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.
Versions
| QDOS 0.10 | 1980-07 | Roughly half completed version of the OS. It implemented the original form of Paterson's derivation of Microsoft's FAT filesystem. In contrast to the earlier 8-bit FAT filesystem found in Standalone Disk BASIC-86, this variant already supported 12-bit table elements, reduced the number of FATs from 3 to 2, redefined the semantics of some of the reserved cluster values, and modified the disk layout, so that the root directory was now located between the FAT and the data area. Paterson also increased the previous 9-character length limit to 11 characters in order to support CP/M-style 8.3 filenames and File Control Blocks. This variant, however, still used 16-bytes directory entries and therefore is not compatible with what became later known as FAT12 in MS-DOS/PC DOS. Possibly shipped already. |
|---|---|---|
| QDOS 0.11 | 1980-08 | Bug fix shipment. |
| QDOS/86-DOS 0.2 | 1980-08 | EDLIN added. Renamed to 86-DOS by August 1980. |
| 86-DOS 0.3 | 15 November 1980 | First version licensed by SCP to Microsoft. |
| 86-DOS 0.33 | 1980-12 | First version distributed by SCP to OEMs and Microsoft as 86-DOS. |
| 86-DOS 0.34 | 29 December 1980 | Cleaned up release for SCP OEMs including Microsoft. |
| 86-DOS 0.42 | 25 February 1981 | At the indirect request of IBM (through Microsoft) size of directory entries changed from 16 to 32 bytes (similar to MDOS/MIDAS) in order to add support for a last-modified date stamp (2 bytes) and theoretical file sizes larger than 16 MB (4 bytes), thereby implementing the earliest form of the 12-bit FAT file system logically fully compatible with what became known as FAT12 in MS-DOS/PC DOS later on. 86-DOS retained the capability to read volumes written under older versions of 86-DOS up to MS-DOS 1.14 at the least, whereas generic MS-DOS 1.20 / PC DOS 1.1 and higher no longer supported it. |
| 86-DOS 0.56 | 23 March 1981 | Support for disk blocking/deblocking as requested since 1981-01-15. |
| 86-DOS 0.60 | 27 March 1981 | The file DOSIO.ASM found in 86-DOS 1.00 mentions that it is the "I/O System for 86-DOS version 0.60 and later". |
| 86-DOS 0.74 | 15 April 1981 | Added device files. |
| 86-DOS 0.75 | 17 April 1981 | Bug fix. |
| 86-DOS 0.76 | 23 April 1981 | Bug fix. |
| 86-DOS 0.80 | 27 April 1981 | Added system calls. |
| 86-DOS 1.00 | 28 April 1981 | Modified system calls. |
| 86-DOS 1.01 | 12 May 1981 | Bug fix. |
| 86-DOS 1.10 | 21 July 1981 | Purchased by Microsoft and renamed to MS-DOS on 1981-07-27, therefore the last version with genuinely matching 86-DOS and MS-DOS version numbers. First version known to implement the 'hidden' attribute. |
| 86-DOS 1.14 | 1981-10/11 | According to Tim Paterson PC DOS 1.0 basically reflects 86-DOS 1.14, other sources find a match of PC DOS 1.0 with MS-DOS/86-DOS 1.10 as of 1981-07-21 more likely. |
Source: http://www.schorn.ch/altair_5.php
Source: https://en.wikipedia.org/wiki/86-DOS
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