In message , Martin McCormick writes > Do any of the small development systems work in DOS? What does the >program file for such a chip look like? I have this picture in my mind of >a chip containing several of the usual logic gates such as And and Or plus >a few inverters or flip-flops and then some kind of equation to connect them >together in the way desired to build the particular application. I've been >hearing about GAL's and PAL's for about ten years, but I haven't gotten in >to any actual work with them. I seem to recall being scared away when I >found out how much the development systems cost. You can get the latest Lattice development software for their smaller devices (up to 8000 gates) including their 22V10 ispGAL free from http://www.latticesemi.com All you need to program them is a simple buffered download cable. Leon -- Leon Heller: leon@lfheller.demon.co.uk http://www.lfheller.demon.co.uk Amateur Radio Callsign G1HSM Tel: +44 (0) 118 947 1424 See http://www.lfheller.demon.co.uk/dds.htm for details of a simple AD9850 DDS system. See " "/diy_dsp.htm for a simple DIY DSP ADSP-2104 system.