options for replacing failed small ROMs in PDP-11

On 2016-06-24 22:47, Al Kossow wrote: I have a Data-I/O Series 22 which could do these, plus another burner that may do them. I haven't checked the whole thread, but I'm sure some others on here have the equipment to do these too. Is there a file containing the image ? You'll need to identify if that chip uses tri-state or open collector bipolar PROM. If DEC didn't completely obliterate the original markings, those would be very helpful (i.e. Atari tended to stamp on top of the original chip #s, so with some careful examination, you can usually figure out the original chip #). The bipolar PROMs aren't cheap like an EPROM.... depending on the source/brand/timing they cost anywhere from $5 to $20+ each. Then most people will usually ask for $5 to $10 to burn one.... or if you are really lucky... free.... -- Curt