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Thread: Hello from the 68K land

  1. #11

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    Quote Originally Posted by ClassicHasClass View Post
    That, too!

    Mine's still working great. I need to do more with it.
    If you haven't made the fix to the floppy drive you had better do it before the thing self destructs on you.
    Once the head is damaged you will not be able to find an easy replacement.
    Referring to the Canon Cat.
    Dwight

  2. #12
    Join Date
    Dec 2010
    Location
    Seattle, WA
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    1,542

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    Quote Originally Posted by Plasmo View Post
    The 68681 Dual UART already has a 16-bit timer. I program it to generate 100Hz interrupts in the bootstrap monitor.

    Part of the redesign was to add a real time clock. CP/M 68K v1.3 does not need time of day, but other OS do. I stumbled across the 16meg memory because it is cheap and a good fit for 68000 but it does open the door for multitasking OS.
    Oh, I didn't know the 68681 DUART has a built-in timer/counter that can be used. That solves that problem. I briefly used C/OS-II on a Freescale ColdFire CPU. I haven't tried FreeRTOS on anything yet. I wonder if that could work on a tiny system like this. Might be an interesting learning experience.

  3. #13

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    Quote Originally Posted by Dwight Elvey View Post
    If you haven't made the fix to the floppy drive you had better do it before the thing self destructs on you.
    Once the head is damaged you will not be able to find an easy replacement.
    Referring to the Canon Cat.
    Dwight
    What fix??
    I use my C128 because I am an ornery, stubborn, retro grouch. -- Bob Masse
    Machine room: http://www.floodgap.com/etc/machines.html

  4. #14

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    Trust me I'm not trying to be a party pooper, and I see it as entirely admirable to produce an ultra low cost uC. But what do people do with them. Personally my lean is towards small, full featured boards, ala Ampro or even the aforementioned Sega Genesis. That's the shizzle I love.

    But regardless when this project has run it's course, we'll have to bug Bill into designing something with a 68060. Or an fpga with a 68k core. Hello Moto!

  5. #15
    Join Date
    Aug 2017
    Location
    New Mexico, USA
    Posts
    17

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    Quote Originally Posted by 2icebitn View Post
    Trust me I'm not trying to be a party pooper, and I see it as entirely admirable to produce an ultra low cost uC. But what do people do with them. Personally my lean is towards small, full featured boards, ala Ampro or even the aforementioned Sega Genesis. That's the shizzle I love.

    But regardless when this project has run it's course, we'll have to bug Bill into designing something with a 68060. Or an fpga with a 68k core. Hello Moto!
    I quite agree with you. Even if it is CP/M-68K ready at $10, what can I really do with it? CP/M-68K has so few applications. Within the low-cost pcboard form factor (100mm x 100mm), it is entirely reasonable to add an Ethernet and VGA-class graphic chip, so now it is a standalone computer for $10 more, but still constrained by the limited software of CP/M-68K. The next level up is really beyond my headlights (even CP/M 68K is a stretch for me), i.e., Unix/Linux, but it is something I like to learn. My understanding is 68000 may run uCLinux, but not Linux so onward to 68030 which is surprisingly not very expensive anymore, so yet another $10 to a Linux-ready 68030 which may be more usable. I'm just groping in the dark, who know what sticky mess I may bump into along the way.

    I did have a brief flirt with 68060 in the 90's. It was 68060 tightly connected to a FPGA to help me debug hardware and develop software. It never matured past the prototype stage. I don't remember much details after 20+ years. 68060 remains very expensive, I doubt I'll ever work on it again--68040 is plenty good enough.

  6. #16

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    canon-cat-drive.jpg
    Quote Originally Posted by ClassicHasClass View Post
    What fix??
    Hi Bob
    There is a small piece of nylon plastic that is under tension and will fail. It causes the guide rail to come off its mount, for the head assembly. This causes the floppy case to catch against the R/W head. The first tendency is to use a little more force to get the disk out of the drive. This rips the head off the head lever. I don't know anyone that can fix this, since this isn't a common drive.
    In the picture you can see the head assembly has fallen out. On this one, not my drive, the ceramic head was ripped off. If you look in the upper right quadrant, you can see an arc cut as part of the floppy ejector. Right above this arc, you can see a silver colored, philps screw. Under it is the broken nylon end that held the guide rod in place. There was originally a small tab at the left of the screw to hold the rod in place. This is now gone.
    In every drive that I've seen, that hasn't yet failed, I've seen that the tip already has a crack and is about to fail.
    There are several solutions. On mine I made a piece to go under the screw that was not nylon and would not fail over time ( I forget what it was ).
    Another solution is to use a little JB weld to hold the end of the rod down. The only issue with either of these is to make sure that you don't block the end travel of the head carriage.

    On a side note, I have some Forth code that one can enter that will allow you to print to a HP printer with PCL5. Other than Canon printers, the only printer you can use is a FX80 compatible printer, with the selections you have available. The Forth code is saved to the floppy so you only need to entire it once. It will copy to other floppies that you format with a floppy that has the code on it. Of course, you can delete the code and write out to the floppy if you like. I do use one of the Canon printers in the table as it is more difficult to change the count of printers available.
    Dwight
    Last edited by Dwight Elvey; December 5th, 2017 at 11:21 AM.

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