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Cheapo IDE interface for Model 4p running MM CP/M

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    Eh What??? Spinning disk????? I don't think so. Got a challenge for you pearce make a Model I Cheapo IDE adapter! check the link I provided to Matt back on page 1 there is a link to the original design. Near the bottom is a Model 1 variant using a ls85, ls00 & an ls32. Just joking. Board looks nice BTW. And to think the 1st design only had 3 chips and no power input. Adding the Mini-USB is a great idea. Nice work to all involved. That's a virtual pat on the back!

    Wonder how many orders you have so far?
    *FrankG*

    Comment


      Based on that I think we can probably just add a 40-pin header to the design - but what about the model 2 & 3?

      If someone can post links to required header pinouts and timing diagrams I'm happy to work through them. In particular we need to confirm that model 1 (and 2/3) E.I. /IN is /RD OR /IORQ and /OUT is /WR OR /IORW, as with the Model-4 interface (since there appears to be no /IORQ signal).

      Comment


        Originally posted by Chromedome45 View Post
        ok jaquinn I tied pin 11 & 13 on the 688 to VCC and tried the stock driver rshard6 and locked up. Or I am just totally stupid and need to be walked through it!
        If you boot LDOS, and in Basic do:

        ? INP(207)

        What is displayed?

        This is the status register (port 0xCF) for the hard disk.
        Last edited by jaquinn; June 30, 2013, 01:30 AM.
        SBC6120 / PDP11 + VAX / TRS-80 / Kaypro / Northstar / Home Brew Z80 / BBC / Amstrad / Commodore
        http://www.quicktrip.co.nz/jaqblog

        Comment


          I was not serious about the Model 1. It is a different beast altogether! And where as the Model III & 4 are port mapped the Model 1 is memory mapped. I think. Anyone correct this if I am wrong.
          *FrankG*

          Comment


            Originally posted by Chromedome45 View Post
            I was not serious about the Model 1. It is a different beast altogether! And where as the Model III & 4 are port mapped the Model 1 is memory mapped. I think. Anyone correct this if I am wrong.
            You are correct that the Model 1 uses memory mapping for many IO devices but not for the hard disk which still uses IO Mapping on port 0xC0-0xC9.

            Radio Shack sold an adaptor cable 26-1132 for the Model 1 that allows a standard Radio Shack drive to be connected to the Model 1 expansion connector. The main issue purpose of the adaptor is to split the /IN and /OUT signals from the Model 1 expansion port into /IORQ, /RD and /WR which it did with a couple of transistors.

            There are instructions on building your own adaptor cable on Ira's site (http://www.trs-80.com/trs80-zaps-hardware.htm)
            SBC6120 / PDP11 + VAX / TRS-80 / Kaypro / Northstar / Home Brew Z80 / BBC / Amstrad / Commodore
            http://www.quicktrip.co.nz/jaqblog

            Comment


              I'm about to make some of them adaptors to sell on by web site.

              Ian.
              *There is never a charge for Tech Support even if you don't purchase from me - We are Enthusiasts Helping Other Enthusiast and that is just the way it is

              Comment


                Originally posted by TRS-Ian View Post
                I'm about to make some of them adaptors to sell on by web site
                Could you clarify "some of them adaptors"?

                Comment


                  Originally posted by Chromedome45 View Post
                  Eh What??? Spinning disk????? I don't think so
                  My reasoning was that a disk might just do differently for the undefined and depreciated status bits.

                  Originally posted by Chromedome45 View Post
                  ...on page 1 there is a link to the original design. Near the bottom is a Model 1 variant using a ls85, ls00 & an ls32...
                  The pintout is completely different and there's not enough board space to fit on a 40-pin header without a bunch of work and probably some components changes. So IMO the board should stay as it is. It's a nice idea though

                  Any further comments on the board would of course be welcome!

                  Comment


                    Keep like it is. Just MO.
                    *FrankG*

                    Comment


                      Originally posted by pearce_jj View Post
                      Could you clarify "some of them adaptors"?
                      I'm making some of the 26-1132 model 1 hard disk adaptors. Unrelated to FreHD and Cheap-O IDE, they are still needed if people want to connect the traditional Radio Shack MFM hard drives to Model 1 systems. In my capacity to procure, restore and sell Radio Shack MFM hard drives there has been a small but growing number of people after the 26-1132 adaptor.

                      We have tried to use it with the FreHD and it partially works, so we are using this as the basis for further investigations into making FreHD compatible with the Model 1.

                      Ian.
                      *There is never a charge for Tech Support even if you don't purchase from me - We are Enthusiasts Helping Other Enthusiast and that is just the way it is

                      Comment


                        Last call for comments on the PCB design!

                        Comment


                          Did you include switches on the U1 "P" pins for address selection? Otherwise the last link you posted here looks good.
                          SBC6120 / PDP11 + VAX / TRS-80 / Kaypro / Northstar / Home Brew Z80 / BBC / Amstrad / Commodore
                          http://www.quicktrip.co.nz/jaqblog

                          Comment


                            Just a jumper to allow either 4xh or Cxh address matching.

                            Comment


                              Just to post a link to everything in one place: http://www.lo-tech.co.uk/wiki/Lo-tec...80_IDE_Adapter

                              Comment


                                The driver software link to the Zip file doesn't seem to work.

                                I was going to make some of these boards, I can see some uses for it where FreHD is overkill.

                                Is anyone actually in the process of making some boards - if so I'd like to order some - if not I will manufacture them myself in Australia.

                                Ian.
                                *There is never a charge for Tech Support even if you don't purchase from me - We are Enthusiasts Helping Other Enthusiast and that is just the way it is

                                Comment

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