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    MIKUL 6809-5 PLC / Furnace controller

    Thank you all for the follow-up. I did a fair bit of work reverse engineering the MIKUL 6809-5 and 6218 on my site. The ones I bought boot right up together and the firmware was usable with the addition of a cheap keypad. The MIKUL 6218 in particular makes a great platform for a high capacity...
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    Why does building something from Github have to be in a "secret" language and needlessly archaic with no real instructions?

    I just checked a repository I have and sure enough, I did not include the JED file, only the equations. Adding it feels like including a binary with the source code. It is completely useless for me to edit or understand. The JED file is just an intermediate file for my purposes. I guess I don't...
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    Why does building something from Github have to be in a "secret" language and needlessly archaic with no real instructions?

    I understand the frustration with using some of these tools, but the project noted here is a pretty complicated one with 3 target systems to program (apple II, raspberry pi, and GAL). It is not for beginners. Expecting the developer to document how to use the 3 tool chains is a bit much...
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    Why does building something from Github have to be in a "secret" language and needlessly archaic with no real instructions?

    I was able to clone it without problem: git clone git@github.com:V2RetroComputing/analog.git cd analog git submodule update --init The project this is based on seems to have very thorough instructions for the components: https://github.com/markadev/AppleII-VGA/blob/main/pico/README.md Maybe...
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    Cleaning old motherboards

    I have put logic boards in the dishwasher on several occasions with no ill effects, and to great benefit. It was very effective at removing leaking capacitor dielectric and get a computer working again before I could do a re-capping. After the dishwasher, I do a quick rinse with isopropyl to...
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    My super minty Intext ICS/Elenco XK-300 M6800 trainer plus some extras

    Hi Stanley! Good idea with the TOC... Here is "Introduction to Microprocessors" by Carl M Glow and Roger M. Kersey, published by National Education Training Corp (same parent company as ICS INTEXT), for comparison:
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    My super minty Intext ICS/Elenco XK-300 M6800 trainer plus some extras

    Book arrived. It is definitely the textbook for the ICS INTEXT course. It goes through a lot of microprocessor basics, and then details of how those apply to the mc6802 and 6802D5. There are just a few hardware/software examples. Unfortunately, amazon raised the price to $20 after I bought my...
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    My super minty Intext ICS/Elenco XK-300 M6800 trainer plus some extras

    I am pretty sure this is the text book for it: https://www.amazon.com/Introduction-to-microprocessors-Electronics-series/dp/093318705X I bought one. I'll let you know how it goes.
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    My super minty Intext ICS/Elenco XK-300 M6800 trainer plus some extras

    I pulled my manual out to see what you were talking about, there are definitely some gaps, which is why I gave the step-by-step.. You have to know how to read an assembly listing at least. And the final instruction to…’press “0” and “GO” to begin execution” would just set the final address to...
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    Dual floppy drive Macs - rare?

    Ohhh, I loved my Mac SE with a bracket that hung the hard drive off the back of the top disk drive. Best of both worlds... or, nonsense, you choose.
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    My super minty Intext ICS/Elenco XK-300 M6800 trainer plus some extras

    Here is a step by step for entering the HELP program on page 3-10: 0 M CE GO 76 GO 79 GO FF GO E4 GO 1D GO CE GO 38 GO 73 GO FF GO E4 GO 1F GO CE GO 40 GO 40 GO FF GO E4 GO 21 GO CE GO F0 GO A2 GO FF GO E4 GO 19 GO 7E GO F0 GO BB GO RST 0 GO
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    My super minty Intext ICS/Elenco XK-300 M6800 trainer plus some extras

    Nice score! The Elenco XK-300 manual is almost identical to the MEK6802D5 manual, as the boards have nearly identical schematics. There are a few test programs in the manual: USE D5, HELP, and TIME that are well documented on the previous page. The rest of the code in the manual is thorough...
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    No Retrochallenge 2022?

    RC2022/10 Halftime update! So many great projects: https://www.retrochallenge.org/2022/10/rc202210-halftime-update.html
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    No Retrochallenge 2022?

    Less than 2 weeks left until we start! Check out the projects so far: https://www.retrochallenge.org/p/entrants-list-202210.html
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    No Retrochallenge 2022?

    We were going have it in January, but why wait?! We are happy to announce RetroChallenge for the month of October 2022! RetroChallenge 2022/10 Theme Categories We have one theme category for this event: Endurance Challenge. This category will be judged and awarded separately from the standard...
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    Why did this Apple II only sell for $710?

    That looks like a late model logic board, maybe even for an apple II+. Also, the power supply is a later one for Apple //e, not the original gold tone. I am not totally sure, but just my initial impressions.
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    Questions about S-100

    Building a backplane bus based Apple II will be difficult because most of the components can't really be separated from the processor and system memory over a single bus. Many parts of the Apple II are designed to work closely together. Take for instance the interleaved access of the system ram...
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    Mystery card/hack..Need help ID'ing!

    That definitely looks like pin 29 ( /NMI ) to me. I think you are maybe skipping the ground finger at the back. INTIN would not generate an interrupt since it is N/C to anything except the INTOUT of the lower card slot, which should be an output.
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    Mystery card/hack..Need help ID'ing!

    No, they were sold pretty widely as the Apple II hobby prototyping board: https://bespin.federalproductions.com/mycloud/Apple%20%5D%5B/Apple%20Computer/A2%20Hobby%20Prototyping%20Board.pdf
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