HardLabs

SegaCD Ramcart

WindDrake·SegaCD_Ramcart

SegaCD Ramcart PCB layout, top view — open source board by WindDrake

About the SegaCD Ramcart PCB

SegaCD Ramcart is an open source PCB design by WindDrake, published on GitHub. It is a 2-layer board measuring 83.8 × 61.5 mm, with 20 components from 13 distinct parts.

Other key parts include the 74LS30, CY62148ELL-55SXI, 74LS138, 74LS32 and 74LS74. By type, the board carries 8 capacitors, 7 ICs, 2 resistors, 1 connector, 1 battery holder and 1 diode.

It belongs with the retro computing designs in this gallery.

From the project

Sega Genesis/Megadrive CD Back-up RAM Cart

Design done in Kicad 5.1.10 with Digikey libraries. If you want to edit it, you'll need those libraries as well as these files.

Board tested working 9/3/21 after fixing A20/A22 accidental swap @ U4.

PCB revision 1.1 has this fixed. PCB revision 1.2 adds R2 to make sure the SRAM goes into sleep mode. The BOM has also changed.

RAM Cart tested 9/3 with Dark Wizard and does not have the save corruption issue that the Castlemania Ultra cart has.

Main components on the SegaCD Ramcart

74LS30CY62148ELL-55SXI74LS13874LS3274LS7474LS245

SegaCD Ramcart bill of materials (BOM)

20 components, 13 distinct parts — part numbers from the project's BOM.

QtyPartRefs
2
74LS30
U1, U3
1
CY62148ELL-55SXI
IS61C5128AS-25QLI
U2
1
74LS138
U4
1
74LS32
U5
1
74LS74
U6
1
74LS245
U7
1
Genesis_Edge_Connector
J1
1
Battery_Cell
BT1
1
SDM40E20LC-7
MMBD1204
D1
7
0.1UF
0.1uF
C1, C2, C3, C4, C5, C6, C7
1
22uF 25v
C8
1
10K
1K
R1
1
10K
10k
R2

SegaCD Ramcart design files

The KiCad project lives in the WindDrake/SegaCD_Ramcart repository on GitHub; these links point at the commit this page was built from.

SegaCD Ramcart: common questions

How big is the SegaCD Ramcart PCB?

The SegaCD Ramcart measures 83.8 × 61.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the SegaCD Ramcart?

20 components, from 13 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the SegaCD Ramcart design files?

From the WindDrake/SegaCD_Ramcart repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the SegaCD Ramcart design in my own project?

The repository has no license, so all rights stay with WindDrake. Use it as a reference, and ask the author before reusing the design.

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