> Ideally the code should not require any special software or hardware on the >host side so that any terminal program that can talk X,Y,Z or modem would >suffice. HyperTerminal may be a shitty COM package, but at least you know >everyone has it. I don't really see any need for any fancy relocation >the mainline code if desired, but that is otherwise dead code. The main >reason is that it minimizes complexity and interference with the mainline >code. Any comments? Rick, I have one just about done. It accepts an Intel HEX file directly, burns the code space appropriately. It is activated by pulling a pin low on boot (has pull-up for normal operation, and can be still used for other purposes after starting normal operation). This can't be tested because I don't have a chip, but it "works" on a '77. Andy ================================================================== Andy Kunz - Statistical Research, Inc. - Westfield, New Jersey USA ==================================================================