From 662ed5b819c16e9224af83e5a969250fb85f2318 Mon Sep 17 00:00:00 2001 From: Jeff Parsons Date: Thu, 27 Aug 2015 17:00:45 -0700 Subject: [PATCH] Updated the MS-DOS 3.20 README --- disks/pc/dos/microsoft/3.20/README.md | 26 ++++++++++++++++++++++++-- 1 file changed, 24 insertions(+), 2 deletions(-) diff --git a/disks/pc/dos/microsoft/3.20/README.md b/disks/pc/dos/microsoft/3.20/README.md index d9f6271cd..fc67cd2df 100644 --- a/disks/pc/dos/microsoft/3.20/README.md +++ b/disks/pc/dos/microsoft/3.20/README.md @@ -1,8 +1,30 @@ MS-DOS 3.20 --- -The MS-DOS 3.20 floppies in the PCjs collection had a printed date of `March 21, 1986` (see the photo below). -However, all the files on Disks 1 and 2 are timestamped `7-07-86 12:00p`. +The MS-DOS 3.20 floppies in the PCjs collection are the only known non-OEM disk images available online. +All other known disk images are OEM releases (eg, HP, Zenith, Data General, Seiko Epson, etc.) and can +be found on sites like [WinWorld](https://winworldpc.com/product/ms-dos/320). + +Disks 3 and 4 contained a printed date of `March 21, 1986` (see the photo below), which is consistent with +the file timestamps (`2-14-86` and `3-14-86`) on those disks. However, all the files on Disks 1 and 2 are +timestamped `7-07-86`. Apparently, the Programmer's Reference files were finalized several months in advance +of the final MS-DOS 3.20 binaries. + +Based on the dates of the binaries, **July 7, 1986** is considered the release date of MS-DOS 3.20. + +NOTE: Disks 1 and 2 are restored versions of the original disks, since the original disks had been slightly +modified for personal use. The disks should be complete, and all files should be genuine and in the original +order. As proof, the following data from Disk 1: + + 00013db0 0d 0a 0d 0a 4d 69 63 72 6f 73 6f 66 74 28 52 29 |....Microsoft(R)| + 00013dc0 20 4d 53 2d 44 4f 53 28 52 29 20 20 56 65 72 73 | MS-DOS(R) Vers| + 00013dd0 69 6f 6e 20 33 2e 32 30 0d 0a 20 20 20 20 20 20 |ion 3.20.. | + 00013de0 20 20 20 20 20 20 20 28 43 29 43 6f 70 79 72 69 | (C)Copyri| + 00013df0 67 68 74 20 4d 69 63 72 6f 73 6f 66 74 20 43 6f |ght Microsoft Co| + 00013e00 72 70 20 31 39 38 31 2d 31 39 38 36 0d 0a 0d 0a |rp 1981-1986....| + +matches the data listed at [16bitos.com](http://16bitos.com/320ms.htm), as do the MD5 checksums of IO.SYS, +MSDODS.SYS and COMMAND.COM. Surprisingly Bad Bug in MS-DOS 3.20 ---