Editing Sirius Systems Technology (section)

== References ==
{{Reflist|refs=
<ref name="Sargent_1988">{{cite book |title=Assemblersprache und Hardware des IBM PC/XT/AT |language=German  |author-first1=Murray |author-last1=Sargent III. |author-first2=Richard L. |author-last2=Shoemaker |author-first3=Ernst H. K. |author-last3=Stelzer |publisher=[[Addison-Wesley Verlag (Deutschland) GmbH]] / [[Addison-Wesley Publishing Company]] |edition=1 |date=1988 |isbn=3-89319-110-0 |id=VVA-Nr. 563-00110-4}}</ref>
<ref name="Victor_1983_Technical_Reference">{{cite web |title=Supplemental Technical Reference Material |id=Application Note: 002 |publisher=[[Victor Publications]] |location=Scotts Valley, CA, USA |date=1983-03-23 |edition=1st printing |version=Revision 0 |url=https://archive.org/stream/bitsavers_victorvict83_1876736/appNote002_Mar83#page/n0/mode/1up |quote=[…] Single-sided floppy drive offers 80&nbsp;tracks at [[96&nbsp;tpi|96 TPI]] […] Double-sided floppy drive offers 160 tracks at 96&nbsp;TPI […] Floppy drives have 512&nbsp;byte sectors; utilising a GCR, 10-bit recording technique. […] Although the Victor 9000 uses 5&nbsp;1/4-inch minifloppies of a similar type to those used in other computers, the floppy disks themselves are not readable on other machines, nor can the Victor 9000 read a disk from another manufacturers machine. The Victor 9000 uses a unique recording method to allow the data to be packed as densely as 600&nbsp;kbytes on a single-sided single-density minifloppy; this recording method involves the regulation of the speed at which the floppy rotates, explaining the fact that the noise from the drive sometimes changes frequency.}}</ref>
<ref name="Victor_1982_Technical_Reference">{{cite book |title=Victor 9000 Technical Reference Manual |chapter=Chapter 7. Disk Drive Assembly |date=June 1982 |publisher=[[Victor Business Products, Inc.]] |id=710620 |pages=7–1..7–9 |url=https://www.mirrorservice.org/sites/www.bitsavers.org/pdf/victor/victor9000/Victor9000TechRef_Jun82.pdf |access-date=2017-03-23 |url-status=live |archive-url=https://web.archive.org/web/20170323232847/https://www.mirrorservice.org/sites/www.bitsavers.org/pdf/victor/victor9000/Victor9000TechRef_Jun82.pdf |archive-date=2017-03-23 |quote=[…] Track density is 96 tracks per inch, and recording density is maintained at approximately 8000 bits per inch on all tracks. […] The VICTOR 9000 uses an encoding technique called group code recording (GCR) to convert the data from internal representation to an acceptable form. GCR converts each (4-bit) nibble into a 5-bit code that guarantees a recording pattern that never has more than two zeros together. Then data is recorded on the disk by causing a flux reversal for each "one" bit and no flux reversal for each "zero" bit. […]}}</ref>
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