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Thread: Powertran Cortex

  1. #951

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    Hello everyone,

    Cortex Mk1 owner here, I built the machine when it first appeared. After many years in storage in the attic I tried it this week but unfortunately it no longer fires up.
    My machine is very basic due to lack of funds at the time, it has the cassette interface only.
    Are there any resources that might assist me with fault finding ? I looked through a lot of this thread but it takes a while
    What I've tested so far;

    1. The power supply is all okay
    2. 12MHz clock pulse is okay
    3. continuity of chip pins to PCB are okay

    Currently the BASIC LED is constanlty ON
    The MEM LED flashes once after power is switched on
    IDLE LED is OFF and does nothing
    RUN LED goes OFF when REST button is pressed then comes back on very dim.

    Any help would be very much appreciated.

    Doug.

  2. #952
    Join Date
    Jul 2009
    Location
    Southampton, UK
    Posts
    169

    Default

    Quote Originally Posted by PokePeek View Post
    Hello everyone,

    Cortex Mk1 owner here, I built the machine when it first appeared. After many years in storage in the attic I tried it this week but unfortunately it no longer fires up.
    My machine is very basic due to lack of funds at the time, it has the cassette interface only.
    Are there any resources that might assist me with fault finding ? I looked through a lot of this thread but it takes a while
    What I've tested so far;

    1. The power supply is all okay
    2. 12MHz clock pulse is okay
    3. continuity of chip pins to PCB are okay

    Currently the BASIC LED is constanlty ON
    The MEM LED flashes once after power is switched on
    IDLE LED is OFF and does nothing
    RUN LED goes OFF when REST button is pressed then comes back on very dim.

    Any help would be very much appreciated.

    Doug.
    Hi Doug,

    Do you also go by the name of Thomas, who sent me an e-mail on exactly the same subject? Or has the unseasonably warm weather got two old Cortex owners to drag their machines out of their attics?

    I'd suggest the first step is to test the DRAMs, as they seem to go bad fairly frequently. If you want to send me a PM, I'm happy if you want to post your DRAMs and EPROMs to me for testing in my Cortex, to help isolate the fault.

    Stuart (in the UK)

  3. #953

    Default

    Stuart,

    Many thanks for your message, yes it's the same person, what's the chances of two ?
    I sent you an email because I thought my first post here had failed to pass the "Moderator Test" having taken several days to show up.

    That is a very generous offer to test my chips and I will send you a PM now.

    Many thanks
    Doug.

  4. #954

    Default

    I was wondering what happened to the Cortex crowd... "

    Jack

  5. Default

    Hi folks,
    Just fetched my Cortex out of storage, and to my delight she still boots up just fine.
    I have initial version, with the twon 5.25 disk expansion installed. I've yet to find any of my original disks for it though...
    Anyone out there got any of the expansion boards that were briefly available - e.g. the memory expansion, or maybe a VGA style connector for modern day monitors?
    I'd like to resuscitate this and maybe even build a few add-ons for it.
    Thanks,
    Dawn

  6. #956
    Join Date
    Jun 2009
    Location
    South Florida, USA
    Posts
    132

    Default

    Hi Dawn,

    Glad to hear another Cortex is out there alive and well. Take a look through this thread to find out some interesting history on the Cortex along with hopefully some answers to your questions. More or less all disks have survived and are available in one form or another and it is possible to create disks from your Cortex with the use of a PC and a couple of utilities.

    Most of us on this forum get notified when someone posts something but for some reason or other, new posts can take a few days before this happens.

    All the best,

    Dave.

  7. #957
    Join Date
    Jul 2009
    Location
    Southampton, UK
    Posts
    169

    Default

    Gosh, a new message!

    What Dave said.

    Plus for a VGA style connector, the F18A video board can be used with the Cortex (http://codehackcreate.com/store#!/F1...176/category=0), but they're currently not available pending a new version with an HDMI connector.

  8. #958
    Join Date
    Jul 2009
    Location
    Southampton, UK
    Posts
    169

    Default

    Several years ago I wrote a manual on how to use Dave's WinCortex emulator and the PC<->Cortex transfer utilities. To make a boot floppy and to transfer disk images from the PC to the Cortex, see section 3 of http://www.stuartconner.me.uk/powert...ft%200.01).pdf.

  9. #959
    Join Date
    Jun 2009
    Location
    South Florida, USA
    Posts
    132

    Default

    That's very kind of you Stuart! Been meaning to do that for years...

    I'll have to put Version 2.1 up which is needed for NOS. I'll try and give the manual a read and see if there is anything you can add (e.g clicking a 'floppy drive' can be used in addition to F1-F4, and pressing CTRL while clicking a drive ejects a floppy image).

    Dave.

  10. #960

    Default

    Yes, this thread will give you a lot of useful Cortex data. A lot of the available documentation can also be found here and on the WHT site.
    Enter My Mind At Your Own Risk!

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