Making a homemade 6802 computer for fun.

I am going to use an AMI S6802P (Motorola 6802 Clone) and make a computer around it.

Similar projects worth following
At the moment I am trying to figure out how everything works and I have seen some people use the 6800 (mostly 6809) series processors but not a lot of information otherwise. Schematics and such. I did find an awesome site that I will add as a kind of shout out thank you. Having some background info on the 6802 is better than none.

I have made a Pinterest to list all of the components I own. (I had a toolbox full). A lot of them have no datasheets and it would be really great to find out the info of everything. I still have to make edits and add the rest of the components and fix the info on the components I have datasheets for. Any help would be much appreciated.

- Jeff

  • 1 × AMI S6802P Microcontroller running at 1MHz and 128 bytes incuding 32 standby bytes of RAM.
  • 1 × Hitachi HD46821P Peripheral interface adapter.
  • 1 × MOS 6560-101 Also known as the VIC-20. This is the NTSC version.
  • 1 × SGS-THOMSON 27C64A 64K (8K x 8) CMOS EPROM
  • 1 × Motorola MC6845P CRT CONTROLLER (CRTC)

View all 12 components

  • Learning about the Motorola 6800. "sixty-eight hundred"

    Jeffrey Paull02/07/2016 at 04:46 0 comments

    I have been reading about the 6800 series microprocessor. So far I have learned a lot. I would like to learn more but lately been running out of time for my projects. I have a side project not posted that has took some of my time. The rest of my time has been going to my recent marriage. :)

    This picture is from Amazon where I got the book even though this isn't what the book I got looks like. I will upload a picture of my book sometime later. :)

  • Just keep planning

    Jeffrey Paull06/03/2015 at 18:54 0 comments

    I need more stuff if I am going to use the MOS 6560 chip for video. The 6502 isn't far off from the 6800 series chips if what I am remembering is correct. I believe there was a whole court case from Motorola to MOS because they were selling the 6502 CPU that is compatible with 6800 series for $25 instead of Motorola's $100+ and Intel's $100+ CPU.

    The 6502 is on the top left and the 6560 is on the middle right.

    I am assuming I need the 3 Octal Bus Transmitter/Receivers at this time.

  • VIC-20 Update

    Jeffrey Paull06/01/2015 at 10:32 0 comments

    I am going to try and use the Commodore VIC-20 chip for video on the 6802 Build. Mostly because I have no other chip that can do what this can do.

  • Eagle Cad

    Jeffrey Paull06/01/2015 at 06:41 0 comments

    My latest update is that I am making a new schematic on Eagle Cad. My only problem was I had to learn how to use Eagle Cad. I didn't find that being a problem for long as I watch a lot of Ben Heck YouTube shows. His show on Eagle Cad was right to the point.

    Next step will be ordering a custom PCB after I finish with Eagle Cad.

    In other news I found out from a lot of reading of datasheets that the 64k EPROM (27C64A) I have can work. That is also the max the 6802 can use. I will save the 32k for another day. Maybe on a Z80 build if this works out alright.

View all 4 project logs

  • 1
    Step 1

    I am going to base my project around a schematic that I know works. This is from the site I mentioned.

View all instructions

Enjoy this project?



Jacob Christ wrote 05/01/2020 at 17:09 point

How is your project going?  I'm looking for some open source schematics for a 6800 system to use for a historical perspective for my embedded systems class.  I cut my teeth with the 6800 30 years ago if you need help with anything.

  Are you sure? yes | no

Dylan Brophy wrote 01/12/2016 at 03:46 point

If you haven't heard of , its a good blog to help. I have learned a lot from this blog and though it does not use the 6800/6809, it can e of use. Look into the Veronica project.

  Are you sure? yes | no

Jeffrey Paull wrote 02/07/2016 at 04:36 point

Currently I have been reading "6800 Assembly Language Programming - 1978" and so far I have learned a lot but not as much as I would like. Edit: Just checked out the site. Looks like I have more stuff to read. :)

  Are you sure? yes | no

Xark wrote 06/01/2015 at 08:32 point

Hmm, I had to read that part number three times...yes "6802".  You are correct not many 6802 projects out there (that I've seen). :-)  I gather kind of like an embedable flavor of 6800 (with RC and built in RAM).  Looks like a fun project.

  Are you sure? yes | no

Jeffrey Paull wrote 06/01/2015 at 10:23 point

I hope it is a fun project. :) I contacted Ben Heck in an email from his
site and he said it was an obscure chip. It was only one of 4 MCUs I
own that I could use. The other 4 are; NEC D7810HG (Z81 Clone), Philips
PCBC80C31BH (Intel 8501 Clone), Hitachi HD404729S (4-Bit Custom MCU),
and Sanyo LM6402G (4-Bit Custom MCU). The 6802 is a really cool chip that was
used in a lot of old pinball machines.

  Are you sure? yes | no

Similar Projects

Does this project spark your interest?

Become a member to follow this project and never miss any updates