Siemens Nixdorf acquired the PAS in 1996  but dropped support in 1998. The NPfIT project was claimed to have deployed a total 141 new generation PAS by 2008  but this figure had risen to only 170 by 2010.
In the UK, IRC PAS was developed at North Staffordshire Health Authority in the late 1960s. It became widely used within the NHS and was supported commercially by ICL.