Eric, Yes, you are correct. My fault. I've always mixed up MOSTEK and MOS Technology. It seems I remember that the MOS Technology folks left Motorola because of the way the 6800 was progressing, but that could be a faintly remembered rumor also. MOS Technology was responsible for the 6550 ram. I seem to remember having a book from 82 or 83 from MOS Technology somewhere. Kev --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.445 / Virus Database: 250 - Release Date: 1/21/2003