Callan Multibus 68k computer

I have a long history with the Callan that I will someday add to these notes.

• This project on Github

• Introduction - 2/17/2022
• Conclusion - 5/30/2022

• Read the Roms
• Disassemble the Roms
• Hardware addresses
• Memory (ram)
• Hard drive controller
• Trouble and Joy
• Using the promice with the Callan board
• Hard Drive
• Libgcc
• Multibus DMA
• The evil capacitor
• Using the Prom monitor
• Reverse engineer the CWC (hard drive controller)

• Progress - as of 4/20/2022

• MFM recovery and emulation (stage 1)
• MFM recovery and emulation (stage 2)

Retro computing afficionados may shed a tear, but I long ago discarded the monitor and the gigantic case that housed the Callan. What I am working with now is the card cage along with a good sized switching supply (the original died). Here is a photo of the setup: