HardLabs

Rosco Hat RAM

rosco-m68k·hardware-projects·RAM-hat-4MB/Rosco_Hat_RAM.kicad_pcb

Rosco Hat RAM layout, top view — open source board by rosco-m68k

About the Rosco Hat RAM

Rosco Hat RAM is an open source PCB design by rosco-m68k, published on GitHub under the MIT license. It is a 4-layer board measuring 92.5 × 58.2 mm, with 21 components from 5 distinct parts.

Other key parts include the 74LS139, IS61C5128AL-10KLI and AS6C4008-55PCN. By type, the board carries 11 ICs, 9 capacitors and 1 connector.

It belongs with the dev boards & breakouts designs in this gallery.

From the project

Supporting hardware, expansions and projects for the rosco_m68k

Copyright (c) 2022 HeathenUK (and Contributors) Licensed under the CERN Open Hardware Licence v1.2 See LICENCE.hardware.txt for details

This is a 4MB SRAM expansion for the rosco_m68k, kindly contributed by HeathenUK. See:

https://discord.com/channels/698525682199822367/711358112904380476/1020396126261743756

The expansion is done as a hat, rather than as a bus expansion, meaning you can use this along with other bus expansions without having a bus board.

Main components on the Rosco Hat RAM

74LS139IS61C5128AL-10KLIAS6C4008-55PCN

Rosco Hat RAM bill of materials (BOM)

21 components, 5 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
74LS139
U1
8
IS61C5128AL-10KLI
U2, U6, U7, U8, U9, U10, U11, U12
2
AS6C4008-55PCN
U3, U4
1
CONN_01X04_MALE
Conn_01x04_Male
J1
9
100NF
100nF
C1, C2, C3, C7, C8, C9, C10, C11 +1

Rosco Hat RAM design files

The KiCad project lives in the rosco-m68k/hardware-projects repository on GitHub; these links point at the commit this page was built from.

Rosco Hat RAM: common questions

How big is the Rosco Hat RAM?

The Rosco Hat RAM measures 92.5 × 58.2 mm, has 4 copper layers and is 4.69 mm thick.

How many components are on the Rosco Hat RAM?

21 components, from 5 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 Rosco Hat RAM design files?

From the rosco-m68k/hardware-projects 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 Rosco Hat RAM design in my own project?

Yes, under the terms of its MIT license, which rosco-m68k chose for the repository.

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