
The RTI-1221 analog I/O board from Analog Devices was designed specifically for Pro-Log 8080 and 6800 based microprocessor systems (pre STD Bus). The RTI-1220 is a 16-channel data acquisition board while this RTI-1221 is a 4-channel analog output. These were introduced in 1977 with the RTI-1221 priced at $235 Analog Devices also made an RTI-1201
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The RTI-1221 analog I/O board from Analog Devices was designed specifically for Pro-Log 8080 and 6800 based microprocessor systems (pre STD Bus). The RTI-1220 is a 16-channel data acquisition board while this RTI-1221 is a 4-channel analog output. These were introduced in 1977 with the RTI-1221 priced at $235 Analog Devices also made an RTI-1201
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This appears to be an 8080 based single board computer with the following markings PWA: CS23023C PWB:SS23023 C Name: Main CPU 8080 Other: Made in USA

With the SOLOS Personality Module installed, the computer isin the command mode when power is applied to the Sol. Command modeis a sort of “home base” from which excursions may be made into otherprograms. An analysis of three levels of programs will make theconcept of command mode more understandable.

The Interface Board buffers allsignals between the display/controlboard and the ALTAIR 88OOb bus. Italso contains eight parallel datalines which transfer data to the CPUfrom the Display/Control board.

The CPU board controls and processesall instructions and data withinthe ALTAIR 88OOb computer. It-confai ns the Intel Corporation model8O8OA microprocessor circuit, themaster timing circuit, eight inputand eight output data lines to theALTAIR bus control circuits.