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Powertran Cortex

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    Originally posted by nige the hippy View Post
    it just sits there being dead with the "Basic" light lit, and the "Run" light glowing dully
    Was the buzzer going as well Nige, out of interest?

    Stuart.

    Comment


      Not sure, the buzzer seems a bit intermittent anyway (i.e. I haven't heard it definitely doing "anything")
      "Don't it always seem to go
      That you don't know what you’ve got ‘til it’s gone" (BANG )

      Comment


        Fantastic news Nige, -- this could possibly be a glimmer of light at the end of the tunnel !!!

        I'll look out for the delivery and keep you posted - Many Thanks

        Comment


          Quite likely an oncoming train! Don't get excited 'till it's fixed.
          "Don't it always seem to go
          That you don't know what you’ve got ‘til it’s gone" (BANG )

          Comment


            A positive update for a change!

            Nige, I received your DRAM chips today and tried 8 of them together with the Forth Eproms. This gave me the Forth screen prompt and I actually ran a quick forth test routine for the first time in 20 years!
            I then re-fiited the originals, one at a time and found to my suprise that 5 of my 4164s were faulty.
            I then installed the new Basic Eproms and got the original problem with the same LED sequence and the continual tone.
            So Stuart, it looks like you were spot on with your prediction.

            I then dug out my original Basic eproms (Couldn't remember which one was faulty - Thought it was IC45) and tried different combinations of new and old eproms but stiil had the same fault.

            But a great leap foward and my system is now working on Forth thanks to all of you.

            So to the next step -

            Where can I get some 4164s or MCM6665s or equivalents and where would be the best place to look - or Nige, can I buy 5 off you.

            Also if I post the new basic eproms back to you together with my originals, would you mind testing them on your system for me.

            One last question, the new Eproms were labelled

            Cortex 1 EB84
            Cortex 2 149E
            Cortex 3 72EB

            and I put them in sockets 47, 46, 45 respectively, as instructed but what are the hex digits, are they eprom checksums or do they refer to a memory map?

            Comment


              Good news so far, it is a bit like pulling teeth though.
              1) the 6665s were yours anyway, I had a fair size pot full, now (with a little shaking) I can fit them all into the same "racco drawer"
              2) now I know my basic eproms work, I can get some known good images sorted.
              3) I'm expecting some TMS2532s for myself through the post any day now, Provided they aren't counterfeit, I could blow another 3 basic roms (to the good images), test them, then send them down. Just send me back your spares when you've finished.
              4) the hex numbers are checksums.
              "Don't it always seem to go
              That you don't know what you’ve got ‘til it’s gone" (BANG )

              Comment


                Nige - Thanks very much for the RAM chips.
                I'll send you my 3 eproms in the post today and then you can decide which ones to use.

                Comment


                  Originally posted by andyp View Post
                  This gave me the Forth screen prompt and I actually ran a quick forth test routine for the first time in 20 years!
                  Good news indeed.

                  Stuart.

                  Comment


                    Doh! 2532s aren't 2564s! so yes, good job you sent the basic eproms back.
                    Full of cold, but I've just had some "Lem-Sip", & will pop upstairs & have a go in a few minutes.
                    "Don't it always seem to go
                    That you don't know what you’ve got ‘til it’s gone" (BANG )

                    Comment


                      Originally posted by nige the hippy View Post
                      Doh! 2532s aren't 2564s! so yes, good job you sent the basic eproms back.
                      Full of cold, but I've just had some "Lem-Sip", & will pop upstairs & have a go in a few minutes.
                      Are you still with us Nige, or have you overdosed on the Lem-Sip?

                      Comment


                        Don't worry I am still with you. In order to test the eproms I can't get the safeblock in, which means I'm having to redo the mains bits, using components which are slightly buried. It's taking a bit longer than it should.
                        "Don't it always seem to go
                        That you don't know what you’ve got ‘til it’s gone" (BANG )

                        Comment


                          FINALLY! got the mains bits replaced on my cortex. I was a bit fed up that the hole in the back of the metalwork isn't exactly the right size for an IEC inlet so must be for a long-obsolete switch. I've put an IEC on it, and have to order a little latching push-button to go in the old mains lead hole. It's not too bad a codge, and I hate trailing mains leads.
                          I've just lifted the roms, slightly awkward, as there are caps and a case in the way. Checked them against Andy's and there's one byte completely wrong in IC47. Erased & reprogrammed.
                          Andy - I'll pop them in the post tonight, they should go first thing tomorrow morning, and if you're really lucky you'll get them before Easter.

                          Edit - the lack of vertical sync appears to be down to the TV! I've just tried it on my relic Philips Discoverer, and it's solid as a rock. (?...)
                          "Don't it always seem to go
                          That you don't know what you’ve got ‘til it’s gone" (BANG )

                          Comment


                            Thanks Nige,

                            I'll let you know how I get on.
                            I've ordered some new electrolytics to replace the 30 year old capacitors in my power supply, so they should all arrive together.

                            Comment


                              Better add these to the whtech archive...
                              Attached Files
                              "Don't it always seem to go
                              That you don't know what you’ve got ‘til it’s gone" (BANG )

                              Comment


                                Nige, Received the Eproms this morning, plugged them in and **** SUCCESS *** a basic prompt appeared on the screen and no irritating tone from the speaker!
                                Thanks to all your hard work and patience, I now have a working Cortex.
                                Over the years it has come very close to ending up on the tip. I certainly would never have put money on it ever being coaxed back to life.
                                Also many thanks to Stuart for his fault finding tips and guidance.

                                Next stage, after replacing the electrolytics, is to load on the 2 games I have and then save them as WAV / MP3 so you can all have a copy.

                                Comment

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