2 layers229.9 × 93.3 mm
2 layers132.1 × 83.8 mm
93c46a type
ethanjamesauto/modular_8bit_computer2- Size
- 132.1 × 83.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 65
- Nets
- 340
- Pads
- 1,025
- Tracks, vias
- 0, 4
- Routed
- Not yet
- KiCad
- KiCad 7 (file 20221018)
- Created
- 18 Aug 2024
- Updated
- 8 Nov 2025
Overview
93c46a type 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 132.1 × 83.8 mm with 65 parts on 340 nets.
It is built around the 74HC595, 74LS00SC and 74LS123FP-E, with the NA555D among its other parts. Its parts include 11 resistors, 5 ICs, 5 diodes, 4 capacitors and 3 connectors.
Main components
4
74HC595
SOP-16-40℃~+85℃ 1 100ns@5V,50pF 10MHz 2V~6V 74HC 8 Serial-to-Serial or Parallel Tri-State SOP-16 Shift Registers ROHSGRShift Registers
74LS00SC
-0℃~+70℃ 15ns@5V,50pF 2 2.7V 2V 4 4.75V~5.25V 400uA 500mV 74LS 800mV 8mA NAND Gate - Logic Gates ROHSTexas InstrumentsLogic Gates74LS123FP-E
-Reset input、Adjustable pulse width、Retriggerable function - Monostable Multivibrators ROHSRenesas ElectronicsMonostable Multivibrators
NA555D
SOIC-8-40℃~+105℃ 1 200mA 2mA 4.5V~16V Adjustable duty cycle oscillation、Reset function SOIC-8 555 Timers / Counters ROHSTexas InstrumentsTimers / Counters
README
README.mdModular 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
// 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;Parts
65| Qty | Value | Footprint | References |
|---|---|---|---|
| 35 | Conn_01x25_Pin | Connector_PinHeader_2.54mm:PinHeader_1x25_P2.54mm_Vertical | JCol1, JCol2, JCol3, JCol4, JCol4, JCol4, JCol4, JCol5, JCol5, JCol5, JCol5, JCol10, JCol10, JCol10, JCol10, JCol10 +19 |
| 5 | 470 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | r1, r8, r11, r12, r13 |
| 5 | VCC | LED_SMD:LED_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D1, D2, D3, D4, D5 |
| 4 | 470 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | r2, r3, r9, r10 |
| 4 | C | Capacitor_THT:C_Disc_D3.0mm_W2.0mm_P2.50mm | C1, C4, C5, C6 |
| 2 | 1 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | r6, r7 |
| 2 | Conn_01x03_Pin | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J2, J3 |
| 1 | 74HC595 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U9 |
| 1 | 74LS00 | Package_DIP:DIP-14_W7.62mm | U5 |
| 1 | 74LS123 | Package_DIP:DIP-16_W7.62mm | U2 |
| 1 | 93CxxA | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | Conn_01x40_Pin | Connector_PinHeader_2.54mm:PinHeader_1x40_P2.54mm_Horizontal | J1 |
| 1 | LOGO | AudioJacks:faryu | G*** |
| 1 | NA555D | Package_DIP:DIP-8_W7.62mm | U4 |
| 1 | SW_SPST | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | SW1 |
Questions
How big is the 93c46a type PCB?
It measures 132.1 × 83.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 93c46a type use?
65 parts, built around the 74HC595, 74LS00SC, 74LS123FP-E and NA555D. 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 93c46a type KiCad files?
From the ethanjamesauto/modular_8bit_computer repository on GitHub, at the commit this page was made from: the board is 93c46a_type/93c46a_type.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the 93c46a type design in my own project?
Its repository states no licence, so its author keeps all rights: ask ethanjamesauto before reusing the design.
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