[https://bitsavers.org/pdf/ibm/pc/at/1502494_PC_AT_Technical_Reference_Mar84.pdf IBM PC AT Hardware Technical Reference]
[https://bitsavers.org/pdf/ibm/pc/dos/6172220_DOS_1.0_Jan82.pdf IBM Disk Operating System 1.0 Reference]
[http://en.wikipedia.org/wiki/PC1512 About the Amstrad PC1512]