Editing IBM System/36 (section)

===Software===

[[File:System-36-ssp-main-menu.png|thumb|300px|System/36 SSP Main Menu]]

{{main|System Support Program}}

The [[System Support Program]] (SSP) was the only [[operating system]] of the S/36. It contained support for multiprogramming, multiple processors, 80 devices, job queues, printer queues, security, [[indexed file]] support, and fully installed, it was about 10MB. On the Advanced/36, the number of workstations/printers was increased to 160. In the Guest/36 environment of certain OS/400 releases, up to 216 devices were supported.

The S/36 could compile and run programs up to 64 kB in size, although most were not this large. This became a bottleneck issue only for the largest screen programs. With the Advanced/36, there were features added to the SSP operating system including the ability to call other programs from within. So a program that was say 60 kB could call another program that was 30kB or 40KB. This call/parm had been available with third-party packages on the System/36 but not widely used until the feature was put in 7.1 and 7.5 of SSP on the Advanced/36.