2 layers370.8 × 298.5 mm
8 Bit Computer
The-Invent0r/8-bit-Computer-PCB
These are the KiCAD files for my 8-Bit Computer.
323 parts142
2 layers190.5 × 127 mm
SBC4040
ryomuk/SBC40403Single Board Computer using Intel 4040
- Size
- 190.5 × 127 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 149
- Nets
- 185
- Pads
- 689
- Tracks, vias
- 1,742, 165
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 22 Feb 2024
- Updated
- 17 Sep 2026
Overview
SBC4040 is an open-source printed circuit board by ryomuk, from the ryomuk/SBC4040 repository on GitHub, published under the MIT licence. It is a 2-layer board of 190.5 × 127 mm with 149 parts on 185 nets, routed with 1,742 tracks and 165 vias.
It is built around the 74LS00SC, 74HC14 and 74HC74D, with the 74HCT00D, 74LS02PC and 74LS04PC among its other parts. Its parts include 42 resistors, 38 diodes, 26 capacitors, 22 ICs and 6 connectors. It belongs with the computers and single-board computers and retro computing and games boards of this library.
Main components
7
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 Gates
74HC14
SOP-14-40℃~+85℃ 1.9V、3.98V、4.4V、5.48V、5.9V 100mV、260mV、260mV 20uA 25ns@4.5V,50pF 2V~6V 6 74HC Noise suppression function Schmitt trigger SOP-14 Inverters ROHSJSMSEMIInverters74HC74D
SOIC-14-40℃~+125℃ 1 15ns 2 2V~6V 3.5pF 37ns@6V,50pF 3ns、3ns、3ns 40uA 5.2mA 5.2mA 74HC Series 82MHz Asynchronous Complementary D-Type Rising Edge Set and Reset SOIC-14 Flip Flops ROHSNexperiaFlip Flops74HCT00D
SO-14-40℃~+125℃ 100mV、400mV 12ns@4.5V,50pF 2 2V 3.7V、4.4V 4 4.5V~5.5V 40uA 4mA 4mA 74HCT Series 800mV NAND Gate Overvoltage-tolerant input TTL Compatible CMOS SO-14 Logic Gates ROHSNexperiaLogic Gates
74LS02PC
DIP-140℃~+70℃ 15ns@5V,15pF 2 2.7V 2V 4 4.75V~5.25V 400uA 500mV 74LS 800mV 8mA 8mA NOR Gate DIP-14 Logic Gates ROHSonsemiLogic Gates74LS04PC
PDIP-140℃~+70℃ 4.75V~5.25V 6 6.6mA 74LS PDIP-14 InvertersonsemiInverters
74LS161DC
-0℃~+70℃ 14ns 32MHz 4 4.75V~5.25V 74LS 93mW Asynchronous Binary Counter Programmable divide ratio、Reset function、Cascade counter、Synchronous counting Rising Edge Synchronous - Counters, DividersTexas InstrumentsCounters, Dividers
README
README.mdSBC4040
Single Board Computer using Intel 4040
This document is written mostly in Japanese. If necessary, please use a translation service such as DeepL (I recommend this) or Google.
概要
CPUにIntel 4040を採用したシングルボードコンピュータです．4004実験用ボードをベースにして作りました．4004版と完全上位互換なはず．4040の代わりに4004も載せられるようにしてあります．(絶対に同時には搭載しないこと!)
4040にすることによって追加された機能は下記の通りです．
- ROM領域が4KBから8KBに増加
- サブルーチンコールが3段から7段に増加
- PMR命令により，プログラム領域のRAMを直接読めるようになったはず(未確認)
- 割り込み機能
- ステップ実行は使い道が無さそうなので端子だけ出して未実装
ToDo
- 割り込み機能の動作確認
- 拡張ROM領域(CMROM1)の動作確認
- PMR命令の動作確認
- モニタプログラム，VTL, 8080エミュレータ等を4040用にリライト
ブログ
関連する情報が書いてあるかも．
動画
Youtubeで関連動画を公開しています．
参考にした文献，サイト
データシート
ソフトウェア開発環境
更新履歴
- 2024/2/22: 初版公開
Parts
149| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | LED | 000_MyFootprint:LED_D3.0mm | D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16, D17 |
| 15 | 10k | 000_MyFootprint:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1, R2, R4, R5, R10, R12, R24, R25, R26, R27, R28, R29, R30, R31, R39 |
| 14 | 0.1uF | 000_MyFootprint:C_Disc_D4.3mm_W1.9mm_P5.00mm | C4, C5, C7, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24 |
| 12 | 1N4148 | 000_MyFootprint:D_DO-35_SOD27_P2.54mm_Vertical_AnodeUp | D21, D22, D23, D24, D25, D26, D27, D28, D29, D30, D31, D32 |
| 10 | 100k | 000_MyFootprint:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R7, R9, R14, R16, R32, R33, R34, R40, R41, R42 |
| 6 | 100k | 000_MyFootprint:R_Array_SIP5 | RN1, RN2, RN3, RN4, RN5, RN6 |
| 5 | 1k | 000_MyFootprint:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R3, R6, R8, R11, R17 |
| 5 | 1uF | 000_MyFootprint:C_Disc_D4.7mm_W2.5mm_P5.00mm | C1, C2, C6, C8, C11 |
| 4 | 4.7k | 000_MyFootprint:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R35, R36, R37, R38 |
| 4 | MountingHole | 000_MyFootprint:MountingHole_3mm | H1, H2, H3, H4 |
| 3 | 0.01uF | 000_MyFootprint:C_Disc_D4.3mm_W1.9mm_P5.00mm | C9, C10, C12 |
| 3 | 1N4148 | 000_MyFootprint:D_DO-35_SOD27_P7.62mm_Horizontal | D1, D18, D33 |
| 2 | 110 | 000_MyFootprint:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R18, R19 |
| 2 | 12k | 000_MyFootprint:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R13, R15 |
| 2 | 4002-1 | 000_MyFootprint:DIP-16_W7.62mm | U7, U8 |
| 2 | 4002-2 | 000_MyFootprint:DIP-16_W7.62mm | U9, U10 |
| 2 | 47uF | 000_MyFootprint:CP_Radial_D6.3mm_P2.50mm | C25, C26 |
| 2 | 5.6k | 000_MyFootprint:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R22, R23 |
| 2 | 74LS00 | 000_MyFootprint:DIP-14_W7.62mm | U13, U19 |
| 2 | 820 | 000_MyFootprint:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R20, R21 |
| 2 | HM628128 | 000_MyFootprint:DIP-32_W15.24mm | U17, U18 |
| 1 | +5V | 000_MyFootprint:Banana_Jack_1Pin | J4 |
| 1 | -10V | 000_MyFootprint:Banana_Jack_1Pin | J6 |
| 1 | 10uF | 000_MyFootprint:C_Disc_D4.7mm_W2.5mm_P5.00mm | C3 |
| 1 | 1N4735 | 000_MyFootprint:D_DO-41_SOD81_P7.62mm_Horizontal | D35 |
| 1 | 1N4742 | 000_MyFootprint:D_DO-41_SOD81_P7.62mm_Horizontal | D36 |
| 1 | 28C64B | 000_MyFootprint:DIP_Socket-28_W11.9_W12.7_W15.24_W17.78_W18.5_3M_228-1277-00-0602J | U16 |
| 1 | 4004_CPU | 000_MyFootprint:DIP_Socket-16_W4.3_W5.08_W7.62_W10.16_W10.9_3M_216-3340-00-0602J | U6 |
| 1 | 4040_CPU | 000_MyFootprint:DIP_Socket-24_W11.9_W12.7_W15.24_W17.78_W18.5_3M_224-1275-00-0602J | U5 |
| 1 | 4081 | 000_MyFootprint:DIP-14_W7.62mm | U2 |
| 1 | 4093B | 000_MyFootprint:DIP-14_W7.62mm | U4 |
| 1 | 4289_MEMORY_IF | 000_MyFootprint:DIP_Socket-40_W11.9_W12.7_W15.24_W17.78_W18.5_3M_240-1280-00-0602J | U22 |
| 1 | 5.185MHz | 000_MyFootprint:Crystal_HC49-U_Vertical | Y1 |
| 1 | 50pF | 000_MyFootprint:C_Disc_D4.3mm_W1.9mm_P5.00mm | C13 |
| 1 | 74HC14 | 000_MyFootprint:DIP-14_W7.62mm | U3 |
| 1 | 74HC74 | 000_MyFootprint:DIP-14_W7.62mm | U11 |
| 1 | 74HCT00 | 000_MyFootprint:DIP-14_W7.62mm | U1 |
| 1 | 74LS02 | 000_MyFootprint:DIP-14_W7.62mm | U20 |
| 1 | 74LS04 | 000_MyFootprint:DIP-14_W7.62mm | U12 |
| 1 | 74LS161 | 000_MyFootprint:DIP-16_W7.62mm | U15 |
| 1 | 74LS541 | 000_MyFootprint:DIP-20_W7.62mm | U21 |
| 1 | DS0026CN | 000_MyFootprint:DIP-8_W7.62mm | U14 |
| 1 | GND | 000_MyFootprint:Banana_Jack_1Pin | J5 |
| 1 | INT | 000_MyFootprint:SW_PUSH_6mm_H4.3mm | SW3 |
| 1 | INTA | 000_MyFootprint:LED_D3.0mm | D19 |
| 1 | LED(-10V) | 000_MyFootprint:LED_D3.0mm | D38 |
| 1 | LED(5V) | 000_MyFootprint:LED_D3.0mm | D34 |
| 1 | LED(SBY) | 000_MyFootprint:LED_D3.0mm | D37 |
| 1 | RESET | 000_MyFootprint:SW_PUSH_6mm_H4.3mm | SW2 |
| 1 | STEP | 000_MyFootprint:PinSocket_1x04_P2.54mm_Vertical | J2 |
| 1 | STPA | 000_MyFootprint:LED_D3.0mm | D20 |
| 1 | SW_DPDT | 000_MyFootprint:SW_DPDT_Toggle_with_mount | SW4 |
| 1 | UART(TTL) | 000_MyFootprint:PinHeader_1x06_P2.54mm_Horizontal | J1 |
| 1 | UVROM | 000_MyFootprint:PinHeader_1x02_P2.54mm_Vertical | J3 |
| 1 | ~{TEST} | 000_MyFootprint:SW_PUSH_6mm_H4.3mm | SW1 |
Questions
How big is the SBC4040 PCB?
It measures 190.5 × 127 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SBC4040 use?
149 parts, built around the 74LS00SC, 74HC14, 74HC74D and 74HCT00D. 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 SBC4040 KiCad files?
From the ryomuk/SBC4040 repository on GitHub, at the commit this page was made from: the board is hardware/rev1.1/SBC4040.kicad_pcb and its schematic hardware/rev1.1/ClockGen.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the SBC4040 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).
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