Motorola EXORmacs Development System

The EXORmacs is a Motorola 68000 based software and hardware development system that first shipped in January of 1980. The backplane that interconnects the boards is VERSAbus, and predecessor to VMEbus. It normally runs the VERSAdos operating system, but can also run CP/M 68k or the SYSTEM V/68 version of UNIX. There were a large number of accessories available for the system for software and hardware development.

The system powers up OK, and displays an error related to not being able to boot because there are no disk drives connected.

The EXORmacs was designed by a team of Motorola engineers led by Jack Kister. John Black joined the development team soon after the EXORmacs was introduced. John found that the VERSAbus documentation was not sufficient to guarantee interoperability between different vendors boards. John rewrote and updated the documentation several times, and was part of the team that developed new VERSAmodules.

VERSAbus was eventually moved to the Euroboard mechanical format using DIN C96 connectors and became the very popular VMEbus.

We need to find out what diskette drives and SMD disk drives will work with this system in order to get VERSAdos running.


Some of the system is alive!

With some switch twiddling we were able to get the onboard Motorola Advanced Computer Systems Debugger running. The MACSbug debugger was also available for the Apple Macintosh.

MACSbug 2.3

PC=00000000 SR=2700=.S7..... US=FFFFFFFF SS=00FEF9A6

D0=00001400 D1=0000FF00 D2=0000FFFF D3=00000000

D4=00FE9800 D5=00000000 D6=00000008 D7=00000041

A0=00FEE011 A1=00FE9856 A2=00FEF854 A3=00FEF9AE

A4=00FE989C A5=00FEFF00 A6=00FEFF00 A7=00FEF9A6