I have been working on designing a PCB for a Z80 computer that I plan to sell a few times for interested people. The Z80 will work at a maximum of 8 MHz and has parallel lines going to a system controller and an SRAM chip. The board is 170x110 mm in size. Currently I use 16 mil traces for the parallel bus and address lines and a spacing of 25 mil between them. I wonder whether this is enough for 5V data @ max. 8 MHz. Do I need termination resistors?
What do you think?