上世纪90年代中文系统几为UCDOS和SPDOS瓜分，这两种主流中文平台为许多计算机书籍作为必讲内容介绍。那时中学计算机只学三样：DOS、WPS、FOXBASE。
几天前从本论坛下载了一个SPDOS的软盘镜像，是旧的IMG文件（WinImage不能解压）。后来借了软驱用HD-COPY解压。原文件是DOS3.3版（不支持大硬盘）。自己做了个
spdos.img（DOS7版）。在这个Windows一统天下的时代，相信很多人对过去DOS时代的经典软件尚怀有感情。这个SPDOS平台在今天也没什么实用价值，网上很难找到。只是为了满足一下收藏的愿望。
该IMG文件可用WinImage解开，文件夹中文件为SPDOS5.0版（内含WPS2.0）。可用Virtual PC试验（运行WPS时若无反应按上下箭头键试试）。以下为最近本人试用总结：
1、用gular引导spdos.img可以运行SPDOS，但运行其中的WPS即死机。不知是不是我这台Athlon机独有的现象。（因为现在很多朋友运行DOS都是用gular引导一个软盘镜像）。
2、用DOS7软盘启动盘和U盘启动盘都可以运行其中的WPS，最好不要加载内存管理软件（指HIMEM、EMM386），否则SPDOS会占用大量内存。而不加载SPDOS占用内存反而少（可用MEM查看）。SPDOS吃内存蛮厉害的，且硬件适应性不如UCDOS，所以为什么UCDOS后来居上不是没有道理的（当然UCDOS打败SPDOS还有其它原因）。
3、WS、WS20、WS25都是WORDSTAR（WORDSTAR是WPS出来之前常用的字处理软件，功能比较少）。
4、我对DOS下的字处理软件比较感兴趣，精干短小（只有几个文件，一目了然），DOS下比较好的字处理软件有WPS、CCED、ED（CCDOS97中带的一个软件，好像介绍的不多，只有一个文件）。字处理自动断行是很重要的功能，现在好像只有WPS自动断行，其它的要手动设置。不过在WPS中制表实在是一件痛苦的事。
5、总结：DOS下的字处理软件还是以UCDOS及其中的WPS为最佳（网上有程一的UCDOS精简版，可下载一试）。
附：下载文件在中国DOS联盟文件上传系统中。
http://upload.cn-dos.net/img/1636.rar
In the 1990s, Chinese operating systems were mostly divided between UCDOS and SPDOS. These two mainstream Chinese platforms were introduced as essential content in many computer books. At that time, middle school computer classes only taught three things: DOS, WPS, and FOXBASE.
A few days ago, I downloaded a floppy disk image of SPDOS from this forum. It was an old IMG file (WinImage couldn't extract it). Later, I borrowed a floppy drive and used HD-COPY to extract it. The original file was DOS 3.3 (which doesn't support large hard drives). I made my own spdos.img (DOS 7 version). In this era dominated by Windows, I believe many people still have feelings for classic software from the past DOS era. This SPDOS platform has no practical value today, and it's hard to find online. It's just to satisfy the desire for collection.
This IMG file can be extracted with WinImage, and the files in the folder are version 5.0 of SPDOS (containing WPS 2.0). It can be tested with Virtual PC (when running WPS and if there's no response, try pressing the up and down arrow keys). The following are my recent trial summaries:
1. Booting spdos.img with gular can run SPDOS, but running WPS in it causes a system crash. I don't know if it's a unique phenomenon on my Athlon machine. (Because many friends now boot a floppy disk image with gular to run DOS.)
2. Both a DOS 7 floppy boot disk and a USB flash drive boot disk can run WPS in it. It's best not to load memory management software (referring to HIMEM, EMM386), otherwise SPDOS will occupy a large amount of memory. And if SPDOS is not loaded, the memory occupation is less (you can check with MEM). SPDOS consumes a lot of memory, and its hardware adaptability is not as good as UCDOS, so there's a reason why UCDOS took the lead later (of course, there are other reasons why UCDOS defeated SPDOS).
3. WS, WS20, WS25 are all WORDSTAR (WORDSTAR was a commonly used word processing software before WPS came out, with relatively few functions).
4. I'm more interested in word processing software under DOS, which is compact and short (only a few files, clear at a glance). The relatively good word processing software under DOS includes WPS, CCED, ED (a software included in CCDOS97, which seems not much introduced, only one file). Automatic line breaking in word processing is a very important function. Now it seems only WPS has automatic line breaking, and others need to be set manually. But making tables in WPS is really a pain.
5. Summary: The word processing software under DOS is still best with UCDOS and WPS in it (there are streamlined versions of UCDOS by Cheng Yi online, which can be downloaded and tried).
Attachment: The downloaded file is in the file upload system of the China DOS Union.
http://upload.cn-dos.net/img/1636.rar