HardLabs

RC201-68000 CPU 2

MarkD833·RCBUS-68xxx·boards/RC201_68000_CPU_Board/RC201-68000_CPU_2.kicad_pcb

RC201-68000 CPU 2 PCB layout, top view — open source board by MarkD833
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About the RC201-68000 CPU 2 PCB

RC201-68000 CPU 2 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 37 components from 19 distinct parts.

Other key parts include the 74LS04, 74LS148, 74LS20, 74LS139 and 74LS175. By type, the board carries 11 capacitors, 9 ICs, 7 connectors, 5 diodes, 4 resistors and 1 crystal.

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.

Actual image of the processor board under test with IRQ2, IRQ5 and IRQ6 configured for autovectored interrupts and IRQ3 for vectored interrupts.

The processor board is designed to plug into an RCBus-80 backplane and expects to find the stack pointer and initial program counter addresses at location 0x000000 onwards.

There's also a jumper (J4) to allow the processor E clock to be routed onto the RCBus CLOCK2 pin (61) if required. However, note that the CLOCK2 pin may also be used by other boards such as the RC202 serial board (to share its 3.6864MHz UART clock). If this feature is used, then…

RC201-68000 CPU 2, from the project README
From the project README

Main components on the RC201-68000 CPU 2

74LS0474LS14874LS2074LS13974LS17574LS15674LS00

RC201-68000 CPU 2 bill of materials (BOM)

37 components, 19 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
~
U1
1
74LS04
U2
1
74LS148
U3
1
74LS20
U4
1
74LS139
U5
2
74LS175
U6, U8
1
74LS156
U7
1
74LS00
U9
1
7.3728MHZ
7.3728MHz
X1
1
CONN_02X04_ODD_EVEN
Conn_02x04_Odd_Even
J1
1
RCBUS_80PIN_68000
RCBus_80PIN_68000
J2
4
CONN_01X03
Conn_01x03
J3, J5, J6, J7
1
CONN_01X02
Conn_01x02
J4
3
BAT43
D1, D2, D5
2
LED
D3, D4
11
100N
100n
C1, C2, C3, C5, C6, C7, C8, C9 +3
2
1K
R1, R2
1
4K7
RN1
1
10K
RN2

RC201-68000 CPU 2 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.

RC201-68000 CPU 2: common questions

How big is the RC201-68000 CPU 2 PCB?

The RC201-68000 CPU 2 measures 101.6 × 53.3 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the RC201-68000 CPU 2?

37 components, from 19 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 RC201-68000 CPU 2 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 RC201-68000 CPU 2 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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