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11907Re: [personal] RE: [midatlanticretro] IMSAI for sale

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  • Mike Hatch
    Mar 3, 2009
    • 0 Attachment
      Can't see much but would guess that either a mistake on the original board
      routing or a slightly different pinout/version of the cpu required the
      daughter board to reroute traces.

      Mike.

      ----- Original Message -----
      From: "Bill Sudbrink" <wh.sudbrink@...>
      To: <midatlanticretro@yahoogroups.com>
      Sent: Monday, March 02, 2009 7:12 PM
      Subject: [personal] RE: [midatlanticretro] IMSAI for sale


      > Ouch! That hurts to look at... the insides don't look too bad though.
      > I wonder why the CPU on the Cromemco ZPU is up on its own little
      > card?
      >
      >> -----Original Message-----
      >> From: midatlanticretro@yahoogroups.com
      >> [mailto:midatlanticretro@yahoogroups.com]On Behalf Of Mike Loewen
      >> Sent: Monday, March 02, 2009 8:02 AM
      >> To: midatlanticretro@yahoogroups.com
      >> Subject: Re: [midatlanticretro] IMSAI for sale
      >>
      >>
      >> On Mon, 2 Mar 2009, B Degnan wrote:
      >>
      >> > A $200 IMSAI 8080 is a super duper bargain
      >>
      >> The case is in rough shape:
      >>
      >> http://sturgeon.css.psu.edu/~mloewen/P1010252.JPG
      >> http://sturgeon.css.psu.edu/~mloewen/P1010253.JPG
      >>
      >> ...but you're right - it's a bargain. I'm going to have to read up
      >> on
      >> re-forming electrolytic caps. Here's some other info he sent me:
      >>
      >> "The boards are:
      >> - Cromenco Z80 CPU board
      >> - Scitronics real-time clock board
      >> -- The BIOS I wrote for CP/M makes use of the clock but I'll be darned
      >> if
      >> I remember how!
      >> -- Probably needs a new battery
      >> - A serial/parallel board
      >> - A serial board that I made (wire-wrapped). It used the 8250 UART which
      >> was
      >> used by the original IBM PC at that time. A write-up of the board's
      >> design
      >> can be found in the June 1984 of
      >> Microsystems (Sol Libes magazine).
      >> - The Morrow Disk Jockey 2D/B.
      >> --The BIOS was modified so that an 8" double density floppy could hold
      >> about 1200KB instead of the standard 800 or 900 KB. When my friend and I
      >> made the change all the nerds that were our friends were amazed and
      >> proclaimed that it was all the storage anybody would ever need. Times
      >> have
      >> changed, right!"
      >>
      >>
      >>
      >> Mike Loewen mloewen@...
      >> Old Technology http://sturgeon.css.psu.edu/~mloewen/Oldtech/
      >>
      >>
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