Os9 68k Emulator -mac -macos Dsk Image

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FreeBee - AT&T 3B1 emulator

FreeBee is an emulator for the AT&T 3B1. It's a work-in-progress, but currently works well enough to boot the operating system.

Maintained by

Phil Pemberton -- philpem@philpem.me.uk

Daves Old Computers - Disk/Software Image Archive. Please DO NOT link to any section below this page - It is important that anyone accessing these files view this page first. NOTE: These pages are moved on a regular basis to discourage direct links.

Things which are emulated..

  • Revision P5.1 motherboard with 68010 processor, WD2010 hard drive controller and P5.1 upgrade.
  • 720x348 pixel monochrome bitmapped graphics.
  • 4MB RAM (2MB on the motherboard, 2MB on expansion cards).
    • This is the maximum allowed by the memory mapper.
  • Keyboard and mouse.
  • WD2010 MFM Winchester hard disk controller.
    • Maximum 1400 cylinders (limited by the UNIX OS, see the UNIX PC FAQ, section 5.6).
    • Heads fixed at 8.
    • Sectors per track fixed at 16.
    • Fixed 512 bytes per sector.
  • WD2797 floppy disk controller.
    • Double-sided, 512 bytes per sector, 10 sectors per track, any number of tracks.
  • Realtime clock.
    • Reading the RTC reads the date and time from the host.
    • Year is fixed at 1987 due to Y2K issues in the UNIX PC Kernel.

Things which aren't emulated fully (or at all)

  • Serial ports (or Combo Card)
  • Printer port
  • Modem
    • You will get errors that '/dev/ph0 cannot be opened' and that there was a problem with the modem. Ignore these.
  • Second hard drive (WD2010 driver stores the drive-select state, but doesn't use it)
  • Install the libsdl1.2-dev package
  • Clone a copy of Freebee (remember to check out the submodules too)
  • Build Freebee (run 'make')
  • Download the 3B1 ROMs from Bitsavers: link
  • Download the 3B1 Foundation disk set from Bitsavers: here
    • These will need to be converted from Imagedisk to binary format
    • The disk images on unixpc.org don't work: the boot track is missing.
  • Unzip the ROMs ZIP file and put the ROMs in a directory called roms:
    • Rename 14C 72-00616.bin to 14c.bin.
    • Rename 15C 72-00617.bin to 15c.bin.
  • Create a hard drive image file:
    • dd if=/dev/zero of=hd.img bs=512 count=$(expr 16 * 8 * 1024)
    • This creates a 'Miniscribe 64MB' (CHS 1024:8:16, 512 bytes per sector).
    • Note that you need the Enhanced Diagnostics disk to format 16-head hard drives.
  • Install the operating system
    • Follow the instructions in the 3B1 Software Installation Guide to install UNIX.
    • To change disks:
      • Press F11 to release the disk image.
      • Copy the next disk image as 'discim' in the Freebee directory.
      • Press F11 to load the disk image.
  • After installation has finished (when the login prompt appears):
    • Log in as root
    • cd /etc
    • cp rc rc.old
    • sed 's/.phinit .modeminit//' rc.old > rc
    • reboot
    • The above commands disable the phone and modem initialisation, which crash due to un-emulated hardware.
  • F10 -- Grab/Release mouse cursor
  • F11 -- Load/unload floppy disk
  • Alt-F12 -- exit
  • AT&T 3B1 Information -- the 'Taronga archive'.
    • Includes the STORE, comp.sources.3b1, XINU and a very easy to read HTML version of the 3B1 FAQ.
    • Also includes (under 'Kernel Related') tools to build an Enhanced Diagnostics disk which allows formatting hard drives with more than 8 heads or 1024 cylinders.
  • Bitsavers: documentation and firmware (ROMs), software
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