Changes
PC
,/* Links */
[https://bitsavers.org/pdf/ibm/pc/pc/6025008_PC_Technical_Reference_Aug81.pdf IBM PC Hardware Technical Reference]
[http://bitsavers.org/pdf/ibm/pc/pc_jr/PCjr_Technical_Reference_Nov83.pdf IBM PCjr Hardware Technical Reference]
[http://www.retroarchive.org/dos/docs/ibm5160techref.pdf IBM PC XT Hardware Technical Reference]
