The EW900 series are a little twitchy (I have a 904B for sale if anyone is interested). The I/O port addresses are fixed and the burner is sensitive to CPU speed. See the notes here
It will work fine on a 5150 or 5160-type machine and probably on the 5170 (but see note about VGA cards).
Sorry, it was sold months ago. :-(I've spent most of the day trying to get an Hi-Lo 51P-01 eprom programmer working to no avail. I need to create a new BIOS rom for my IBM 5170. Since I can't get this HiLo programmer to work it seems I need to try another device. If you haven't sold your programmer yet, would you accept $20 + shipping for yours?
Heres what the programmer and interface boards look like.
There is some glare on the interface board, it has "CSA-01 HILO System Adapter" printed above the large black heat dissipator.
BTW: this thing became so hot inside the AT that I thought it might damage nearby boards; not sure if that is normal or not.
Although the 904 would do what I want in this project, if I understand correctly, I would need to keep a computer without VGA running at 8Mhz or less ready and waiting to operate it in the future.