HardLabs

RC107-68000 ROM RAM 1

MarkD833·RCBUS-68xxx·boards/RC107_ROM_RAM_Board/RC107-68000_ROM_RAM_1.kicad_pcb

RC107-68000 ROM RAM 1 PCB layout, top view — open source board by MarkD833

About the RC107-68000 ROM RAM 1 PCB

RC107-68000 ROM RAM 1 is an open source PCB design by MarkD833, published on GitHub under the CC-BY-NC-4.0 license. It is a 4-layer board measuring 101.6 × 53.3 mm, with 28 components from 10 distinct parts.

Other key parts include the 74LS125, 74LS139, SST39SF040, 74LS138 and AS6C4008-55PCN. By type, the board carries 12 connectors, 7 ICs, 7 capacitors and 2 resistors.

It belongs with the retro computing designs in this gallery.

From the project

My Motorola 68000 & 68302 processors (+ SIO, PIO & MFP boards) for the RCBus ecosystem.

Note: If this is the only memory board in the 68000 system, then a pair of FLASH chips should be assigned to /CS0 so that the 68000 finds the stack pointer and program counter on boot.

Note: If this board is used with an MC68302 processor, then see the note further down regarding the ability to remap the ROM & RAM devices.

Note the location of the decoupling capacitors for the memory devices are located within the IC sockets. THese decoupling capacitors should be bent over so that they do not interfere with the insertion of the memory chips.

RC107-68000 ROM RAM 1, from the project README
From the project README

Main components on the RC107-68000 ROM RAM 1

74LS12574LS139SST39SF04074LS138AS6C4008-55PCN

RC107-68000 ROM RAM 1 bill of materials (BOM)

28 components, 10 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
74LS125
U1
1
74LS139
U2
2
SST39SF040
U3, U4
1
74LS138
U5
2
AS6C4008-55PCN
U6, U7
1
RCBUS_80PIN_68000
RCBus_80PIN_68000
J1
8
CONN_01X03
Conn_01x03
J2, J3, J4, J5, J6, J7, J8, J9
3
CONN_01X06
Conn_01x06
J10, J11, J12
7
100N
100n
C1, C2, C3, C4, C5, C6, C7
2
10K
R1, R2

RC107-68000 ROM RAM 1 design files

The KiCad project lives in the MarkD833/RCBUS-68xxx repository on GitHub; these links point at the commit this page was built from.

RC107-68000 ROM RAM 1: common questions

How big is the RC107-68000 ROM RAM 1 PCB?

The RC107-68000 ROM RAM 1 measures 101.6 × 53.3 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the RC107-68000 ROM RAM 1?

28 components, from 10 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 RC107-68000 ROM RAM 1 design files?

From the MarkD833/RCBUS-68xxx 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 RC107-68000 ROM RAM 1 design in my own project?

It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.

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