2 layers90.2 × 99.1 mm
Control logic
codemonkey76/DIY-8-Bit-Computer
DIY 8-Bit Computer, based on the design by Ben Eater
94 parts
2 layers95.3 × 81.3 mm
DIY 8-Bit Computer, based on the design by Ben Eater
- Size
- 95.3 × 81.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 55
- Nets
- 71
- Pads
- 238
- Tracks, vias
- 1,112, 200
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 25 Aug 2019
- Updated
- 25 Aug 2019
Overview
Memory is an open-source printed circuit board by codemonkey76, from the codemonkey76/DIY-8-Bit-Computer repository on GitHub. It is a 2-layer board of 95.3 × 81.3 mm with 55 parts on 71 nets, routed with 1,112 tracks and 200 vias.
It is built around the 74LS245SC, 74LS157PC and 74LS04PC, with the 74LS00SC, A1 and A2 among its other parts. Its parts include 9 resistors, 9 ICs, 8 diodes, 4 connectors and 2 switches. It belongs with the retro computing and games boards of this library.
Main components
774LS245SC
-0℃~+70℃ 12ns@5V,45pF 15mA 24mA 4.75V~5.25V 74LS 8 Bidirectional Output enable Schmitt trigger Tri-State - Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers, Drivers, Receivers, Transceivers
74LS157PC
PDIP-160℃~+70℃ 4.75V~5.25V Single Supply PDIP-16 Signal Switches, Multiplexers, Decoders ROHSTexas InstrumentsSignal Switches, Multiplexers, Decoders
74LS04PC
PDIP-140℃~+70℃ 4.75V~5.25V 6 6.6mA 74LS PDIP-14 InvertersonsemiInverters
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
A1
SOD-123FLDiodes - General PurposeWild GooseA2
SOD-123FL-55℃~+150℃ 1 Independent 1.1V@1A 100V 1A 30A 50uA SOD-123FL Diodes - General Purpose ROHSZhengxinDiodes - General PurposeA3
SOD-123FL-55℃~+150℃ 1 Independent 1.1V@1A 1A 200V 30A 50uA SOD-123FL Diodes - General Purpose ROHSZhengxinDiodes - General Purpose
README
README.mdDIY-8-Bit-Computer
Based off schematics and design of breadboard computer by Ben Eater, available in kit form at: https://eater.net/8bit/kits
Parts
55| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 220R | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1, R2, R3, R4, R5, R6, R7, R8 |
| 8 | LED | LED_THT:LED_D5.0mm | D1, D2, D3, D4, D5, D6, D7, D8 |
| 3 | 74LS157 | Package_DIP:DIP-16_W7.62mm_Socket | U1, U8, U9 |
| 2 | 74LS04 | Package_DIP:DIP-14_W7.62mm_Socket | U3, U5 |
| 2 | 74LS189 | Package_DIP:DIP-16_W7.62mm_Socket | U2, U6 |
| 1 | +5V | TestPoint:TestPoint_Pad_1.5x1.5mm | TP1 |
| 1 | 10nF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C1 |
| 1 | 1K | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R9 |
| 1 | 74LS00 | Package_DIP:DIP-14_W7.62mm_Socket | U4 |
| 1 | 74LS245 | Package_DIP:DIP-20_W7.62mm_Socket | U7 |
| 1 | A_0 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP8 |
| 1 | A_1 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP6 |
| 1 | A_2 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP5 |
| 1 | A_3 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP4 |
| 1 | Address | Connector_JST:JST_PH_S4B-PH-K_1x04_P2.00mm_Horizontal | J3 |
| 1 | BUS_0 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP18 |
| 1 | BUS_1 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP17 |
| 1 | BUS_2 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP16 |
| 1 | BUS_3 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP15 |
| 1 | BUS_4 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP14 |
| 1 | BUS_5 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP13 |
| 1 | BUS_6 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP12 |
| 1 | BUS_7 | TestPoint:TestPoint_Pad_1.5x1.5mm | TP11 |
| 1 | Bus | Connector_JST:JST_PH_S8B-PH-K_1x08_P2.00mm_Horizontal | J4 |
| 1 | CLK | TestPoint:TestPoint_Pad_1.5x1.5mm | TP9 |
| 1 | GND | TestPoint:TestPoint_Pad_1.5x1.5mm | TP3 |
| 1 | Misc | Connector_JST:JST_PH_S4B-PH-K_1x04_P2.00mm_Horizontal | J2 |
| 1 | PROG | TestPoint:TestPoint_Pad_1.5x1.5mm | TP10 |
| 1 | Power | Connector_JST:JST_PH_S2B-PH-K_1x02_P2.00mm_Horizontal | J1 |
| 1 | RI | TestPoint:TestPoint_Pad_1.5x1.5mm | TP7 |
| 1 | SW_DIP_x08 | Button_Switch_THT:SW_DIP_SPSTx08_Slide_9.78x22.5mm_W7.62mm_P2.54mm | SW2 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm_H5mm | SW1 |
| 1 | ~RO~ | TestPoint:TestPoint_Pad_1.5x1.5mm | TP2 |
The 51 most common of 55 parts.
Questions
How big is the Memory PCB?
It measures 95.3 × 81.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Memory use?
55 parts, built around the 74LS245SC, 74LS157PC, 74LS04PC and 74LS00SC. 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 Memory KiCad files?
From the codemonkey76/DIY-8-Bit-Computer repository on GitHub, at the commit this page was made from: the board is Memory/memory.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Memory design in my own project?
Its repository states no licence, so its author keeps all rights: ask codemonkey76 before reusing the design.
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