The IBM 3130 is a 30 page-per-minute, cut-sheet, AFP printer. Most companies use an IBM program called Print Services Facility (PSF) to submit AFP print streams to an IBM printer. There are different versions of PSF for different operating systems.
While there are some resident fonts on an IBM 3130 printer, most companies use PSF to make additional fonts available to the printer. When you set up PFS, you install AFP fonts and other resources into PSF. On MVS, the files are copied into PDSs (partitioned data sets). Later, when an AFP print job is submitted to PSF, it looks for the fonts and other resources required by the print stream. PSF downloads fonts and other resources to the printer before converting the AFP print stream into IPDS (Intelligent Printer Data Stream) and sending the IPDS to the printer.
As of this printing, this IBM web address contains documentation on AFP, IPDS, and PSF:
www.s390.ibm.com/bookmgr-cgi/bookmgr.cmd/Shelves/APSBKA20
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