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    MOTOROLA MEK6800D1 Assembly Instructions and Schematic

    I uploaded photos of each page of the manual for the MEK6800D1 single board computer. When viewed full size the pages should be quite readable. https://www.flickr.com/photos/93107833@N07/albums/72157688135581564 I operate my MEK6800D1 RS-232 "300 baud" potentiometer setting at 600 baud. It...
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    Revisit of "6800 MORSER" article BYTE Magazine October 1976

    Did anyone here ever try building the Morse Code decoder described in the October 1976 issue of BYTE magazine, by Robert Grappel and Jack Hemenway, entitled "Add This 6800 MORSER to Your Amateur Radio Station"? By July of 1977 I had built and tested the tone detector depicted in the article...
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    1977 Vintage M6800 System Tour and Demonstration

    I watched with interest the MSI 6800 video posted a few days ago by user "falter". It inspired me to remake my video tour and demo of my homebrew MC6800 system that I built around the Motorola MEK6800D1 evaluation kit that I bought in 1975. The video is available here. I have TSC "Space...
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    Using an M6800/MIKBUG Resident Assembler via Tera Term

    In 1977 I bought the resident assembler/editor MP-E, paper tape version, from SWTPC. I needed to resurrect it last summer because I could not find a convenient cross-assembler on internet. I was developing new code for interfacing my AN/FGC-25 teletype set to my 6800 homebrew. Here is a...
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    "Shooting Stars" Game for MC6800/MIKBUG Computers (SWTPC 6800, MEK6800D1, etc.)

    "Shooting Stars" Game for MC6800/MIKBUG Computers (SWTPC 6800, MEK6800D1, etc.) The article in BYTE magazine, May 1976, was for the Intel 8080. I re-wrote the program that same summer, for MC6800, so I could run it in my MEK6800D1 Evaluation Kit single-board computer. I attached a text file of...
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    MEK6800D1 Output Interface for 60mA Teletype Current Loop

    In 1979 I interfaced my MEK6800D1-based microcomputer to a Kleinschmidt AN/FGC-25 Teletypewriter set that I repaired and rebuilt in 1978. Over the past several months, off and on, I got the old teletype set back in operation after having been in basement storage for the past 20 years. The most...
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    512K, Sad Macs 0F000A and 05FFFF

    Hope someone can help regarding one of my Mac 512Ks; When cold, my Mac 512K powers up, boots from disk, and runs perfectly fine for up to a few minutes, then it freezes or Sad Mac 0F000A comes up. After a power off- power on cycle, it comes up immediately with Sad Mac 05FFFF. If I cold start...
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    MEK6800D1 with 8K RAM, Cassette Interface, and Bit Boffer

    I didn't know other folks were interested in keeping alive their old computers from the 70's and 80's until I discovered this forum just recently. This is my first post to this forum. I'm not sure which forum category this should be in, but here goes anyway. Last summer I resurrected my...
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