early DSP

Hi Chuck OK, I'll bite. What were the two instructions? Most DSP's are built around a MAC. I would guess the large word length might be to include immediate coefficients. I know some early ones like the Intel 2920 ( not to be confused with AMD's 2900 series parts ) ran as a continuous loop. I'd guess the 7720 was similar in that it would just loop. Most of these type were to create inline filters to shape the band pass going to and from codec's. Even though the Intel 2920 was just a simple loop, it was able to be used for something like a spectrum analyzer with just the coding. Not too bad for something that doesn't even have conditional jump instructions. These types of DSP's were obsoleted when Motorola and TI came out with DPS's that were more like traditional uP's of the time. The connected a uP with a MAC. The Motorola was more easily programmed by someone familar with regular uP's while the TI's had all kinds of restrictions on how different parts of the memory could be used. I have a I2920 developement SDK and a few 2920's. Someday, I'd drag it out and play some with it. Dwight _________________________________________________________________ The MSN Entertainment Guide to Golden Globes is here. Get all the scoop. http://tv.msn.com/tv/globes2007/