The CPS SuperSALT was a system used to test Atari 8-bit computers (400/800/XL) both in a factory setting and for after market repair. The system was composed of a cartridge with the test software and a special test assembly that was build into Atari 850 interface module case. The assembly is needed to completely test the Joystick and SIO ports.
Here are pictures of two different version of the test assembly.
REV O:
The technical reference manual for this device can be found here:
http://www.atarimania.com/documents/CPS_Supersalt_Technical_Users_Manual.pdf
That manual contains schematics that appear to be for the Rev O board since it has a power switch which is absent on Rev C.
There is also an Error Display add on board. In the schematics this is labeled "for future use", but I do have pictures of board, although there are no schematics available for it.
Over my next few posts I will talk about how this device worked.
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