|Manufacturer||Durango Systems Corp.|
|Type||Personal business computer|
|Media||two 100 tpi high-capacity 5.25-inch diskette drives storing 480 KB on each single-sided diskette using group-coded recording (GCR}|
|CPU||5 MHz Intel 8085A|
|Memory||65 KB (up to 196 KB)|
|Storage||40 MB Shugart SA-4006 14-inch winchester|
|Display||9-inch CRT with 64 characters per row by 16 rows or 80 characters per row by 24, based on the Intel 8275 Video display controller|
|Input||keyboard, full stroke, 84 key|
The Durango F-85 was an early personal computer introduced in 1977 by Durango Systems Corporation. It could run its own multitasking operating system called DX-85M, which included an integral Indexed Sequential (ISAM) file system and per-task file locking, or alternatively CP/M-80. DX-85M utilized a text configuration file named CONFIG.SYS six years before this filename was used for a similar purpose under MS-DOS/PC DOS 2.0 in 1983.
The F-85 used single-sided 5¼-inch 100 tpi diskette drives providing 480 KB utilizing a high-density 4/5 group coded encoding. The machine was using a Western Digital FD1781 floppy disk controller with 77-track Micropolis drives. In later models this was expanded to a double-sided option for 960 KB (946/947 KB formatted[nb 1]) per diskette.
Durango later dropped the "F-85" model name and adopted a user model system, with 700 being the entry model and 950 being the full-featured model.
- The product flyer for the Durango 800 series documents an formatted "on-line capacity" of 1.892 MB for the diskette drives. The system, however, was equipped with two 5¼-inch Micropolis 100 tpi 77-track floppy drives by default, and 1.892 MB is about twice as large as the physical drive capacity documented in various other sources (480 KB per side), therefore, by "on-line capacity" they must have meant the available storage capacity available to users for the combination of two drives.
- Comstock, George E. (2003-08-13). Hendrie, Gardner, ed. "Oral History of George Comstock" (PDF). Mountain View, California, USA: Computer History Museum. CHM X2727.2004. Archived (PDF) from the original on 2017-03-23. Retrieved 2017-03-23.
- "800 Technical Summary - 800 Series Business Computer System" (PDF). San Jose, CA, USA: Durango Systems, Inc. Archived (PDF) from the original on 2017-03-23. Retrieved 2017-03-23.
- Guzis, Chuck (October 2006). "The Durango F-85 Computer". Sydex. Archived from the original on 2017-03-23. Retrieved 2017-03-23.
- "What is Durango?". Computerworld: 4. 1978-10-02.
- Guzis, Chuck (2009-09-13). "Durango GCR". Sydex. Archived from the original on 2017-03-25. Retrieved 2017-03-25.
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