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KM11 mainboard

fjalvingh·km11·kicad/km1105/km1105.kicad_pcb

KM11 mainboard PCB layout, top view — open source AVR/Arduino board by fjalvingh
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About the KM11 mainboard PCB

KM11 mainboard is an open source AVR/Arduino PCB design by fjalvingh, published on GitHub. It is a 2-layer board measuring 131.8 × 80 mm, with 41 components from 19 distinct parts.

Its main chip is the ATTINY1616-S, from the AVR/Arduino family. Other key parts include the PCF8574T, 74ACT00SC, LD1117S33TR_SOT223 and SN74LVC245APW. By type, the board carries 12 capacitors, 10 ICs, 10 resistors, 5 connectors, 2 diodes and 1 transistor.

It belongs with the displays & leds designs in this gallery.

From the project

PDP-11 KM11 maintenance module, using an LCD screen

This is supposed to become a KM11 maintenance module. It is a 2 slot card which should be placed in both KM11 slots of a PDP 11/05 or 11/10. It uses an ATTINY1616 (or 3216 if I cannot make the code fit) and a set of i2c I/O adapters (PCF8574T) to read the data from both slots for the KM11, and writes those to an LCD screen, offset on a cable.

The main PCB must be placed in the PDP 11/05. The LCD display and the switches sit on a second, small PCB (kicad/kmdisp) at the end of a 20-way ribbon cable, so they can be outside the pdp/11 in the 3D-printed console from 3d/.

KM11 mainboard, from the project README
From the project README

Main components on the KM11 mainboard

ATTINY1616-SPCF8574T74ACT00SCLD1117S33TR_SOT223SN74LVC245APW

KM11 mainboard bill of materials (BOM)

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

QtyPartRefs
1
ATTINY1616-S
ATtiny1616-S
U1
6
PCF8574T
U2, U3, U4, U5, U6, U7
1
74ACT00SC
U8
1
LD1117S33TR_SOT223
U9
1
SN74LVC245APW
U10
1
BC547
Q1
1
CONN-DEC-DOUBLE
J1
1
display_switches_hdr
J2
1
pgm_hdr
J3
1
LA_01
la_01
J4
1
LA_02
la_02
J5
1
JUMPER_2_BRIDGED
Jumper_2_Bridged
JP1
1
PWRLED
D1
1
+3V_LED
D2
9
100NF
100nF
C1, C2, C3, C4, C5, C6, C7, C9 +1
1
100UF
100uF
C8
2
10UF
10uF
C10, C11
2
4.7K
4.7k
R1, R2
8
1K
R4, R5, R6, R7, R8, R9, R10, R11

KM11 mainboard design files

The KiCad project lives in the fjalvingh/km11 repository on GitHub; these links point at the commit this page was built from.

KM11 mainboard: common questions

What microcontroller does the KM11 mainboard use?

The KM11 mainboard is built around the ATTINY1616-S, from the AVR/Arduino family.

How big is the KM11 mainboard PCB?

The KM11 mainboard measures 131.8 × 80 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the KM11 mainboard?

41 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 KM11 mainboard design files?

From the fjalvingh/km11 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 KM11 mainboard design in my own project?

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

Can I test firmware for the KM11 mainboard without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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