Scrumpel8 an 6809 SBC

An 68B09 SBC with 16KB ROM and 32KB RAM, 8 bits I/O and 2 serial ports @ 115200 baud.

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This is a small 68B09 system in two versions: 8a 68B09P, 8b 68B09ES

This computer can run Microsoft BASIC and the Scrumpel monitor originally made for 68HC11 but ported to 6809. 

I also wrote a Forth for it.

Nforth evolves, here the next version:


On request, the scrumpelmonitor sourcecode. I use ASL as crossassembler.

asm - 17.71 kB - 04/09/2021 at 06:14



A game called othello for the 6809 computer. It resides at $3100 and is loadable with the intelhex loader from the monitor. Its startaddress is $3100

hex - 6.58 kB - 03/31/2021 at 17:05



The user manual of the Scrumpelmonitor

Adobe Portable Document Format - 229.30 kB - 02/20/2021 at 09:06


New gerber files using Scrumpel8bV1.1 schematic.

Zip Archive - 146.52 kB - 02/17/2021 at 08:02



The corrected schematic diagram of Scrumpel8b with CPU pin 39 connected in the right way.

Adobe Portable Document Format - 160.30 kB - 02/17/2021 at 05:06


View all 10 files

  • 1 × 68B09P Scrumpel8a CPU
  • 1 × 68B09ES Scrumpel8b CPU
  • 1 × 74HCT73 Scrumpel8b Logic ICs / Flip-Flops, Latches, Registers
  • 13 × Capacitor 100nF Scrumpel8a 12, Scrumpel8b 13 Ceramic Capacitor
  • 2 × Capacitor 15pF Scrumpel 8a Ceramic Capacitor

View all 31 components

View all 2 project logs

  • 1
    ERRATA 68B09SE in Scrumpel8b

    Pin 39 TSC of the 68b09 must be connected to ground via a 4K7 resistor to work properly. In version 1.1 this is solved..

View all instructions

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Nick Brok wrote 04/09/2021 at 06:18 point

On your request I publiced the sourcecode of the Scrumpel monitor program.  Have fun with it. 

  Are you sure? yes | no

Scott wrote 04/08/2021 at 21:12 point

Hi Nick:

Nice work. :)

I'm searching for monitors for my own Grant Searle'ish 6309SBC and SCRUMPEL looks good. Are you planning to release the source code? Or at least a source for the 68HC11 version of it?

Peace and blessings,


  Are you sure? yes | no

Nick Brok wrote 02/17/2021 at 05:01 point

The Forth I made it originally for my 68HC11 from scratch. I ported it for 6809 which was not to difficult. I use the Grand Saerle BASIC . I have the BASIC in ROM plus my Scrumpelmonitor ported from the 68HC11. The Forth runs from $0100 and I load it with my monitor into memory.

  Are you sure? yes | no

Thomas wrote 02/16/2021 at 21:33 point

Nice project :-)

Did you make your Forth from scratch?

Which legacy system was the source for the BASIC?

How do you deal with persistence of programs, both in Forth and in BASIC?   

  Are you sure? yes | no

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