2 layers142.2 × 99.1 mm
2 layers84.8 × 61.2 mm
SimpleRamFlashCartridge
CyberspiceHardware/SimpleRamFlashCartridge3A simple ROM RAM Flash cartridge for the BBC Master or Acorn Electron
- Size
- 84.8 × 61.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 9
- Nets
- 49
- Pads
- 101
- Tracks, vias
- 313, 17
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 26 Jan 2022
- Updated
- 29 Jan 2022
Overview
SimpleRamFlashCartridge is an open-source printed circuit board by CyberspiceHardware, from the CyberspiceHardware/SimpleRamFlashCartridge repository on GitHub, published under the MIT licence. It is a 2-layer board of 84.8 × 61.2 mm with 9 parts on 49 nets, routed with 313 tracks and 17 vias.
It is built around the 27C256-17/J and 74HC00D. Its parts include 4 connectors, 2 capacitors, 2 ICs and 1 resistor. It belongs with the retro computing and games boards of this library.
Main components
227C256-17/J
-0℃~+70℃ 256Kbit 4.5V~5.5V EPROM Parallel Port (Parallel) - Non-Volatile Memory (ROM)Microchip TechnologyNon-Volatile Memory (ROM)
74HC00D
SOP-14-40℃~+125℃ 1.5V、3.15V、4.2V 1.9V、3.7V、5.9V 100mV、400mV、400mV 2 2V~6V 4 40uA 5.2mA 5.2mA 500mV~1.8V 74HC Series 7ns@6V,50pF NAND Gate SOIC-14 Logic Gates ROHSNexperiaLogic Gates
README
README.mdSimple Ram Flash Cartridge
This is a simple ROM/RAM/Flash cartridge for a BBC Master or Acorn Electron.
It takes a single 32K memory device. For example an AS6C62256 or a AT28C256.
Jumpers / Links
There are three jumpers
J2 - This selects whether the cartridge is for the Master or Electron. It selects the R/WR source from the edge connector. J3 - This selects whether pin 27 is A14 or nWE. It is typically A14 for (E(P))ROM but nWE for SRAM or Flash. J4 - This selects whether pin 1 is A14 or 5V. It is typically A14 for SRAM or Flash and 5V (VPP) for (E(P))ROM
You may omit J3 if you want to use a 27C128 EPROM chip where pin 27 is the nPGM pin.
Parts
9| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | R/R | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J3, J4 |
| 1 | 100nF | Capacitor_THT:C_Disc_D7.5mm_W2.5mm_P5.00mm | C1 |
| 1 | 10uF | Capacitor_THT:CP_Radial_D5.0mm_P2.50mm | C2 |
| 1 | 27C256 | Package_DIP:DIP-28_W15.24mm_Socket | U2 |
| 1 | 4K7 | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P7.62mm_Horizontal | R1 |
| 1 | 74HC00 | Package_DIP:DIP-14_W7.62mm_Socket | U1 |
| 1 | Cartridge | Cyberspice:ElectronCartridgeEdge | CON1 |
| 1 | M/E | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J2 |
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Questions
How big is the SimpleRamFlashCartridge PCB?
It measures 84.8 × 61.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SimpleRamFlashCartridge use?
9 parts, built around the 27C256-17/J and 74HC00D. 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 SimpleRamFlashCartridge KiCad files?
From the CyberspiceHardware/SimpleRamFlashCartridge repository on GitHub, at the commit this page was made from: the board is KiCad/SimpleRamFlashCartridge.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the SimpleRamFlashCartridge 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).