Here is an excerpt from page 168 of Assembly Language Step-by-Step by Jeff Duntemann ...
Did these go the way of the dodo? I tried searching the web for blue cards or even references to them and have come up empty handed (or empty-eyed). Am I looking in the wrong place? I found this page on IBM/360 colored cards that sounds similar: http://planetmvs.com/greencard/index.htmlBlue Cards
A blue card is a reference summary printed on a piece of colored card stock. It folds up like a road map and fits in your pocket. The original blue card may actually have been blue, but knowing the perversity of programmers in general, it was probably bright orange. Most assemblers come with a blue card. Guard it with your life.
Blue cards aren't always cards anymore. One of the best is a full sheet of very stiff shiny plastic, sold by Micro Logic Corp. of Hackensack, NJ. The blue card sold with Microsoft's MASM is actually published by Intel, and has grown to a pocket-sized booklet stapled on the spine.
Blue cards contain very terse summaries of what an instruction does, what operands are legal, what flags it affects, and how many machine cycles it takes to execute. This information, while helpful in the extreme, is often so brief that newcomers might not quite fathom which edge of the card is up.
If not these fabled blue cards, what do you guys use for quick references for 8088/8086/286/386/486 instructions?