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2 layers83.5 × 66 mmOpen ed Rev.B, the printed circuit board in 3D

Open ed Rev.B

krikzz/open-ed169

Open-ED is a very simple and cheap open source Genesis/Megadrive cartridge. The cartridge does not have its own processor or FPGA, it is built in the old school style using only memory and discrete logic.

Open in PCBKitView on GitHub.kicad_pcb
Size
83.5 × 66 mm
Copper layers
2
Thickness
1.6 mm
Parts
82
Nets
136
Pads
525
Tracks, vias
1,930, 301
Pours
11
Routed
Yes
KiCad
KiCad 6 (file 20211014)
Created
11 Jun 2024
Updated
18 Jun 2024

Overview

Open ed Rev.B is an open-source printed circuit board by krikzz, from the krikzz/open-ed repository on GitHub, published under the MIT licence. It is a 2-layer board of 83.5 × 66 mm with 82 parts on 136 nets, routed with 1,930 tracks and 301 vias.

It is built around the 74LVC162245ADGG:11, M29W064FB70N3E and SN74HC02PWR-TP, with the SN74HC574PWRE4, IS62WV1288BLL-55HLI and SN74HC04PWR-TP among its other parts. Its parts include 27 capacitors, 12 ICs, 11 resistors, 3 connectors and 2 diodes.

Main components

11

README

readme.md

Open-ED

Open-ED is a very simple and cheap open source Genesis/Megadrive cartridge. The cartridge does not have its own processor or FPGA, it is built in the old school style using only memory and discrete logic. Cartridge design uses an absolute minimum of inexpensive components.

Supported mappers:
ROM_4M Most games work in this mode
ROM_2M+RAM Some games with battery ram
ROM_4M+RAM Beyond Oasis, Sonic-3 etc

Content description:
fabrication: pcb gerber files, bill of materials, menu binary
menu: menu sources
pcb_src: pcb sources
schematic: cartridge schematics
flashkit-md.exe: flaskit software v1.0.0.1
open-ed.v: cartridge design in verilog
open-ed-mapper: cartridge mapper description
flashkit_mod.jpg: FlashKit mod required for open-ed programming
open-ed.jpg: cartridge photo

Menu programming
open-ed.md should be burned to the upper bank of flash memory (0x400000-0x40FFFF)
Menu can be programmed to the flash chip using any flash programmer or FlashKit
FlashKit can program menu onboard (flashkit-md v1.0.0.1 required)
FlashKit have to be modified: 10k pullup to the cart pin B27(/VRES)

Open-ED PCB

Parts

82
QtyValueFootprintReferences
23, , , , , , , , , , , , , , , +7
210.1u GCJ188R71H104KA12DSMD0603C_1C1, C2, C12, C13, C14, C15, C16, C17, C18, C19, C20, C22, C23, C24, C25, C26 +5
44.7k AC0603FR-074K7LSMD0603R_1R5, R7, R8, R11
31K AC0603FR-101KLSMD0603R_1R1, R3, R10
34.7u GRT188C71C475KE13DSMD0603C_1C11, C21, C27
374LVC162245ADGGSN74LVTH162245D_1U8, U9, U10
222u GRT188R61A226ME13DSMD0603C_1C9, C10
2SN74HC02PWR74HC02_TSSOP_1U1, U3
2SN74HC574PWR74HC573_TSSOP_1U4, U5
10r AC0603FR-070RLSMD0603R_1R6
1100p GCM1885C2A101JA16DSMD0603C_1C4
13.3v MCP1824T-3302E/OTMCP1824_1U12
133r AC0603FR-0733RLSMD0603R_1R4
1470r AC0603FR-07470RLSMD0603R_1R2
16.2K AC0603FR-076K2LSMD0603R_1R9
1BAT-HLD-001CR2032_THT_1J2
1BAT54C,215SMD_TRANS_1D2
1IS62WV1288BLL-55HLITS0P32_1U7
1M29W064FB70N3EM29W640_1U11
1MMBT2222ALT1GT_MMBT2222_1Q2
1Olimex MICRO-SD-CARDSD_MINI2_1J1
1RED SML-D12U8WT86SMD0603L_1D1
1SI2307CDS-T1-E3MOSFET_SMD_1Q1
1SN74HC04PWR74HC04_TSSOP_1U2
1SN74HC139PWR74HC139_TSSOP_1U6
1xJTAG-ROW_1J3
1xSEGA_CART_BOT_1SEGA2
1xSEGA_CART_TOP_1SEGA1

Questions

How big is the Open ed Rev.B PCB?

It measures 83.5 × 66 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Open ed Rev.B use?

82 parts, built around the 74LVC162245ADGG:11, M29W064FB70N3E, SN74HC02PWR-TP and SN74HC574PWRE4. 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 Open ed Rev.B KiCad files?

From the krikzz/open-ed repository on GitHub, at the commit this page was made from: the board is pcb_src/open-ed-Rev.B.kicad_pcb and its schematic schematic/open-ed_rev.b.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Open ed Rev.B 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).

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