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Much of the software was in a language called HAL/S (High-order Assembly Language/Shuttle), using an IBM 360/370 for compilation. Other software was written in Fortran. See https://www.cs.toronto.edu/XPL/hal.html and https://repository.arizona.edu/bitstream/handle/10150/613923...

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Interesting... I know about HAL/S being used for the AP-101S Shuttle software, inter alia. I didn't realise it was used for the CII Mitra 125 as well. I would have assumed the Europeans would have used something else.

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