Changes

PC

114 bytes added, 8 December
/* 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]
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