Hi, I got two M900 programmers. One works, but the other one doesn't. I only have the 2716 module for them, which is good, but I do not know where you can get other personality modules for them. I use a Microprofessor that has the EPROM Burner expansion for burning my EPROMS. However, I am currently designing my own EPROM burner so I can do 2708 and 8755A chips. I was going to make it all fancy-pants where it would do all the right programming voltages and address translations (for different address pin locations on different chips) etc, but I think it would be easier to make my own "personality modules" which will ease the hardware design. The chips I need/want to program are 2704, 2708, 2516, 2716, 2732, 2732A, 2532, 2564, 2764, 27128, 27256, 2816 and 8755A. I have checked out the capabilities and prices of current EPROM burners, but they are far too expensive for what I want, do much more than I need, and they usually do not do the 2704/8 or 8755A without an expensive personality module. So, in light of my enjoyment in building old computers, I'm building a complete system just for the fun of it and to burn EPROMs for me. As the 2708 uses a few voltages, I decided to use a CPU that also requires a few voltages - the 8080 chip. So, it will be an 8080 system, running 40K of RAM, 8-16K of ROM, a pair of 8255 for EPROM signals (plus extra logic etc as required), an 8251 for comms, and I may even hook up an LCD so I can use it without requiring a terminal. Of course, I could get side-tracked and just use my expanded AIM65 system - as it has all the monitor/debug software, enough IO ports and the built in display...... ;) I could always mod some of my older boards that use 2708 chips to use 2716 chips, but I like the historical accuracy of 2708 devices - and I've got quite a few in stock. Seeyuzz River