86-DOS 1.00

86-DOS is a "quick and dirty" operating system clone of CP/M created by Seattle Computer Products for their 8086 S-100 systems. It was later bought by Microsoft and used as the basis for IBM PC-DOS and MS-DOS


Release notes

This is the Seattle Computer Products 86-DOS "1.00" release, on which PC/MS-DOS was based. It is specifically for the 8086 SCP S-100 system with Cromemco 4FDC disk controller.

It includes a Z80 to 8086 translator for porting CP/M application.

Installation instructions

This archive contains a bootable disk image in ImageDisk format. The images are for 256 KB 8-inch Single Sided, Single Density floppy disk media (77 tracks, 1 head, 26 sectors per track, 128 bytes per sector FM)

Important: This disk is NOT for IBM PC compatible hardware or IBM PC emulators.

For your convenience, an emulator is included, which emulates the appropriate 8086 CPU and FDC cards.

Start the emulator with the configuration file, then press enter several times to get to the monitor, then enter uppercase "B" to boot DOS.

Source: http://www.schorn.ch/altair_5.php

Product type
Seattle Computer Products
Release date
Wed Apr 29 1981
Minimum CPU
Minimum RAM
User interface
Download count
17 (17 for release)


Download name Version Language Architecture File size Downloads
86-DOS 1.0 [SCP OEM] [SCP Cromemco 4FDC] (4-30-1981) (8 inch SSSD) 1.0 SCP Cromemco 4FDC English 660.78KB 12
86-DOS 1.0 [SCP OEM] [SCP Tarbell] (4-30-1981) (8 inch SSSD) 1.0 SCP Tarbell English 90.51KB 2
86-DOS 1.14 [SCP OEM] [SCP Tarbell] (12-11-1981) (8 inch SSSD) 1.14 SCP Tarbell English 117.91KB 3


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