coms

hey i have an electronic books and they ask for some of the 4000 coms series and the 7400 coms series. Do these still exist and where can i get a hold of them? :.

I think you mean the CMOS series instead of the "coms" series.

Yes, these still exist, though I'd say the 7400 series is more popular. You can buy them at any broad-line distributor like Digi-Key, Mouser, or Newark.

Here, for example, is the "basic" 7400-series component, a quad two-input NAND gate device:

http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=TC74HC00APF-ND

-- The Gadget Shield: accelerometer, RGB LED, IR transmit/receive, speaker, microphone, light sensor, potentiometer, pushbuttons

The original CMOS logic series was the CD4000 series (pitifully slow by today's standards, but have a very wide supply range of 3 to 15V which is invaluable for some specialised uses)

The CMOS families 74HC, 74AC and 74HCT are the modern ones, very fast, 2 to 6V supply - they share pinouts with the original TTL 7400 series but only the 74HCT series are compatible with TTL logic chips directly (TTL requires logic threshold much lower than 50% of the supply voltage).

Unless you have a reason not to, I'd use the 74HC series.