"The computer book of the month is The Bios Companion by Phil Croucher. Long-time readers of this column will recall I have recommended his book before. This tells you everything you ought to know about the BIOS in your system. Post codes, options, upgrades, you name it.

Years ago, I called an earlier edition of this invaluable and I see no reason to change my view. Recommended.

Jerry Pournelle
Byte Magazine

"Croucher's book was invaluable 20 years ago and remains so today...... Every one of the 468 pages holds useful information, the author having zero tolerance for padding."

Davey Winder
PC Plus Magazine

"You've completerly impressed me with the quality and scope of your guides - extreme care has obviously gone into their research and preparation."

Jeremy Fleming

"His style is lovely: clear, jargon-free where possible, chatty and friendly with beautiful short paragraphs. It [Communications & Networks] joins my list of 'I wish I'd written it' books. I haven't come across such a good subject book in a long time at this price."

Lorna Kyle
Personal Computer World

"To any micro owner who wants to know what this comms business is all about, [Communications & Networks] is certainly one of the best around. ... Croucher is not only knowledgable about his subject, he's interested in it and communicates that interest to you. "

Ron Peck
New Computer Express

"There are few books about which explain as accurately and comprehensively as [Communications & Networks] does what communications are all about. The glossary is excellent."

Micro Decision

"...any PC user with a genuine interest in using his machine to its full potential will recognise [Communications & Networks] for the completely invaluable tool and often the inspiration that it is."

Yvonne Taylor
Which PC

"[Communications & Networks] is the type of book you can read on a bus or train without getting a headache from trying to understand what it means."


"As a recently reformed computer illiterate myself, I appreciated the author's straighforward yet humourous and light-hearted style of writing. He manages to strike the balance between too much and too little information. ... [Computing Under Protest] is never in danger of either boring or confusing the reader."

Emma Tyrrall
Practical PC

"Good documentation is important for any software, but even more so for an operating system - the documentation [for DOS 386 Professional] has some exceptionally clear explanations. Altogether, the documentation is an example of the right way of doing things, and other software manufacturers would do well to take note."

Matthew Holbrook
Computer Shopper

"The DOS 386 Professional manual sets arrived at 2130 local time today. We have had a brief look at them and wish to congratulate IMS on the excellent, clear and concise manner in which they have been presented."

Fred Parker
ETL Soft

"I remain impressed by Mr. Croucher's fluid writing style, practical orientation, enthusiasm, and strong technical knowledge."

Lance A Leventhal
Slawson Communications, Inc

JAR Professional Pilot Studies

"Its real value lies in taking the plethora of booklets and ring-bound photocopies associated with commercial examinations and condensing them into an attractive and portable form. The guy really does deserve a medal ~ he has made a genuine contribution to the body of professional aviation literature assembled during the course of the last century.

I heartily recommend it to students of commercial flight, if only as a souvenir of their efforts... "

Colin Hilton
Pro Pilot's Rumour Network

"(The) Book is quite a good compliment to our notes for students. We will be recommending all our students buy the books.... "

Naples Air Centre

"I got your book last month and am in the process of ploughing through it! Actually, I really like it and find it very interesting and easy to read."

Simon Rouse

"So far I have found your book an extremely helpful reference manual to carry around in my flight bag."

Blair Clubley

"I wish to commend you on a "work of art". I wish the CAA would produce a quick reference easy to read manual such as yours. Truly wonderful!"

Ebrahim Parkar

Post Codes

 Chips & Technologies
 Faraday A-Tease

Supersoft POST Codes

Note: Not all POST codes are included below - the latest information is in the The BIOS Companion, which contains over 100 pages of them.



11 CPU register or logic error
12 ROM POST checksum error
13 8253 programmable interrupt timer channel 0 error
14 8253 programmable interrupt timer channel 1 error
15 8253 programmable interrupt timer channel 2 error
16 8237A DMA controller error
17 8255 parity error detected
18 16K RAM critical region error
19 Memory refresh error
1A -
21 8259 interrupt controller error
22 Unexpected interrupt detected
23 Interrupt 0 (timer) error
24 Nonmaskable interrupt error
25 MDA video memory error
26 CGA video memory error
27 EGA/VGA memory error
28 8087 math coprocessor error
29 Keyboard controller error
2A -
31 Keyboard scan lines/stuck key
32 Floppy controller error
33 Floppy disk read error
34 Memory error at address x
35 Slow refresh, address x
36/37 -
38 -
41 BIOS ROM checksum error
42 BASIC ROM 1 checksum error
43-45 Basic ROM 2,3,4 checksum error


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11 CPU register or logic error
12 ROM POST A checksum error
13 ROM B POST checksum error
14 8254 programmable interrupt timer channel 0 error
15 8254 programmable interrupt timer channel 1 error
16 8254 programmable interrupt timer channel 2 error
17 8237A DMA controller 1 error
18 8237A DMA controller 2 error
19 DMA page registers error
1A 8042 parity error detected
21 16K RAM critical region error
22 Memory refresh error
23 CPU protected mode error
24 8259 programmable interrupt controller 1 error
25 8259 programmable interrupt controller 2 error
26 Unexpected interrupt detected
27 Interrupt 0 (timer) error
28 CMOS real time clock error
29 Nonmaskable interrupt error
2A 8087 math coprocessor error
31 Keyboard controller error
32 Stuck key or CMOS RAM error
33 Floppy controller error
34 Floppy disk read error
35 MDA video memory error
36/37 CGA, EGA/VGA RAM error
38 BIOS ROM checksum error
41 Memory error at address x
42 Slow refresh, address x
43-45 Display pass count
59 No monitor

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