Pc Dos

Shopping on line can be easy, simple and save you lots of money. It can also take a lot of your time, frustrate you, and result in unwanted purchases. Now the same can be said for regular high street shopping, but with the vast opportunity presented by the Internet it will pay you to spend a few minutes reading this and understanding how to better optimize your Pc Dos shopping experience:

1. Compare - without doubt the biggest advantage that the Pc Dos offers shoppers today is the ability to compare thousands of Pc Dos at a time. This is a great thing, but not necessarily all the time! Too much can be daunting at times so take advantage of the great comparison sites and where possible let them do the hard work for you.

2. Research - if it has been said it will be on the internet. Ignorance is no longer a justifiable reason for buying the wrong thing. Take the time to research in detail everything that you could possible want to know about

3. Testimonials - don't know anybody that has bought a Pc Dos? Wrong! If the Pc Dos is good the internet will let you know. Use the Internet as a friend and get testimonials before you buy.

4. Questions - Got a question about Pc Dos then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....

5. Reputation - Never heard of the company selling Pc Dos? Don't worry, no reason why you should know every company in the world, but you know someone that does! Use the internet to find out what people are saying about Pc Dos and build up a picture of their reputation for sales, returns, customer service, delivery etc.

6. Returns - still worried that even after all of the above your Pc Dos wont be what you want? Check out the returns policy. There is so much competition now that someone, somewhere is bound to offer the terms that you are comfortable with.

7. Feedback - happy with your Pc Dos then let people know, after all you are depending on others people input in your buying decision, so why not give a little back.

8. Security - check for the yellow padlock on the Pc Dos site before you buy, and the s after http:/ /i.e. https:// = a secure site

9. Contact - got a question about Pc Dos, or want to leave a comment then check out the sites contact page. Reputable companies have them and respond.

10. Payment - ready to pay for your Pc Dos, then use your credit card or PayPal! Be aware of companies that don't accept them, there may be genuine reasons but given the huge amount of choice you have when buying online there is no reason at all not to buy via credit card or PayPal.

{{Infobox OS|| name = PC-DOS| logo = | screenshot = | caption = A typical command line in PC DOS.| developer = IBM| source_model = [Closed source| kernel_type =| ui = [Command line interface| license = Proprietary| working_state = Historic| website =-->

IBM PC-DOS was a Disk Operating System for the IBM Personal Computer. The original 1981 arrangement between International Business Machines and Microsoft was that Microsoft would provide the base product and that both firms would work on developing different parts of it into a more powerful and robust system, and then share the resultant code. MS-DOS and PC-DOS were to be marketed separately: IBM selling to itself for the IBM PC, and Microsoft selling to the open market. However, at no time did IBM acquire the ownership of the source code of the operating system for its own IBM PC. ThinkPad products currently have a copy of the latest version of PC-DOS in their Rescue and Recovery partition.

The final release, PC-DOS 2000, found its niche in the embedded software market and elsewhere. It was released to correct issues with the Year 2000 problem. Versions 7 and 2000 supported a floppy disk format known as IBM Extended Density Format, which allowed for more data to be written to a standard floppy disk than usual.

Versions

PC DOS 1.0 - August 1981 – initial release with the first IBM-PC (COMMAND.COM is 3231 bytes. FAT-12, with no subdirectory support.
PC DOS 1.1 - May 1982 – support for 320 Kilobyte double-sided floppy disk. COMMAND.COM has 4959 bytes.
PC-DOS 2.0 - March 1983 - support for IBM Personal Computer XT. had a maximum disk partition size of 10MB, came on two 180 kB 5.25-inch disks or one double-sided 360 kB disk. COMMAND.COM has 17664 bytes.
PC DOS 2.1 - October 1983 – support for IBM PCjr. COMMAND.COM has 17792 bytes.
PC DOS 3.0 - August 1984 - support for IBM Personal Computer/AT. supports the AT's DS/HD 1.2MB floppy disk drives. Introduces FAT-16 file system on hard drives. COMMAND.COM has 22042 bytes.
PC DOS 3.1 - March 1985 - COMMAND.COM has 23210 bytes.
PC-DOS 3.2 - December 1985 - required 128 kB RAM and came on one 720 kB disk or two 5.25 disks. COMMAND.COM has 23791 bytes.
PC DOS 3.3 - April 1987 – support for IBM PS/2: 1.44 MB floppy disk drives, added codepage support (international character sets). COMMAND.COM is 25307 bytes.
PC DOS 4.0 - June 1988 – added DOS Shell & support for hard disks of >32MB using the format from Compaq DOS 3.31. But it had many bugs and less free conventional memory than before. Generally regarded as an unpopular release. COMMAND.COM has 37637 bytes.
PC-DOS 4.01 - August 1988 - came on two 3.5-inch DD diskettes (720K) and required 256 kB RAM. Mostly bug fixes. Maximum disk partition size was 2000MB.
PC-DOS 5.0 - May 1991 - three 3.5-inch DD diskettes. Able to run DOS in High Memory Area. COMMAND.COM has 47987 bytes.
PC-DOS 5.00.1 - February 1992 - bug fixes. COMMAND.COM has 48025 bytes.
PC-DOS 5.02 - September 1992 - adds support for portable computers and International Organization for Standardization fonts COMMAND.COM has 47990 bytes.
PC-DOS 6.0 - May 1993 - Beta version, not released.
PC-DOS 6.1 - June 1993 - four 3.5 inch 1.44M disks. PC-DOS and MS-DOS now offer significantly different utilities. IBM dropped QBasic and its associated Edit (MS-DOS). Replaced editor with E (PC-DOS); but added no programming language. COMMAND.COM has 52589 bytes.
PC-DOS 6.2 - not released
PC-DOS 6.3 - December 1993 - five 3.5 inch 1.44M disks. Enhanced several utility programs. Became popular with Original Equipment Manufacturers because MS-DOS had stopped stand-alone, non-Windows releases at their version 6.22. COMMAND.COM has 54654 bytes.
PC-DOS 7 - November 1994 - could purchase in floppy or CD-ROM format. The diskette set had a normal 1.44M installation floppy and four in a special 1.88M IBM Extended Density Format format. Added the REXX interpretive language. Included enhanced utilities. COMMAND.COM has 52956 bytes.
PC DOS 2000 - April 1998 - six diskettes (installation and five XDF) or one CD-ROM. A Year 2000 Certified release of v7.0 with fixes for Year 2000 problem (Y2K). Floppies were labeled "PC DOS 2000, Includes PC DOS 7". COMMAND.COM has 52965 bytes.

Image:PC-DOS 3.2 box jacket.pngImage:PC-DOS 4 getting started manual.pngImage:IBM PC-DOS 5 manual cover.png

References

IBM Corporation and Microsoft, Inc. Dos 3.30: User's Guide. IBM Corporation, 1987. Part number 80X0933.
IBM Corporation and Microsoft, Inc. Dos 3.30: Reference (Abridged). IBM Corporation, 1987. Part number 94X9575.
IBM Corporation. Getting Started with Disk Operating System Version 4.00. IBM Corporation, 1988. Part number 15F1370.
IBM Corporation. Using Disk Operating System Version 4.00. IBM Corporation, 1988. Part number 15F1371.
IBM Corporation. IBM Disk Operating System Version 5.0. User Guide and Reference. IBM Corporation, 1991. Part number 07G4584.
IBM Corporation. PC DOS 7 User's Guide. IBM, 1995.
IBM Corporation. IBM PC DOS and Microsoft Windows User's Guide. Indianapolis, IN: Que Corporation, 1995. ISBN 0-7897-0276-2.