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Re: [cosmacelf] More MSI-88e Deconstruction

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  • Bill's Old email
    although, I think Mark was kludging the chip into a socket so it could be bad connections. ... From: Bill s Old email To:
    Message 1 of 7 , Jun 13, 2003
      although, I think Mark was kludging the chip into a socket so it could be
      bad connections.
      ----- Original Message -----
      From: "Bill's Old email" <bill.rowe@...>
      To: <cosmacelf@yahoogroups.com>
      Sent: Friday, June 13, 2003 9:35 PM
      Subject: Re: [cosmacelf] More MSI-88e Deconstruction


      > or maybe the two top address bits aren't used and the address lines are
      > oddly mapped?
      >
      > ----- Original Message -----
      > From: "Dave Ruske" <dave@...>
      > To: <cosmacelf@yahoogroups.com>
      > Sent: Friday, June 13, 2003 9:32 PM
      > Subject: Re: [cosmacelf] More MSI-88e Deconstruction
      >
      >
      > > Looks to me like some stuck or bad address lines... offhand, that's
      > > exactly the sort of pattern you'd end up with if address bits 1 and 2
      > > were stuck, I believe.
      > >
      > > Dave
      > >
      > > On Friday, June 13, 2003, at 06:34 PM, Bill's Old email wrote:
      > > > Hi Mark:
      > > > I had a look at the BIN file. The first bit is included below. It
      > > > all looks sort of like this, 4 repetitions of 2 bytes. They are of
      > > > course valid 1802 instructions (hell the 1802 will execute a brick if
      > > > it's got an even number of hex digits!) but they're not too promising.
      > > > How do the 1802 address and data lines map to the ROM? maybe it's
      > > > mixed up or misaddressed.
      > > >
      > > > 000000 8CF48CF4 8CF48CF4 DF00DF00 DF00DF00
      > > > 000010 1DDF1DDF 1DDF1DDF FFBDFFBD FFBDFFBD
      > > > 000020 5EDF5EDF 5EDF5EDF 30DC30DC 30DC30DC
      > > > 000030 30DC30DC 30DC30DC 4EAB4EAB 4EAB4EAB
      > > > 000040 8CF48CF4 8CF48CF4 DF00DF00 DF00DF00
      > > > 000050 1DDF1DDF 1DDF1DDF FFBDFFBD FFBDFFBD
      > > > 000060 5EDF5EDF 5EDF5EDF 30DC30DC 30DC30DC
      > > > 000070 30DC30DC 30DC30DC 4EAB4EAB 4EAB4EAB
      > >
      > >
      > >
      > > ========================================================
      > > Visit the COSMAC ELF website at http://www.cosmacelf.com, or view the
      > Wiki/FAQ at http://1802.bitting.com/
      > >
      > > To unsubscribe from this group, send an email to:
      > > cosmacelf-unsubscribe@yahoogroups.com
      > >
      > >
      > >
      > > Your use of Yahoo! Groups is subject to
      http://docs.yahoo.com/info/terms/
      > >
      > >
      >
      >
      >
      > ========================================================
      > Visit the COSMAC ELF website at http://www.cosmacelf.com, or view the
      Wiki/FAQ at http://1802.bitting.com/
      >
      > To unsubscribe from this group, send an email to:
      > cosmacelf-unsubscribe@yahoogroups.com
      >
      >
      >
      > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
      >
      >
    • Bill's Old email
      Mark: The data lines don t look stuck but could they be scrambled? ... From: Mark Graybill To: Sent:
      Message 2 of 7 , Jun 13, 2003
        Mark: The data lines don't look stuck but could they be scrambled?
        ----- Original Message -----
        From: "Mark Graybill" <saundby@...>
        To: <cosmacelf@yahoogroups.com>
        Sent: Friday, June 13, 2003 10:17 PM
        Subject: Re: [cosmacelf] More MSI-88e Deconstruction


        > Bad connections are possible, and that's what it looked like to me once I
        > got a chance to look at the code. I'm going to do another dump with my
        thumb
        > on top of the chip. ;)
        >
        > -Mark G.
        > ----- Original Message -----
        > From: "Bill's Old email" <bill.rowe@...>
        > To: <cosmacelf@yahoogroups.com>
        > Sent: Friday, June 13, 2003 6:39 PM
        > Subject: Re: [cosmacelf] More MSI-88e Deconstruction
        >
        >
        > > although, I think Mark was kludging the chip into a socket so it could
        be
        > > bad connections.
        > > ----- Original Message -----
        > > From: "Bill's Old email" <bill.rowe@...>
        > > To: <cosmacelf@yahoogroups.com>
        > > Sent: Friday, June 13, 2003 9:35 PM
        > > Subject: Re: [cosmacelf] More MSI-88e Deconstruction
        > >
        > >
        > > > or maybe the two top address bits aren't used and the address lines
        are
        > > > oddly mapped?
        > > >
        > > > ----- Original Message -----
        > > > From: "Dave Ruske" <dave@...>
        > > > To: <cosmacelf@yahoogroups.com>
        > > > Sent: Friday, June 13, 2003 9:32 PM
        > > > Subject: Re: [cosmacelf] More MSI-88e Deconstruction
        > > >
        > > >
        > > > > Looks to me like some stuck or bad address lines... offhand, that's
        > > > > exactly the sort of pattern you'd end up with if address bits 1 and
        2
        > > > > were stuck, I believe.
        > > > >
        > > > > Dave
        > > > >
        > > > > On Friday, June 13, 2003, at 06:34 PM, Bill's Old email wrote:
        > > > > > Hi Mark:
        > > > > > I had a look at the BIN file. The first bit is included below.
        It
        > > > > > all looks sort of like this, 4 repetitions of 2 bytes. They are
        of
        > > > > > course valid 1802 instructions (hell the 1802 will execute a brick
        > if
        > > > > > it's got an even number of hex digits!) but they're not too
        > promising.
        > > > > > How do the 1802 address and data lines map to the ROM? maybe
        it's
        > > > > > mixed up or misaddressed.
        > > > > >
        > > > > > 000000 8CF48CF4 8CF48CF4 DF00DF00 DF00DF00
        > > > > > 000010 1DDF1DDF 1DDF1DDF FFBDFFBD FFBDFFBD
        > > > > > 000020 5EDF5EDF 5EDF5EDF 30DC30DC 30DC30DC
        > > > > > 000030 30DC30DC 30DC30DC 4EAB4EAB 4EAB4EAB
        > > > > > 000040 8CF48CF4 8CF48CF4 DF00DF00 DF00DF00
        > > > > > 000050 1DDF1DDF 1DDF1DDF FFBDFFBD FFBDFFBD
        > > > > > 000060 5EDF5EDF 5EDF5EDF 30DC30DC 30DC30DC
        > > > > > 000070 30DC30DC 30DC30DC 4EAB4EAB 4EAB4EAB
        > > > >
        > > > >
        > > > >
        > > > > ========================================================
        > > > > Visit the COSMAC ELF website at http://www.cosmacelf.com, or view
        the
        > > > Wiki/FAQ at http://1802.bitting.com/
        > > > >
        > > > > To unsubscribe from this group, send an email to:
        > > > > cosmacelf-unsubscribe@yahoogroups.com
        > > > >
        > > > >
        > > > >
        > > > > Your use of Yahoo! Groups is subject to
        > > http://docs.yahoo.com/info/terms/
        > > > >
        > > > >
        > > >
        > > >
        > > >
        > > > ========================================================
        > > > Visit the COSMAC ELF website at http://www.cosmacelf.com, or view the
        > > Wiki/FAQ at http://1802.bitting.com/
        > > >
        > > > To unsubscribe from this group, send an email to:
        > > > cosmacelf-unsubscribe@yahoogroups.com
        > > >
        > > >
        > > >
        > > > Your use of Yahoo! Groups is subject to
        > http://docs.yahoo.com/info/terms/
        > > >
        > > >
        > >
        > >
        > >
        > > ========================================================
        > > Visit the COSMAC ELF website at http://www.cosmacelf.com, or view the
        > Wiki/FAQ at http://1802.bitting.com/
        > >
        > > To unsubscribe from this group, send an email to:
        > > cosmacelf-unsubscribe@yahoogroups.com
        > >
        > >
        > >
        > > Your use of Yahoo! Groups is subject to
        http://docs.yahoo.com/info/terms/
        > >
        > >
        > >
        >
        >
        >
        > ========================================================
        > Visit the COSMAC ELF website at http://www.cosmacelf.com, or view the
        Wiki/FAQ at http://1802.bitting.com/
        >
        > To unsubscribe from this group, send an email to:
        > cosmacelf-unsubscribe@yahoogroups.com
        >
        >
        >
        > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
        >
        >
      • Mark Graybill
        Bad connections are possible, and that s what it looked like to me once I got a chance to look at the code. I m going to do another dump with my thumb on top
        Message 3 of 7 , Jun 13, 2003
          Bad connections are possible, and that's what it looked like to me once I
          got a chance to look at the code. I'm going to do another dump with my thumb
          on top of the chip. ;)

          -Mark G.
          ----- Original Message -----
          From: "Bill's Old email" <bill.rowe@...>
          To: <cosmacelf@yahoogroups.com>
          Sent: Friday, June 13, 2003 6:39 PM
          Subject: Re: [cosmacelf] More MSI-88e Deconstruction


          > although, I think Mark was kludging the chip into a socket so it could be
          > bad connections.
          > ----- Original Message -----
          > From: "Bill's Old email" <bill.rowe@...>
          > To: <cosmacelf@yahoogroups.com>
          > Sent: Friday, June 13, 2003 9:35 PM
          > Subject: Re: [cosmacelf] More MSI-88e Deconstruction
          >
          >
          > > or maybe the two top address bits aren't used and the address lines are
          > > oddly mapped?
          > >
          > > ----- Original Message -----
          > > From: "Dave Ruske" <dave@...>
          > > To: <cosmacelf@yahoogroups.com>
          > > Sent: Friday, June 13, 2003 9:32 PM
          > > Subject: Re: [cosmacelf] More MSI-88e Deconstruction
          > >
          > >
          > > > Looks to me like some stuck or bad address lines... offhand, that's
          > > > exactly the sort of pattern you'd end up with if address bits 1 and 2
          > > > were stuck, I believe.
          > > >
          > > > Dave
          > > >
          > > > On Friday, June 13, 2003, at 06:34 PM, Bill's Old email wrote:
          > > > > Hi Mark:
          > > > > I had a look at the BIN file. The first bit is included below. It
          > > > > all looks sort of like this, 4 repetitions of 2 bytes. They are of
          > > > > course valid 1802 instructions (hell the 1802 will execute a brick
          if
          > > > > it's got an even number of hex digits!) but they're not too
          promising.
          > > > > How do the 1802 address and data lines map to the ROM? maybe it's
          > > > > mixed up or misaddressed.
          > > > >
          > > > > 000000 8CF48CF4 8CF48CF4 DF00DF00 DF00DF00
          > > > > 000010 1DDF1DDF 1DDF1DDF FFBDFFBD FFBDFFBD
          > > > > 000020 5EDF5EDF 5EDF5EDF 30DC30DC 30DC30DC
          > > > > 000030 30DC30DC 30DC30DC 4EAB4EAB 4EAB4EAB
          > > > > 000040 8CF48CF4 8CF48CF4 DF00DF00 DF00DF00
          > > > > 000050 1DDF1DDF 1DDF1DDF FFBDFFBD FFBDFFBD
          > > > > 000060 5EDF5EDF 5EDF5EDF 30DC30DC 30DC30DC
          > > > > 000070 30DC30DC 30DC30DC 4EAB4EAB 4EAB4EAB
          > > >
          > > >
          > > >
          > > > ========================================================
          > > > Visit the COSMAC ELF website at http://www.cosmacelf.com, or view the
          > > Wiki/FAQ at http://1802.bitting.com/
          > > >
          > > > To unsubscribe from this group, send an email to:
          > > > cosmacelf-unsubscribe@yahoogroups.com
          > > >
          > > >
          > > >
          > > > Your use of Yahoo! Groups is subject to
          > http://docs.yahoo.com/info/terms/
          > > >
          > > >
          > >
          > >
          > >
          > > ========================================================
          > > Visit the COSMAC ELF website at http://www.cosmacelf.com, or view the
          > Wiki/FAQ at http://1802.bitting.com/
          > >
          > > To unsubscribe from this group, send an email to:
          > > cosmacelf-unsubscribe@yahoogroups.com
          > >
          > >
          > >
          > > Your use of Yahoo! Groups is subject to
          http://docs.yahoo.com/info/terms/
          > >
          > >
          >
          >
          >
          > ========================================================
          > Visit the COSMAC ELF website at http://www.cosmacelf.com, or view the
          Wiki/FAQ at http://1802.bitting.com/
          >
          > To unsubscribe from this group, send an email to:
          > cosmacelf-unsubscribe@yahoogroups.com
          >
          >
          >
          > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
          >
          >
          >
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