ALU0
About the ALU0 PCB
ALU0 is an open source PCB design by Left-Hand, published on GitHub. It is a 2-layer board measuring 100 × 100 mm, with 66 components from 20 distinct parts.
Other key parts include the 74LS194, 74LS240, 74LS165, 74LS574 and 74LS595. By type, the board carries 20 capacitors, 19 ICs, 9 connectors, 9 diodes and 9 resistors.
From the project
An logic gate computer made of 74 gates
核心频率期待值为16Mhz，保守预估为8Mhz（暂未测试，待实体机研制出来后测试） 绝大多数指令为1T，不使用微指令 部分另外说明 使用冯·诺伊曼架构（最初是使用哈佛架构） * 使用74门作为本计算机的核心组件，并且不使用其他可编程组件（单片机，FPGA，CPLD等）
支持VGA显卡，分辨率为256240。为4片is62c256分为两组乒乓工作，能够硬件上下回滚，自动修改地址为下一个字符 包含2个16位定时器，可屏蔽计时器信号，产生7位权中断 PC(program counter)程序计数器为24位，能够寻址宽度为2M，前一半分配给AT28系列或是W27C系列芯片作为引导程序，后半部分为单片8Mbit的 sram，用于储存数据和运行程序 * 支持硬件ALU加速乘除操作，需要配置ALU相关寄存器，核心运算部分在16个时钟内完成（不包括配置寄存器及载入读出）
Main components on the ALU0
ALU0 bill of materials (BOM)
66 components, 20 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 74LS194 | DIP-16_W7.62mm | U1, U2 |
| 2 | 74LS240 | DIP-20_W7.62mm | U3, U7 |
| 2 | 74LS165 | DIP-16_W7.62mm | U4, U17 |
| 2 | 74LS574 | DIP-20_W7.62mm | U5, U6 |
| 2 | 74LS595 | DIP-16_W7.62mm | U8, U9 |
| 2 | 74LS74 | DIP-14_W7.62mm | U10, U11 |
| 2 | 74LS00 | DIP-14_W7.62mm | U12, U13 |
| 1 | 74LS27 | DIP-14_W7.62mm | U14 |
| 1 | 74LS02 | DIP-14_W7.62mm | U15 |
| 1 | 74LS04 | DIP-14_W7.62mm | U16 |
| 1 | 74LS138 | DIP-16_W7.62mm | U18 |
| 1 | 74LS244 | DIP-20_W7.62mm | U19 |
| 1 | Conn_01x28 | PinHeader_1x28_P2.54mm_Vertical | J0 |
| 6 | Conn_01x08 | PinHeader_1x08_P2.54mm_Vertical | J1, J2, J3, J4, J5, J6 |
| 1 | USB_B_Micro | USB_Mini-B_Lumberg_2486_01_Horizontal | J7 |
| 1 | Conn_01x03 | PinHeader_1x03_P2.54mm_Vertical | J8 |
| 9 | LED | LED_Rectangular_W5.0mm_H2.0mm | D0, D1, D2, D3, D4, D5, D6, D7 +1 |
| 19 | C | C_Disc_D5.0mm_W2.5mm_P5.00mm | C1, C2, C3, C4, C5, C6, C7, C8 +11 |
| 1 | C | CP_Radial_D5.0mm_P2.00mm | C21 |
| 9 | R | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R0, R1, R2, R3, R4, R5, R6, R7 +1 |
ALU0 design files
The KiCad project lives in the Left-Hand/74-gate-computer repository on GitHub; these links point at the commit this page was built from.
ALU0: common questions
How big is the ALU0 PCB?
The ALU0 measures 100 × 100 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the ALU0?
66 components, from 20 distinct parts. The full bill of materials is listed on this page.
Where can I download the ALU0 design files?
From the Left-Hand/74-gate-computer repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the ALU0 design in my own project?
The repository has no license, so all rights stay with Left-Hand. Use it as a reference, and ask the author before reusing the design.
