86-DOS

CP/M

SPECIAL NOTE: 86—DOS is not related to the popular CP/M operating system of Digital Research. Disk directory formatting and space allocation are completely different and incompatible. 86—DOS does, however, provide a utility called RDCPM which will transfer files from CP/M disks to 86—DOS disks. Further, operating system calls and calling conventions have been provided which make possible automatic translation of Z80 programs written for CP/M into 8086 programs that run under 86—DOS.

cpu

Intel 8086

random

Obtuse triangle (Wikipedia) An obtuse triangle (or obtuse-angled triangle) is a triangle with one obtuse angle (greater than 90°) and two acute angles. Since a triangle’s angles must sum to 180° in Euclidean geometry, no Euclidean triangle can have more than one obtuse angle.

successor

successor of

CP/M

tagged

86-DOS Instruction Manual (patersontech.com) 86-DOS provides the tools needed to develop programs for the 8086, as well as a hardware-independent environment in which to run these programs. It is a very modular system. At its core is the disk file manager and I/O device handler, and everything else is considered a “user program”. This allows the system to be easily trailored to any custom requirements.

tags

version 0.1 disk

86 DOS Version 0.1 C Serial # 11 (ORIGINAL DISK) (archive.org) This is the precursor to MS-DOS and is likely the oldest known version to survive. (I had previously uploaded Version 0.34, which was at the time thought to hold that honor.)

Wikidata

https://www.wikidata.org/wiki/Q1550345

Wikipedia

86-DOS (Wikipedia) 86-DOS (known internally as QDOS, for Quick and Dirty Operating System) is a discontinued operating system developed and marketed by Seattle Computer Products (SCP) for its Intel 8086-based computer kit.