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RE: [midatlanticretro] Look what Corey did!

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  • Brian Schenkenberger, VAXman-
    ... Note to Evan -- get a camera! :P -- VAXman- A Bored Certified VMS Kernel Mode Hacker VAXman(at)TMESIS(dot)ORG Well I speak to machines with the voice
    Message 1 of 9 , Jul 17, 2013
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      Evan Koblentz <evan@...> writes:

      >This is one of MARCH's SOL-20 systems:
      >http://www.snarc.net/sol-SI.jpeg
      >
      >Note to myself -- get rid of the whiteboard sitting behind the table....

      Note to Evan -- get a camera! :P

      --
      VAXman- A Bored Certified VMS Kernel Mode Hacker VAXman(at)TMESIS(dot)ORG

      Well I speak to machines with the voice of humanity.
    • Evan Koblentz
      ... Corey sent that picture to me, presumably from his iPhone.
      Message 2 of 9 , Jul 17, 2013
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        > Note to Evan -- get a camera! :P

        Corey sent that picture to me, presumably from his iPhone.
      • corey986
        Yep, from my iPhone 5. Trust me you don t want me dragging out the D3 to take pictures. You ll force Evan to wash the table cloth LOL... Well to give a quick
        Message 3 of 9 , Jul 18, 2013
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          Yep, from my iPhone 5.

          Trust me you don't want me dragging out the D3 to take pictures. You'll force Evan to wash the table cloth LOL...

          Well to give a quick summary of what I did...

          I finally got some time to work on the museum Sol-20 to get the cassette interface up and running. I replaced the smaller 18000uf capacitor in the power supply. When I first started troublshooting I replaced a couple of obviously bad chips that my scope pointed out and then couldn't get the PLL working right. Back in early June, when i started working on it, there seemed to be a lot of noise on the supply. So the cap had to be replaced before I could even move to the next step of troubleshooting.

          Now the supply was clean but I still couldn't get a a successful load...

          So I took my brand new handy dandy Leaper chip tester I just bought and a copy of the schematics and followed the circuit testing each chip. I found a couple of chips that looked ok on the scope but failed when cycled on the tester (I'm sure if I spent more time on it I would have found it with the scope). Swapped them out and now we have a fully working Sol-20. This was a very quick process with the chip tester.

          Next up I need to simply replace a couple of screws and restain the sides of the machine and we are done. I have to be careful with the case. This is the one Lee signed so no repainting is happening.

          Cheers,
          Corey


          --- In midatlanticretro@yahoogroups.com, Evan Koblentz <evan@...> wrote:
          >
          > > Note to Evan -- get a camera! :P
          >
          > Corey sent that picture to me, presumably from his iPhone.
          >
        • B. Degnan
          ... copy of the schematics and followed the circuit testing each chip. I found a couple of chips that looked ok on the scope but failed when cycled on the
          Message 4 of 9 , Jul 18, 2013
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            >
            > So I took my brand new handy dandy Leaper chip tester I just bought and a
            copy of the schematics and followed the circuit testing each chip. I found
            a couple of chips that looked ok on the scope but failed when cycled on the
            tester (I'm sure if I spent more time on it I would have found it with the
            scope). Swapped them out and now we have a fully working Sol-20. This was
            a very quick process with the chip tester.
            >


            Corey,
            Is the Leaper tester able to handle all the TTL chips of the SOL? Not only
            is this a great thing to have, but it would also be a great thing to use to
            learn how to use a scope.
            BIll
          • corey986
            The only chip it didn t handle was the CMOS PLL. But I checked that with a scope anyway since all the discrete components can effect a PLL and even small
            Message 5 of 9 , Jul 18, 2013
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              The only chip it didn't handle was the CMOS PLL. But I checked that with a scope anyway since all the discrete components can effect a PLL and even small variances in the chips performance need allocating for. That's why the sol actually has a calibration procedure when you change the PLL chip. They all behave slightly different, especially older ones when quality control was a little more lax.

              Cheers,
              Corey

              --- In midatlanticretro@yahoogroups.com, "B. Degnan" <billdeg@...> wrote:
              >
              >
              > >
              > > So I took my brand new handy dandy Leaper chip tester I just bought and a
              > copy of the schematics and followed the circuit testing each chip. I found
              > a couple of chips that looked ok on the scope but failed when cycled on the
              > tester (I'm sure if I spent more time on it I would have found it with the
              > scope). Swapped them out and now we have a fully working Sol-20. This was
              > a very quick process with the chip tester.
              > >
              >
              >
              > Corey,
              > Is the Leaper tester able to handle all the TTL chips of the SOL? Not only
              > is this a great thing to have, but it would also be a great thing to use to
              > learn how to use a scope.
              > BIll
              >
            • Mike Loewen
              ... Is this the Leaper-1A? The only two prices I saw were $295 (MCU Mall, out of stock), and $320 (Microcontroller Pros). Mike Loewen
              Message 6 of 9 , Jul 18, 2013
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                On Thu, 18 Jul 2013, B. Degnan wrote:

                >> So I took my brand new handy dandy Leaper chip tester I just bought and a
                > copy of the schematics and followed the circuit testing each chip. I found
                > a couple of chips that looked ok on the scope but failed when cycled on the
                > tester (I'm sure if I spent more time on it I would have found it with the
                > scope). Swapped them out and now we have a fully working Sol-20. This was
                > a very quick process with the chip tester.
                >>
                >
                >
                > Corey,
                > Is the Leaper tester able to handle all the TTL chips of the SOL? Not only
                > is this a great thing to have, but it would also be a great thing to use to
                > learn how to use a scope.

                Is this the Leaper-1A? The only two prices I saw were $295 (MCU Mall,
                out of stock), and $320 (Microcontroller Pros).


                Mike Loewen mloewen@...
                Old Technology http://sturgeon.css.psu.edu/~mloewen/Oldtech/
              • Evan Koblentz
                The movie! http://snarc.net/solspace.mov
                Message 7 of 9 , Jul 18, 2013
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                • corey986
                  Yep. The leaper 1A. Cheers, Corey
                  Message 8 of 9 , Jul 20, 2013
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                    Yep. The leaper 1A.

                    Cheers,
                    Corey

                    --- In midatlanticretro@yahoogroups.com, Mike Loewen <mloewen@...> wrote:
                    >
                    > On Thu, 18 Jul 2013, B. Degnan wrote:
                    >
                    > >> So I took my brand new handy dandy Leaper chip tester I just bought and a
                    > > copy of the schematics and followed the circuit testing each chip. I found
                    > > a couple of chips that looked ok on the scope but failed when cycled on the
                    > > tester (I'm sure if I spent more time on it I would have found it with the
                    > > scope). Swapped them out and now we have a fully working Sol-20. This was
                    > > a very quick process with the chip tester.
                    > >>
                    > >
                    > >
                    > > Corey,
                    > > Is the Leaper tester able to handle all the TTL chips of the SOL? Not only
                    > > is this a great thing to have, but it would also be a great thing to use to
                    > > learn how to use a scope.
                    >
                    > Is this the Leaper-1A? The only two prices I saw were $295 (MCU Mall,
                    > out of stock), and $320 (Microcontroller Pros).
                    >
                    >
                    > Mike Loewen mloewen@...
                    > Old Technology http://sturgeon.css.psu.edu/~mloewen/Oldtech/
                    >
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