Diablo Data Systems

Diablo Data Systems was a division of Xerox created by the acquisition of Diablo Systems Inc. for US$29 million in 1972,[1][2] a company which had been founded in 1969 by George E. Comstock, Charles L. Waggoner and others.[3][4]

Metal Daisy Wheel for Xerox & Diablo printers

The company was best known for the HyType I and HyType II typewriter-based computer terminals, the Diablo 630 daisywheel printers,[5] as well as removable hard disk drives that were used in the Xerox Alto computer and resold by DEC as the RK02 and RK03.[6]

Overview
(removable) disk cartridge

The RK02 and RK03 drives that Diablo made for Digital Equipment Corporation (DEC) was described by DEC as "stores digital data in serial format on IBM 2315 type disk cartridges." It differed from what DEC later manufacturered for itself, rather than rebadging as "the RK04 and RK05 use voice coil head positioning, and the RK02 and RK03 use rack and pinion head positioning."[7]:p.1–4

The RK02/RK04 were low density and stored 600K 16-bit words, whereas the RK03/RK05 store 1.2 megabytes of 16-bit words. By using "12 sectors of 128 words (low density) or 256 words (high density)" and "203 cylinders of 2 tracks per cylinder" that was 1.22 megabytes or 2.45 megabytes respectively.[8]

Diablo also made full computer systems as well as printers.[9]

Diablo systems

The Xerox Diablo 3100 was among the complete computing systems sold by Diablo.[10]

Diablo printers

Among the models for which Diablo was known were the 9R87201,[9] the HyType I (1973)[11] and the HyType II. Some of the printwheels were plastic, others were "metalized."[12] Also included were the Diablo 630 and 635.[13]

References
  1. Alexander R. Hammer (March 14, 1972). "Xerox to Acquire Disk-Drive Maker For $28-Million". The New York Times.
  2. Xerox Factbook 2003-2004 Archived 2006-11-16 at the Wayback Machine, p.43
  3. "CI News: Play it again, George?". Computerworld. Computerworld, Inc. XI (47): 64. November 21, 1977. Retrieved June 13, 2017.
  4. Schultz, Brad (October 2, 1978). "Business Mini Weighs 65 Pound - What is Durango?". Computerworld. XII (40). CW Communications, Inc. pp. 1, 4. Retrieved June 13, 2017.
  5. Thom Hogan (March 1984). "Creating a letterhead with your daisywheel printer". Atari Magazine (Creative Computing). Vol. 10 no. 3. p. 202.
  6. "Ken&Den picture". Nokia Bell Labs.
  7. "RK11-C_manual1971.pdf - Bitsavers.org" (PDF). BitSavers. April 3, 2010.
  8. "Early PDP-11 Peripherals".
  9. "Diablo 9R87201 genuine Xerox Printwheel - Daisy Wheel".
  10. CPU, a 10 MB hard disk, and a floppy drive "Xerox Diablo 3100".
  11. "Diablo HyType I, 1973" (PDF).
  12. "Xerox/Diablo Metalized Print Wheel For Printers".
  13. "OSE Xerox Corporation Diablo 635" (PDF).

Further reading
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