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Any interest in a PCjr CPU upgrade board?

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    #46
    Actually, the BASIC's included with DOS 3.2 are BASIC.COM=19298 and BASICA.COM=36396. They are similar sizes for DOS 2.1. When I run them using the MCL86jr the versions are Dx.x Copyright IBM.

    This is the case when I have no cartridge BASIC installed. If I try to run any BASIC with the cartridge inserted the machine will say that "Cartridge Basic Required"... I will also get this message if I run the MCL86jr in accelerated non-cycle-accurate mode... This is a weird quirk to using the MCL86jr... But it appears that if you run using cycle accurate mode that you can use the BASIC or BASICA which ships with DOS. It would have been nice if the PCjr's cartridge BASIC worked, but it seems that they added checks to make sure it would only work with an unaltered system...

    Regarding running ITT DOS: It is an interesting datapoint to see what works and what does not. Their BASIC actually does seem to be a custom version and has their own banner before the Microsoft copyright information, and Im glad to see that it does seem to work on the MCL86jr...

    Comment


      #47
      The IBM PC DOS 2.x BASIC.COM and BASICA.COM don't run on anything other than IBMs with ROM BASIC; they return immediately to DOS if you run them on other systems. They only contain enough code to implement file and serial routines (missing from the ROM).

      Cartridge BASIC is different, it installs hooks and intercepts DOS trying to run BASIC.COM and goes into Cartridge BASIC instead. You can ask Mike Brutman for details on the hook if you need it.
      Offering a bounty for:
      - A working Sanyo MBC-775 or Logabax 1600
      - Music Construction Set, IBM Music Feature edition (has red sticker on front stating IBM Music Feature)

      Comment


        #48
        D'oh... My PCjr disk controller card no longer works! I must have shocked a component when I was moving the disk drive around... Im using the card from my backup PCjr for now...

        Does anyone have a spare one for purchase/trade? I have a number of ISA cards I could trade... Hercules-long, IBM-B&W/parallel, modems, joystick, 16-bit 1MB memory expansion.. early 384K expansion and a few others...

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          #49
          Final update for this project: https://microcorelabs.wordpress.com/...rator-mcl86jr/

          The MCL86jr can now accelerate the PCjr performance by 7X and beats the IBM PC/XT by 4X. It can also run in cycle-accurate mode which allows the PCjr to amble along at it's usual 4.77Mhz.

          With few exceptions, it appears to run all of the applications and games that would normally run on the PCjr, and when running at top speed can really boost their performance!

          I will be listing the few boards I have on eBay soon with the proceeds going to the American Cancer Society, so keep an eye out!

          Thanks,
          -Ted

          Comment


            #50
            I, for one am interested in getting one of those boards. TurboJr, here i come
            If anyone else is interested, please reply to the thread, so Ted can gauge if there's enough interest for an additional batch.
            Thank you all !

            Comment


              #51
              Originally posted by MicroCoreLabs View Post
              I will be listing the few boards I have on eBay soon with the proceeds going to the American Cancer Society, so keep an eye out!
              If you do plan to build more, i'm interested.

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                #52
                Would love to get one if you make more!

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                  #53
                  Iím definitely interested, as I believe I mentioned, before.

                  - Alex

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                    #54
                    I thought you were going to reach out to us to sell them direct. I had no idea you were posting them on ebay

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                      #55
                      Hi,

                      Thank you for the interest in the MCL86jr! Yes, I sold four of the initial five boards that were made and so far their owners seem to be happy with them!

                      I don't have a solution for mass production and distribution at this point, however 100% of the development files (FPGA and PCB) are available on GutHub for anyone to produce more boards. The total cost for PCBWay to manufacture and assemble five boards was around $250.

                      Here is the GitHub project: https://github.com/MicroCoreLabs/Pro...master/MCL86jr

                      Thanks again!
                      -Ted

                      Comment


                        #56
                        I believe I'd be interested in this project as well. I have zero experience in making PCBs or trying to order them however. If anyone who does know what they are doing decides to organize an order, I'd welcome a head's up and can Paypal my funds upon order. I should probably start learning how to do this as it does seem like a commonly needed skill for this hobby, lol.

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                          #57
                          PCBWay just makes the empty boards or also adds & solders all the components in that price ?
                          Will they also upload the code on the Xilinx so it's ready to plug-n-play ? If not, what tools/JTAG adapter does one needs for that ?
                          I've never ordered anything from a PCB manufacturer and never programmed anything more complicated than an Arduino so i have no idea ...
                          Thanks a lot !

                          Comment


                            #58
                            Originally posted by MicroCoreLabs View Post
                            Hi,

                            Thank you for the interest in the MCL86jr! Yes, I sold four of the initial five boards that were made and so far their owners seem to be happy with them!

                            I don't have a solution for mass production and distribution at this point, however 100% of the development files (FPGA and PCB) are available on GutHub for anyone to produce more boards. The total cost for PCBWay to manufacture and assemble five boards was around $250.

                            Here is the GitHub project: https://github.com/MicroCoreLabs/Pro...master/MCL86jr

                            Thanks again!
                            -Ted
                            Is there any way to split out the PCjr stuff from the other projects? The file is pretty large and I'm not having much luck with getting just the needed files to a PCB maker. Seems they all want a zip file (which your is), but your file has multiple projects inside which I do not want to make. Was going to try OSH Park or PCBWay and see what kind of price they would give me (a newbie) for a few boards. This may be a dumb request, and if it is I apologize in advance as I really don't know much about making PCBs. At all.

                            Comment


                              #59
                              Well, I cannot make heads nor tails of the PCBWay website and can only make the physical boards at OSH Park with no assembly... so I guess i'm out on this. Too bad, as it really sounded interesting.

                              Comment


                                #60
                                If you make more than I am definitely interested.

                                Comment

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