HardLabs

RC202-68000 SIO 1

MarkD833·RCBUS-68xxx·boards/RC202_SIO_Board/RC202-68000_SIO_1.kicad_pcb

RC202-68000 SIO 1 PCB layout, top view — open source board by MarkD833

About the RC202-68000 SIO 1 PCB

RC202-68000 SIO 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 40 components from 20 distinct parts.

Other key parts include the 74LS138, SCC68692C1A44, 74LS125, 74LS688 and 24LC128. By type, the board carries 16 connectors, 7 jumpers, 7 capacitors, 5 ICs, 2 crystals 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.

Image of the RC202 serial I/O board during testing.

The SCC68692 DUART is compatible with MC68681 but supports up to 115200 baud via a test mode. The test mode is documented in the Philips Semiconductors document titled "Extended baud rates for SCN2681, SCN68681, SCC2691, SCC2692, SCC68681 and SCC2698B". I've put a PDF of this document in the board folder.

The 2 serial ports are each fed to a 6-pin connector at the board edge. The layout of the 6 pins is compatible with an FTDI USB-TTL Serial interface board.

RC202-68000 SIO 1, from the project README
From the project README

Main components on the RC202-68000 SIO 1

74LS138SCC68692C1A4474LS12574LS68824LC128

RC202-68000 SIO 1 bill of materials (BOM)

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

QtyPartRefs
1
74LS138
U1
1
SCC68692C1A44
U2
1
74LS125
U3
1
74LS688
U4
1
24LC128
U5
1
3.6864MHZ
3.6864MHz
X1
1
1.0MHZ
1.0MHz
X2
1
RCBUS_80PIN_68000
RCBus_80PIN_68000
J1
1
CONN_02X06_ODD_EVEN
Conn_02x06_Odd_Even
J2
4
CONN_01X06
Conn_01x06
J3, J4, J12, J14
5
CONN_02X02_ODD_EVEN
Conn_02x02_Odd_Even
J5, J9, J10, J15, J16
1
CONN_02X10_ODD_EVEN
Conn_02x10_Odd_Even
J6
2
CONN_01X05
Conn_01x05
J7, J8
1
CONN_01X04
Conn_01x04
J11
1
CONN_02X04_ODD_EVEN
Conn_02x04_Odd_Even
J13
7
SolderJumper
JP1, JP2, JP3, JP4, JP6, JP7, JP8
1
LED
D1
7
100N
100n
C1, C2, C3, C4, C5, C6, C7
1
1K
R1
1
4K7
RN1

RC202-68000 SIO 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.

RC202-68000 SIO 1: common questions

How big is the RC202-68000 SIO 1 PCB?

The RC202-68000 SIO 1 measures 101.6 × 53.3 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the RC202-68000 SIO 1?

40 components, from 20 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 RC202-68000 SIO 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 RC202-68000 SIO 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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