30 Oct '14, 8am

A Graphics Card for a Homebrew Computer

Wiring check might be worthwhile. It looks like unused input pins are left floating. That’s generally not good practice with CMOS, as the input structures have high enough impedance that they tend to pick up stray EMI and needlessly toggle their input state, consuming a bit of extra current in the process. In some cases you can get high frequency self-oscillation, which draws more current. I once found a single floating and self-oscillating pin was wasting 5mA. Multiply by a large number of floating pins and it can add up to a significant amount. I’m not familiar with any GALs specifically, so I looked up the datasheet on the 22V10. It says there are internal active pull-ups on all I/O pins. Yet still makes the recommendation that all unused pins, including pins set for output and tri-stated, be tied to VCC, GND, or some actively driven pin, to improve noise immunity and r...

Full article: http://hackaday.com/2014/10/30/a-graphics-card-for-a-home...

Tweets

Taxi Tales: Card Trouble

taxistorys.blogspot.com 31 Oct '14, 8pm

I got a call to pick up from one of Barrow’s more expensive hotels this morning, when I got there my passengers turned out...

FESTIVE SEASON COMES EARLY WITH AMEX CARD: Dear...

ilovemycreditcard.com 29 Oct '14, 2am

Oct 29 FESTIVE SEASON COMES EARLY WITH AMEX CARD By kiasu Dear American Express card members, Start your festive celebrati...

We're all smiles for @mygreenschools selfie: 2014 Midyear Report Card

We're all smiles for @mygreenschools selfie: 20...

usgbc.org 29 Oct '14, 1pm

Are you interested in a snapshot of the work that the Center for Green Schools has accomplished in the first half of 2014?...