
8-Bit CPU 32k
slu4coder/Minimal-64x4-Home-Computer
My DIY TTL home computer with VGA and PS/2 and 4x the processing power of a Commodore C64 or Apple II.

ZXMagic F411 is an open-source printed circuit board by sinitsinmike, from the sinitsinmike/ZX-Spectrum repository on GitHub. It is a 2-layer board of 80 × 60 mm with 75 parts on 87 nets, routed with 868 tracks and 70 vias.
It is built around the OPA2134UA, 74HC157D and 74HC86D, with the BAT54C and BAT54A among its other parts. Its parts include 30 resistors, 16 capacitors, 5 diodes, 5 connectors and 3 ICs.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 10k | Resistor_SMD:R_0805_2012Metric | R13, R14, R15, R16, R17, R20, R26 |
| 5 | 0.1u | Capacitor_SMD:C_0805_2012Metric | C6, C12, C13, C15, C18 |
| 4 | 180 | Resistor_SMD:R_0805_2012Metric | R30, R31, R32, R38 |
| 3 | 10u | Capacitor_Tantalum_SMD:CP_EIA-3528-21_Kemet-B | C10, C11, C14 |
| 3 | 22u | Capacitor_Tantalum_SMD:CP_EIA-3528-21_Kemet-B | C7, C8, C9 |
| 3 | 2k | Resistor_SMD:R_0805_2012Metric | R23, R24, R25 |
| 3 | 51 | Resistor_SMD:R_0805_2012Metric | R27, R28, R29 |
| 3 | 91 | Resistor_SMD:R_0805_2012Metric | R33, R34, R35 |
| 3 | Джампер | MyLibrary:Джампер | JP_Left, JP_MID, JP_Right |
| 2 | 220u | Capacitor_Tantalum_SMD:CP_EIA-3528-21_Kemet-B | C1, C2 |
| 2 | 270 | Resistor_SMD:R_0805_2012Metric | R36, R37 |
| 2 | 27k | Resistor_SMD:R_0805_2012Metric | R18, R21 |
| 2 | 33 | Resistor_SMD:R_0805_2012Metric | R5, R6 |
| 2 | 33u | Inductor_SMD:L_0805_2012Metric | L1, L2 |
| 2 | 43k | Resistor_SMD:R_0805_2012Metric | R19, R22 |
| 2 | 47k | Resistor_SMD:R_0805_2012Metric | R1, R2 |
| 2 | 47u | Capacitor_Tantalum_SMD:CP_EIA-3528-21_Kemet-B | C16, C17 |
| 2 | BAT54C | Package_TO_SOT_SMD:SOT-23 | D2, D3 |
| 2 | LED | LED_THT:LED_D3.0mm | D4, D5 |
| 1 | 10u | Capacitor_SMD:C_0805_2012Metric | C5 |
| 1 | 1k | MyLibrary:TRIM_3296W-1-102LF | RV1 |
| 1 | 74HC157 | Package_SO:SO-16_3.9x9.9mm_P1.27mm | U3 |
| 1 | 74HC86 | Package_SO:SO-14_3.9x8.65mm_P1.27mm | U2 |
| 1 | AudioJack3 | Connector_Audio:Jack_3.5mm_CUI_SJ1-3525N_Horizontal | J1 |
| 1 | BAT54A | Package_TO_SOT_SMD:SOT-23 | D1 |
| 1 | Black_Pill F411CEU6 | MyLibrary:PCB-STM32F411 | A1 |
| 1 | Coin 12.5mm 3 V Lithium Battery | MyLibrary:Coin 12.5mm 3 V Lithium Battery | CMOS CR12220 |
| 1 | DIP-8_W7.62mm_Socket | Package_DIP:DIP-8_W7.62mm_Socket | Soket |
| 1 | GamePad (NES) | MyLibrary:Правильный джой | J3 |
| 1 | Micro_SD_Card | MyLibrary:SD Card Holder 112J-TDAR | J5 |
| 1 | Mini-DIN-6 | MyLibrary:PS-2 (Mini Circular DIN 6 pin Connector) | J4 |
| 1 | OPA2134 | Package_DIP:DIP-8_W7.62mm | U1 |
| 1 | SD Card | MyLibrary:SD Card | SD Card |
| 1 | VGA | MyLibrary:D-SUB 15FR (Видео правильный) | J6 |
| 1 | ~ | MyLibrary:Switch SW_TL1105JAF160Q | SW1 |
| 1 | Верхний корпус | MyLibrary:Верхний корпус | Верх |
| 1 | Нижний корпус | MyLibrary:Нижний корпус | Низ |
The 72 most common of 75 parts.

slu4coder/Minimal-64x4-Home-Computer
My DIY TTL home computer with VGA and PS/2 and 4x the processing power of a Commodore C64 or Apple II.

tmarhguy/alu
8-bit combinational ALU built from scratch with 3,488 CMOS transistors (KiCad + SPICE + Logisim + 1.24M tests




otterbox901/8-Bit_CPU
Microcoded 8-bit CPU built from 24 74HC-series ICs: a custom 10-instruction ISA, 4 general-purpose registers, and an EEPROM-driven control unit.

nailed-barnacle/Cisc-8-ttl-processor
A cut-down version of the 8080 processor using HCTTL and including a discrete ALU and instruction decoder

It measures 80 × 60 mm and has 2 copper layers, 1.6 mm thick.
75 parts, built around the OPA2134UA, 74HC157D, 74HC86D and BAT54C. 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.
From the sinitsinmike/ZX-Spectrum repository on GitHub, at the commit this page was made from: the board is ZXMagic F411 Var 2 (correct Led)/ZXMagic F411.kicad_pcb and its schematic ZXMagic F411 Var 2 (correct Led)/ZXMagic F411.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask sinitsinmike before reusing the design.