element14 Community
element14 Community
    Register Log In
  • Site
  • Search
  • Log In Register
  • Community Hub
    Community Hub
    • What's New on element14
    • Feedback and Support
    • Benefits of Membership
    • Personal Blogs
    • Members Area
    • Achievement Levels
  • Learn
    Learn
    • Ask an Expert
    • eBooks
    • element14 presents
    • Learning Center
    • Tech Spotlight
    • STEM Academy
    • Webinars, Training and Events
    • Learning Groups
  • Technologies
    Technologies
    • 3D Printing
    • FPGA
    • Industrial Automation
    • Internet of Things
    • Power & Energy
    • Sensors
    • Technology Groups
  • Challenges & Projects
    Challenges & Projects
    • Design Challenges
    • element14 presents Projects
    • Project14
    • Arduino Projects
    • Raspberry Pi Projects
    • Project Groups
  • Products
    Products
    • Arduino
    • Avnet Boards Community
    • Dev Tools
    • Manufacturers
    • Multicomp Pro
    • Product Groups
    • Raspberry Pi
    • RoadTests & Reviews
  • Store
    Store
    • Visit Your Store
    • Choose another store...
      • Europe
      •  Austria (German)
      •  Belgium (Dutch, French)
      •  Bulgaria (Bulgarian)
      •  Czech Republic (Czech)
      •  Denmark (Danish)
      •  Estonia (Estonian)
      •  Finland (Finnish)
      •  France (French)
      •  Germany (German)
      •  Hungary (Hungarian)
      •  Ireland
      •  Israel
      •  Italy (Italian)
      •  Latvia (Latvian)
      •  
      •  Lithuania (Lithuanian)
      •  Netherlands (Dutch)
      •  Norway (Norwegian)
      •  Poland (Polish)
      •  Portugal (Portuguese)
      •  Romania (Romanian)
      •  Russia (Russian)
      •  Slovakia (Slovak)
      •  Slovenia (Slovenian)
      •  Spain (Spanish)
      •  Sweden (Swedish)
      •  Switzerland(German, French)
      •  Turkey (Turkish)
      •  United Kingdom
      • Asia Pacific
      •  Australia
      •  China
      •  Hong Kong
      •  India
      •  Korea (Korean)
      •  Malaysia
      •  New Zealand
      •  Philippines
      •  Singapore
      •  Taiwan
      •  Thailand (Thai)
      • Americas
      •  Brazil (Portuguese)
      •  Canada
      •  Mexico (Spanish)
      •  United States
      Can't find the country/region you're looking for? Visit our export site or find a local distributor.
  • Translate
  • Profile
  • Settings
Personal Blogs
  • Community Hub
  • More
Personal Blogs
Legacy Personal Blogs An 8085 Microcomputer Design (from way back)
  • Blog
  • Documents
  • Mentions
  • Sub-Groups
  • Tags
  • More
  • Cancel
  • New
  • Share
  • More
  • Cancel
Group Actions
  • Group RSS
  • More
  • Cancel
Engagement
  • Author Author: dubbie
  • Date Created: 24 Feb 2020 4:31 PM Date Created
  • Views 1252 views
  • Likes 9 likes
  • Comments 5 comments
  • 8085
  • microcomputer
Related
Recommended

An 8085 Microcomputer Design (from way back)

dubbie
dubbie
24 Feb 2020

I was just doing some tidying up and came across a hand drawn schematic for an 8085 microcomputer that I must have design 30 or 40 years ago. I cannot say exactly when as I do not remember doing it! If it wasn't in my hand writing I would have said it wasn't me.

 

image

 

I don't really remember making this design although it is possible I made this when I first encountered wire-wrap as a method of making prototype boards. I have another diagram showing the chip placements but nothing that shows any PCB layout. I would have remember this PCB layout.

 

How times change, or maybe, how electronics changes.

 

Dubbie

 

PS You might need to expand the picture view if you want to see any of the details.

  • Sign in to reply

Top Comments

  • ccandrews
    ccandrews over 5 years ago +2
    If you want to return to your youth, Here is another 8085 single board computer you can buildthat is not all that different than your original design (except it uses SID/SOD rather than USART) sbc-85.…
  • ccandrews
    ccandrews over 5 years ago in reply to dougw +2
    I Still remember when I first saw the 8085-8755-8156 single board computer system with its PCB layout in the intel MCS-85 user manual. It blew my mind and is still my favorite platform decades later.
  • dougw
    dougw over 5 years ago +1
    Cool. The first complete microcomputer PCB I ever designed was an 8085. They really did a good job with all the peripheral chip pinouts so they could all be easily bussed together.
  • dubbie
    dubbie over 5 years ago in reply to ccandrews

    I used one of the MCS-85s on my degree programme, doing machine code programming (machine code!). I wanted to use one for my final year project of a text output system for physically disabled people, just with two joystick type switches for input (or was it one - it was a long time ago) to select the letters displayed as an array, but the department only had two and they both went to the overseas students who joined in the final year. Instead I ended up implementing the whole system in TTL logic (about 8 boards worth), including making my own text monitor from a portable TV, video sync driver, character font design and everything.

     

    Dubbie

    • Cancel
    • Vote Up +1 Vote Down
    • Sign in to reply
    • More
    • Cancel
  • dubbie
    dubbie over 5 years ago in reply to dougw

    I agree, I really enjoyed using the 8085, a pity I eventually had to move on to the 8088, mostly because it was the basis of the IBM PC. I did also design an 8088 based micro computer but I cannot fin dthe schematic for that, which was done on a CAD system. Not quite the same 'home-made' feel about it.

     

    Dubbie

    • Cancel
    • Vote Up +1 Vote Down
    • Sign in to reply
    • More
    • Cancel
  • ccandrews
    ccandrews over 5 years ago in reply to dougw

    I Still remember when I first saw the 8085-8755-8156 single board computer system with its PCB layout in the intel MCS-85 user manual.  It blew my mind and is still my favorite platform decades later.

    • Cancel
    • Vote Up +2 Vote Down
    • Sign in to reply
    • More
    • Cancel
  • dougw
    dougw over 5 years ago

    Cool.

    The first complete microcomputer PCB I ever designed was an 8085. They really did a good job with all the peripheral chip pinouts so they could all be easily bussed together.

    • Cancel
    • Vote Up +1 Vote Down
    • Sign in to reply
    • More
    • Cancel
  • ccandrews
    ccandrews over 5 years ago

    If you want to return to your youth, Here is another 8085 single board computer you can buildthat is not all that different than your original design (except it uses SID/SOD rather than USART)

     

    sbc-85.com

    • Cancel
    • Vote Up +2 Vote Down
    • Sign in to reply
    • More
    • Cancel
element14 Community

element14 is the first online community specifically for engineers. Connect with your peers and get expert answers to your questions.

  • Members
  • Learn
  • Technologies
  • Challenges & Projects
  • Products
  • Store
  • About Us
  • Feedback & Support
  • FAQs
  • Terms of Use
  • Privacy Policy
  • Legal and Copyright Notices
  • Sitemap
  • Cookies

An Avnet Company © 2025 Premier Farnell Limited. All Rights Reserved.

Premier Farnell Ltd, registered in England and Wales (no 00876412), registered office: Farnell House, Forge Lane, Leeds LS12 2NE.

ICP 备案号 10220084.

Follow element14

  • X
  • Facebook
  • linkedin
  • YouTube