I have just built a small circuit using seven 74F TTL chips which works fairly well at 50MHz. I would now like to cram it into a single chi and speed it up a tad. . Casting my mind back many years when I was working we used devices called GALs from Lattice and I suspect that SPLDs are the modern equivalent. Questions. Would these devices work at 80MHz? Who is the favourite manufacturer? How do you program them? And, yes, I have Googled but that has only increased my confusion --=20 __________________________________________ David C Brown 43 Bings Road Whaley Bridge High Peak Phone: 01663 733236 Derbyshire eMail: dcb.home@gmail.com SK23 7ND web: www.bings-knowle.co.uk/dcb --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .