 12 Dec 2025

Overview

8-Bit PC is an open-source printed circuit board by dragonruler1000, from the dragonruler1000/8-bit_computer repository on GitHub, published under the MIT licence. It is a 6-layer board of 414 × 187.5 mm with 331 parts on 378 nets, routed with 3,210 tracks and 681 vias.

It is built around the 74LS245SC, 74LS173SC and 74LS04PC, with the SA555P, 74LS158DC and AT28C64B-15PU among its other parts. Its parts include 106 resistors, 85 diodes, 76 capacitors, 55 ICs and 7 switches. It belongs with the retro computing and games boards of this library.

Main components

README

README.md

8-bit_computer

This is a 8-bit computer baised on the version that ben eater made on a breadboard.
I made it so i could learn more how to route pcbs and learn how computers work on a more detailed level.
It is programed by the dip switches the 4 possition is for addres and the 8 possition is for instruction/data.

Usage instructions

more detailed instructions are going to be added after i get the pc built and the microcode working.

pictures

Full 3D model
fits in case PCB 3d model Screenshot_20251210_205025 PCB Screenshot_20251210_205303 Case 3d model
Screenshot_20251210_205432 Case is split into two with each part being the same just rotated 180 degrees
Schematic:

BOM

Quantity	Value	Unit Price $	Total price $	price with coupns	Link	running total	running total with coupons	notes	Customer number
10	1k resistor	0.0074	0.074	0.074	https://www.lcsc.com/product-detail/C172669.html	0.08	0.08		1
10	10k resistor	0.03	0.3	0.3	https://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10001&langId=-1&catalogId=10001&productId=691104	0.4	0.4	order in multibles of ten	2
1	100k resistor	0.0072	0.0072	0.0072	https://www.lcsc.com/product-detail/C1367560.html	0.41	0.41		3
30	470 resisrer	0.0333	0.999	0.999	https://www.lcsc.com/product-detail/C1369132.html?s_z=h_Passives%257CResistors%257CThrough%2520Hole%2520Resistors	1.47	1.47	order in multibles of ten	4
1	1M resistor	0.1	0.1	0.1	https://www.digikey.com/en/products/detail/stackpole-electronics-inc/CF14JT1M00/1741316	1.58	1.58		5
1	1M potentiometer	1.23	1.23	1.23	https://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10001&langId=-1&catalogId=10001&productId=2161422	2.88	2.88		6
10	0.01 uF cap	0.2475	2.475	2.475	https://www.lcsc.com/product-detail/C710551.html?s_z=n_DE2E3SA103MN7AT02F	5.5	5.5	order in multibles of five	7
70	0.1 uf cap	0.0502	3.514	3.514	https://www.lcsc.com/product-detail/C2693793.html	9.22	9.22	order in multibles of ten	8
1	1 uf cap	0.0434	0.0434	0.0434	https://www.lcsc.com/product-detail/C1620550.html	9.27	9.27	order in multibles of ten	9
5	555 timer	0.2706	1.353	1.353	https://www.lcsc.com/product-detail/C129708.html?s_z=n_SA555p	10.7	10.7	order in multiples of five	10
2	74LS00	0.5999	1.1998	1.1998	https://www.lcsc.com/product-detail/C181629.html?s_z=n_SN74LS00N	11.97	11.97		11
1	74LS02	0.56	0.56	0.56	https://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10001&langId=-1&catalogId=10001&productId=46287	12.56	12.56		12
5	74ls04	0.2012	1.006	1.006	https://www.lcsc.com/product-detail/C42395516.html?s_z=n_SN74LS04N	13.63	13.63		13
3	74ls08	0.4985	1.4955	1.4955	https://www.lcsc.com/product-detail/C2869595.html?s_z=n_SN74LS08N	15.22	15.22		14
1	74ls32	0.5979	0.5979	0.5979	https://www.lcsc.com/product-detail/C2865704.html?s_z=n_SN74LS32N	15.85	15.85		15
1	74ls107	1.0539	1.0539	1.0539	https://www.lcsc.com/product-detail/C22466323.html	16.97	16.97		16
2	74ls86	0.62	1.24	1.24	https://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10001&langId=-1&catalogId=10001&pa=48098&productId=48098	18.28	18.28		17
1	74LS138	0.81	0.81	0.81	https://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10001&langId=-1&catalogId=10001&productId=46607	19.14	19.14		18
1	74LS139	0.75	0.75	0.75	https://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10001&langId=-1&catalogId=10001&productId=46623	19.94	19.94		19
1	74LS157	0.4148	0.4148	0.4148	https://www.lcsc.com/product-detail/C2863363.html?s_z=n_74LS157	20.38	20.38		20
2	74ls161	0.5363	1.0726	1.0726	https://www.lcsc.com/product-detail/C609766.html?s_z=n_74LS161	21.52	21.52		21
8	74ls173	0.94	7.52	7.52	https://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10001&langId=-1&catalogId=10001&productId=46922	29.49	29.49		22
2	SN74189N	2.984	5.968	5.968	https://www.lcsc.com/product-detail/C1550125.html?s_z=n_SN74LS173AN	35.82	35.82		23
6	74ls245	0.7227	4.3362	4.3362	https://www.lcsc.com/product-detail/C7753.html?s_z=n_SN74LS245N	40.42	40.42		24
1	74ls273	0.7659	0.7659	0.7659	https://www.lcsc.com/product-detail/C2879026.html?s_z=n_SN74LS273N	41.23	41.23		25
5	74ls283	0.3261	1.6305	1.6305	https://www.lcsc.com/product-detail/C968685.html	42.96	42.96		26
3	AT28C64B-15PU	5.5	16.5	16.5	https://www.digikey.com/en/products/detail/microchip-technology/AT28C64B-15PU/1008529?s=N4IgTCBcDaIIIBUwA4DCA2ALAIQLQEYBWABQFUQBdAXyA	60.45	60.45		27
3	Double-throw toggle switch	0.616	1.848	1.848	https://www.lcsc.com/product-detail/C2985935.html	62.41	62.41		28
3	Momentary 6mm tact switch	0.24	0.72	0.72	https://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10001&langId=-1&catalogId=10001&productId=149948	63.17	63.17		29
1	8-position DIP switch	0.3944	0.3944	0.3944	https://www.lcsc.com/product-detail/C458084.html	63.59	63.59		30
1	4-position DIP switch	0.1623	0.1623	0.1623	https://www.lcsc.com/product-detail/C5123702.html	63.76	63.76		31
50	Red LED	0.0251	1.255	1.255	https://www.lcsc.com/product-detail/C99771.html	65.09	65.09	order in multibles of fifty	32
10	Yellow LED	0.0324	0.324	0.324	https://www.lcsc.com/product-detail/C20618149.html	65.43	65.43	order in multibles of ten	33
30	Blue LED	0.0376	1.128	1.128	https://www.lcsc.com/product-detail/C86881.html	66.63	66.63	order in multibles of ten	34
20	Green LED	0.11	2.2	2.2	https://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10001&langId=-1&catalogId=10001&productId=693901	68.96	68.96	order in multibles of ten	35
4	Common cathode 7-segment display	1.04	4.16	4.16	https://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10001&langId=-1&catalogId=10001&productId=17187	73.37	73.37		36
5	USB-C connector	0.085	0.425	0.425	https://www.lcsc.com/product-detail/C5187470.html	73.82	73.82		37
1	PCB	93.5	93.5	73.5	JLCPCB.com	172.93	151.73		38
1	Shipping cost and terifs	64.8	64.8	64.8		241.62	220.42	maybe more then actual cost but added for transpeincy

Category and platform

Retro computing and games

Project files

Show this board on your page

https://pcbkit.io/boards/dragonruler1000/8-bit_computer

The board's own page, for a message or a post.

Source

Repository: dragonruler1000/8-bit_computer
Board file: PCB/8-Bit-PC.kicad_pcb
Commit: b29d47b
Licence: MIT

Parts

331

Qty	Value	Footprint	References
83	220	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R10, R11, R12, R13, R14, R15, R16, R17, R20, R100, R101, R102, R103, R104, R105, R106 +67
64	0.1 µF	Capacitor_THT:C_Radial_D5.0mm_H5.0mm_P2.00mm	C10, C11, C12, C13, C15, C18, C19, C20, C21, C22, C23, C24, C25, C26, C27, C118 +48
52	RED	LED_THT:LED_D3.0mm	D11, D022, D023, D024, D025, D026, D027, D028, D029, D112, D113, D114, D115, D116, D117, D118 +36
17	BLUE	LED_THT:LED_D3.0mm	D1, D38, D39, D40, D41, D42, D43, D44, D45, D46, D47, D48, D49, D50, D51, D52 +1
12	GREEN	LED_THT:LED_D3.0mm	D10, D14, D25, D34, D35, D36, D37, D54, D55, D56, D57, D58
9	10k	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R39, R73, R74, R75, R76, R77, R78, R79, R80
8	1K	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R1, R2, R3, R5, R6, R18, R19, R32
6	0.01 µF	Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm	C1, C2, C3, C4, C5, C6
6	74LS173	Custom:SN74LS173AN	U8, U9, U19, U49, U50, U119
6	74LS245	Custom:DIP254P762X508-20	U7, U17, U25, U29, U48, U117
4	74LS04	Custom:N14	U27, U28, U46, U47
4	D148K	Display_7Segment:D1X8K	U34, U35, U36, U37
4	SA555P	Package_DIP:DIP-8_W7.62mm	U1, U2, U3, U31
4	YELLOW	LED_THT:LED_D3.0mm	D20, D21, D22, D23
3	0.01 µF	Capacitor_THT:C_Radial_D5.0mm_H5.0mm_P2.00mm	C14, C16, C17
3	74LS04	Package_DIP:DIP-14_W7.62mm	U5, U20, U22
3	74LS158	Package_DIP:DIP-16_W7.62mm	U24, U51, U52
3	AT28C64B-15PU	Package_DIP:DIP-28_W15.24mm	U40, U43, U44
3	SW_SPDT	Button_Switch_THT:SW_Slide-03_Wuerth-WS-SLTV_10x2.5x6.4_P2.54mm	SW2, SW4, SW7
2	10 µF	Capacitor_THT:C_Radial_D5.0mm_H5.0mm_P2.00mm	C74, C75
2	1k	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R37, R64
2	5.1 kΩ	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R81, R82
2	74F189SC	Package_DIP:DIP-16_W7.62mm	U21, U23
2	74LS00	Custom:N14	U26, U45
2	74LS08	Package_DIP:DIP-14_W7.62mm	U4, U10
2	74LS161	Custom:N16	U30, U41
2	74LS283	Package_DIP:DIP-16_W7.62mm	U13, U14
2	SW_Push	Button_Switch_THT:SW_PUSH_6mm	SW1, SW6
1	1 µF	Capacitor_THT:C_Radial_D5.0mm_H5.0mm_P2.00mm	C7
1	100k	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R38
1	1M	Potentiometer_THT:Potentiometer_Alpha_RD901F-40-00D_Single_Vertical	RV1
1	1M	Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal	R4
1	74LS02	Custom:N14	U11
1	74LS08	Custom:N14	U39
1	74LS138	Custom:N16	U42
1	74LS139	Package_DIP:DIP-16_W7.62mm	U33
1	74LS157	Custom:N16	U18
1	74LS173	Package_DIP:DIP-16_W7.62mm	U12
1	74LS273	Custom:DIP254P762X508-20	U38
1	74LS32	Package_DIP:DIP-14_W7.62mm	U6
1	74LS76	Package_DIP:DIP-16_W7.62mm	U32
1	74LS86	Custom:N14	U15
1	74LS86	Package_DIP:DIP-14_W7.62mm	U16
1	74ls245	Custom:DIP254P762X508-20	U118
1	SW_DIP_x04	Button_Switch_THT:SW_DIP_SPSTx04_Slide_6.7x11.72mm_W7.62mm_P2.54mm_LowProfile	SW3
1	SW_DIP_x08	Button_Switch_THT:SW_DIP_SPSTx08_Slide_6.7x21.88mm_W7.62mm_P2.54mm_LowProfile	SW5
1	USB_C_Receptacle_PowerOnly_6P	easyeda2kicad:USB-TH_TYPE-C-6P-LCH10.0	J1

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Questions

How big is the 8-Bit PC PCB?

It measures 414 × 187.5 mm and has 6 copper layers, 1.6 mm thick.

What parts does the 8-Bit PC use?

331 parts, built around the 74LS245SC, 74LS173SC, 74LS04PC and SA555P. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the 8-Bit PC KiCad files?

From the dragonruler1000/8-bit_computer repository on GitHub, at the commit this page was made from: the board is PCB/8-Bit-PC.kicad_pcb and its schematic PCB/8-Bit-PC.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the 8-Bit PC design in my own project?

Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

8-Bit PC

Overview

Main components

74LS245SC

74LS173SC

74LS04PC

SA555P

74LS158DC

AT28C64B-15PU

74LS00SC

74LS161DC

74LS02PC

74LS139PC

74LS157PC

74LS273PC

README

8-bit_computer

Usage instructions

pictures

BOM

Parts

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Questions

How big is the 8-Bit PC PCB?

What parts does the 8-Bit PC use?

Where can I download the 8-Bit PC KiCad files?

Can I use the 8-Bit PC design in my own project?