Andrew wrote: I liked "VHDL for Programmable Logic" by Skahill. Note that it covers VHDL and Cypress PLDs, rather than PALASM and Lattice GALs. The concepts it teaches are all relevant; you'll just have to deal with the significantly different syntax of PALASM and the lesser capabilities of the GAL parts. (Or use Xilinx XC96xx parts instead.) For more in-depth coverage of VHDL, I quite like the "Designer's Guide to VHDL" by Ashenden. I'm not sure what's out there in the way of books that directly cover PALASM. There are probably some good books on Verilog. On the U.S. west coast, almost all ASIC design is done in Verilog. I'm told that VHDL is used for most ASIC design on the east coast and in Europe. However, VHDL seems more popular for FPGA and CPLD design everywhere. Eric