4 layers65 × 30 mm
2 layers76.2 × 43.2 mm
MaxRAM
fordp2002/MaxRAM2Open Hardware BBC RAM/ROM Board
- Size
- 76.2 × 43.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 16
- Nets
- 59
- Pads
- 178
- Tracks, vias
- 739, 31
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 6 Apr 2017
- Updated
- 7 Jun 2017
Overview
MaxRAM is an open-source printed circuit board by fordp2002, from the fordp2002/MaxRAM repository on GitHub, published under the GPL-2.0 licence. It is a 2-layer board of 76.2 × 43.2 mm with 16 parts on 59 nets, routed with 739 tracks and 31 vias.
It is built around the AS6C4008-55SIN. Its parts include 7 connectors, 4 capacitors and 4 ICs. It belongs with the FPGA and CPLD boards of this library.
Main components
1README
README.mdMaxRAM
Open Hardware BBC RAM/ROM Board
My current thoughts are a board that covers the BBCs 4 sideways ROM sockets and has the following features: 1 4 MBit (512KB) 32 Pin DIP Flash Chip (Socketed) [Microchip Technology SST39SF040-70-4C-PHE] 1 4 Mbit (512KB) SRAM Chip [Alliance Memory, Inc. AS6C4008-55PCN] 1 PLD to handle the logic [ATF1502ASL-25JU44-ND] 1 Simple diode battery backup circuit and battery connector or maybe an IC [DS1210S+TRL-ND] for Battery Backup.
Slot 15 will contain the ROM Manager. 8 Slots will be Write Protected RAM. 8 Slots will be Read Write RAM. 16 pages of Flash will be selected at power on with the ability to switch to 16 pages of RAM after boot.
Parts
16| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | C | Capacitors_SMD:C_0805_HandSoldering | C1, C2, C3, C4 |
| 2 | CONN_01X14 | Pin_Headers:Pin_Header_Straight_1x14_Pitch2.54mm | J1, J6 |
| 2 | GS3 | Connectors:GS3 | J4, J5 |
| 1 | AS6C4008-55SIN | Housings_DIP:DIP-32_W15.24mm_LongPads | U1 |
| 1 | ATF1502PLCC44 | Sockets:PLCC44 | U3 |
| 1 | CONN_01X02 | Pin_Headers:Pin_Header_Straight_1x02_Pitch2.54mm | J7 |
| 1 | CONN_01X08 | Pin_Headers:Pin_Header_Straight_1x08_Pitch2.54mm | J8 |
| 1 | CONN_02X05 | Pin_Headers:Pin_Header_Angled_2x05_Pitch2.54mm | J3 |
| 1 | DS1210 | Housings_DIP:DIP-8_W7.62mm | U4 |
| 1 | LOGO | OPENHARDWARE:OSHWLOGO0.3IN | G*** |
| 1 | SST39SF040 | Housings_DIP:DIP-32_W15.24mm_LongPads | U2 |
Questions
How big is the MaxRAM PCB?
It measures 76.2 × 43.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the MaxRAM use?
16 parts, built around the AS6C4008-55SIN. 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 MaxRAM KiCad files?
From the fordp2002/MaxRAM repository on GitHub, at the commit this page was made from: the board is PCB/MaxRam.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the MaxRAM design in my own project?
Its repository publishes it under the GPL-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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