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Stepper Upgrade Kits
GCA manufactured a number of steppers with numbers such as 3696, 4800, 5000, 6000 and 8000 or names such as ALS and AutoStep. The older steppers were built around the DEC PDP-11/04 (UNIBUS backplane) minicomputer and used a 9280 interface chassis between the computer and the stepper. The Master Operating Programs (MOPs) were designated 4.0x (4.02,4.03 etc) or 5.0x (5.02,5.03,etc.) depending on the age.
The newer steppers were built around DEC LSI-11/Micro-11 (QBUS backplane) computers and used a 9289 interface
chassis between the computer and the stepper. The MOPs were designated 5.0x, 605.x or 7.x. The later steppers (MOPs 605.x,7.x)
used the DEC RSX-11M+ operating system as opposed to the simpler proprietary operating systems of the earlier machines.
Upgrade Kit Selection Guide