MemoryAccessRegister
About the MemoryAccessRegister PCB
MemoryAccessRegister is an open source PCB design by Robert-Riordan-UCD, published on GitHub under the CERN-OHL-P-2.0 license. It is a 2-layer board measuring 84.3 × 39.3 mm, with 22 components from 12 distinct parts.
Other key parts include the SN74AC14N, CD74HCT258E and 74LS173. By type, the board carries 9 resistors, 4 ICs, 4 diodes, 3 connectors, 1 switch and 1 capacitor.
It belongs with the dev boards & breakouts designs in this gallery.
From the project
PCB version of Ben Eaters 8-bit breadboard computer
This is my version of Ben Eaters 8-bit breadboard SAP-1 CPU, converted to a PCB. I have made some minor changes as I could not find all of the components as listed in Ben's part list.
1. RAM IC's have been replaced with ATMega328-PU's. This should allow me to have persistant programs between power cycles.
CERN Open Hardware Licence Version 2 - Permissive
Main components on the MemoryAccessRegister
MemoryAccessRegister bill of materials (BOM)
22 components, 12 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | SN74AC14N | 6x_not | U1 |
| 1 | CD74HCT258E | 2_to_1_selector | U2 |
| 1 | ~ | DIP-8 | U3 |
| 1 | 74LS173 | DIP-16_W7.62mm | U4 |
| 1 | Conn_01x05_Pin | PinHeader_1x05_P2.54mm_Vertical | J1 |
| 1 | Conn_01x06_Pin | PinHeader_1x06_P2.54mm_Vertical | J2 |
| 1 | Conn_01x03_Pin | PinHeader_1x03_P2.54mm_Vertical | J3 |
| 1 | SW_SPDT | DoubleThrowSwitch | SW1 |
| 4 | LED | LED_D5.0mm | D1, D2, D3, D4 |
| 1 | 0.1uF | C_Disc_D5.0mm_W2.5mm_P2.50mm | C1 |
| 4 | 220 | CF_series_Resistors_THT | R1, R2, R3, R4 |
| 5 | 1k | CF_series_Resistors_THT | R5, R6, R7, R8, R9 |
MemoryAccessRegister design files
The KiCad project lives in the Robert-Riordan-UCD/8_Bit_CPU_PCB repository on GitHub; these links point at the commit this page was built from.
MemoryAccessRegister: common questions
How big is the MemoryAccessRegister PCB?
The MemoryAccessRegister measures 84.3 × 39.3 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the MemoryAccessRegister?
22 components, from 12 distinct parts. The full bill of materials is listed on this page.
Where can I download the MemoryAccessRegister design files?
From the Robert-Riordan-UCD/8_Bit_CPU_PCB repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the MemoryAccessRegister design in my own project?
Yes, under the terms of its CERN-OHL-P-2.0 license, which Robert-Riordan-UCD chose for the repository.
More boards in 8_Bit_CPU_PCB
Control
144.8 × 73.9 mm64 parts2LCERN-OHL-P-2.00
AVR/ArduinoRAM
133 × 58.5 mm57 parts2LCERN-OHL-P-2.00
Bus
62.2 × 274.1 mm50 parts4LCERN-OHL-P-2.00
ALU
100.4 × 56.8 mm33 parts2LCERN-OHL-P-2.00
ClockModule
81.5 × 52.5 mm30 parts2LCERN-OHL-P-2.00
Registers
89.8 × 50.6 mm27 parts2LCERN-OHL-P-2.00
Output
109.7 × 49.5 mm15 parts2LCERN-OHL-P-2.00
ProgramCounter
58.6 × 38 mm13 parts2LCERN-OHL-P-2.00
Similar boards
88 Pin Vag Breakout
rusefi
142 × 58 mm91 parts2LGPL-3.01.2k
134pin 7-967288-1
139.7 × 73.7 mm38 parts2LGPL-3.01.2k
Breakout 60pin EEC-IV
139.7 × 62.2 mm15 parts2LGPL-3.01.2k
Breakout 112pin Connector
174 × 58 mm39 parts2LGPL-3.01.2k
Eecv breakout
140.8 × 53.7 mm9 parts4LGPL-3.01.2k
Rj45 breakout
rene-dev
15.2 × 53.8 mm3 parts2LGPL-3.0979