2 layers229.9 × 93.3 mm Huhhhh I didnt save, the printed circuit board in 3D

Huhhhh I didnt save

Size: 229.9 × 93.3 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 371
Nets: 424
Pads: 1,744
Tracks, vias: 5,763, 286
Pours: 6
Routed: Yes
KiCad: KiCad 7 (file 20221018)
Created: 18 Aug 2024
Updated: 8 Nov 2025

Overview

Huhhhh I didnt save is an open-source printed circuit board by ethanjamesauto, from the ethanjamesauto/modular_8bit_computer repository on GitHub. It is a 2-layer board of 229.9 × 93.3 mm with 371 parts on 424 nets, routed with 5,763 tracks and 286 vias.

It is built around the A13, 74LS245SC and 74LS574N, with the 74LS161DC, 74LS273PC and 74LS00SC among its other parts. Its parts include 142 resistors, 82 diodes, 67 connectors, 49 ICs and 14 capacitors.

Main components

README

README.md

Modular 8-bit Computer

This is the repository for an 8-bit computer system that is built using cards with a standardized interface.

CPU card
Protoboard card
- This card contains an onboard clock generator, address and data registers/buffers, and a protoboard area for testing designs.
Bus interface modeling

Here's an example of a card:

Current Bus Specification

verilog

// The main bus wires (32+8=40 wires total)
// On the bus connector, all buses have LSBs closer to the power pins and MSBs farther away
wire VCC_5V;
wire GND;
wire clk;			      // generated by motherboard clock generator
wire rst_n;			    // probably a button on the motherboard
wire VCC_3V3;
wire we_n;			      // active LOW
wire oe_n;			      // active LOW
wire int_n;			    // pulled up by motherboard; driven down by any peripheral (could be used for interrupts)
wire [7:0] data;
wire [15:0] addr;	  // 64k address space is suppored by default. More address bits may be added later
wire [7:0] aux_bus;

Project files

Show this board on your page

https://pcbkit.io/boards/ethanjamesauto/modular_8bit_computer

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

Source

Repository: ethanjamesauto/modular_8bit_computer
Board file: processor_attempt_1/huhhhh I didnt save.kicad_pcb
Commit: 4215150
Licence: Not stated
Copies: 2 copies in 1 repository

Parts

371

Qty	Value	Footprint	References
82	470	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	r107, r108, r109, r110, r111, r112, r113, r114, r115, r116, r117, r118, r119, r120, r121, r122 +66
37	A0	LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D1, D17, D25, D33, D41, D49, D50, D51, D52, D53, D54, D55, D56, D57, D58, D59 +21
30	J	Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical	J36, J41, J43, J44, J45, J46, J47, J48, J49, J50, J51, J52, J54, J56, J57, J58 +14
28	10k	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R3, R11, R12, R13, R14, R19, R20, R21, R22, R27, R28, R29, R30, R100, R101, R102 +12
24	1k	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R10, R15, R16, R17, R18, R23, R24, R25, R26, R31, R32, R33, R34, R43, R44, R45 +8
12	100nF	Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm	C3, C4, C5, C6, C7, C9, C10, C11, C15, C16, C17, C18
12	FDG1024NZ	Package_TO_SOT_SMD:SOT-23-6_Handsoldering	Q1, Q2, Q3, Q4, Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12
11	Conn_01x08_Pin	Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical	J4, J4, J20, J22, J23, J24, J25, J26, J27, J28, J29
9	74LS574	Package_DIP:DIP-20_W7.62mm_Socket	U6, U7, U25, U26, U27, U44, U45, U47, U54
9	Conn_01x10_Pin	Connector_PinHeader_2.54mm:PinHeader_1x10_P2.54mm_Vertical	J7, J8, J9, J10, J11, J12, J13, J18, J19
8	74LS245	Package_DIP:DIP-20_W7.62mm_Socket	U21, U23, U29, U30, U31, U48, U49, U50
6	A4	LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D5, D21, D29, D37, D45, D82
6	Conn_01x03_Pin	Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical	J1, J31, J32, J33, J34, J69
6	~	Package_DIP:DIP-16_W7.62mm_Socket	U33, U34, U35, U36, U37, U38
5	A1	LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D2, D18, D26, D34, D42
5	A2	LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D3, D19, D27, D35, D43
5	A3	LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D4, D20, D28, D36, D44
5	A5	LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D6, D22, D30, D38, D46
5	A6	LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D7, D23, D31, D39, D47
5	A7	LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D8, D24, D32, D40, D48
4	0	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R103, R104, R105, R106
4	74LS138	Package_DIP:DIP-16_W7.62mm_Socket	U57, U58, U59, U60
4	74LS161	Package_DIP:DIP-16_W7.62mm_Socket	U2, U3, U4, U5
4	Conn_01x01_Pin	Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical	J30, J35, J40, J42
4	Conn_01x06_Pin	Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical	J14, J15, J16, J17
4	R	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R1, R2, R141, R142
3	74LS273	Package_DIP:DIP-20_W7.62mm_Socket	U24, U40, U41
2	28C256	Package_DIP:DIP-28_W15.24mm_Socket	U18, U19
2	74LS00	Package_DIP:DIP-14_W7.62mm_Socket	U52, U53
2	74LS04	Package_DIP:DIP-14_W7.62mm_Socket	U42, U56
2	74LS283	Package_DIP:DIP-16_W7.62mm_Socket	U32, U39
2	C	Capacitor_SMD:C_1206_3216Metric	C1, C2
1	1	Resistor_SMD:R_1206_3216Metric	5V_rsns1
1	5V_RAW	LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D81
1	74HC688	Package_DIP:DIP-20_W7.62mm_Socket	U43
1	74LS161	Package_SO:SOIC-16_3.9x9.9mm_P1.27mm	U51
1	74LS30	Package_DIP:DIP-14_W7.62mm_Socket	U55
1	74LVC1G08	Package_TO_SOT_SMD:SOT-23-6_Handsoldering	U61
1	A10	LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D11
1	A11	LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D12
1	A12	LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D13
1	A13	LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D14
1	A14	LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D15
1	A15	LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D16
1	A8	LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D9
1	A9	LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D10
1	Clock_Aux_Latch_0	Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical	J39
1	Conn_01x40_Pin	Connector_PinHeader_2.54mm:PinHeader_1x40_P2.54mm_Horizontal	J3
1	DB9_Female_MountingHoles	Connector_Dsub:DSUB-9_Female_Horizontal_P2.77x2.84mm_EdgePinOffset4.94mm_Housed_MountingHolesOffset7.48mm	J21
1	HM62256BLP	Package_SO:SOIC-28W_7.5x18.7mm_P1.27mm	U46
1	HM62256BLP	Package_DIP:DIP-28_W15.24mm	U28
1	LOGO	AudioJacks:cat_footprint	G***
1	LOGO	AudioJacks:plant	G***
1	LOGO	AudioJacks:star_footprint	G***
1	LOGO	AudioJacks:piss_quiet	G***
1	NE555D	Package_SO:SOIC-8_3.9x4.9mm_P1.27mm	U1

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Questions

How big is the Huhhhh I didnt save PCB?

It measures 229.9 × 93.3 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Huhhhh I didnt save use?

371 parts, built around the A13, 74LS245SC, 74LS574N and 74LS161DC. 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 Huhhhh I didnt save KiCad files?

From the ethanjamesauto/modular_8bit_computer repository on GitHub, at the commit this page was made from: the board is processor_attempt_1/huhhhh I didnt save.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Huhhhh I didnt save design in my own project?

Its repository states no licence, so its author keeps all rights: ask ethanjamesauto before reusing the design.

Overview

Main components

A13

74LS245SC

74LS574N

74LS161DC

74LS273PC

74LS00SC

74LS04PC

74HC688D

74LS30PC

74LVC1G08Z

HM62256BLP-7

NE555D