options for replacing failed small ROMs in PDP-11
rescue at hawkmountain.net
Fri Jun 24 22:11:55 CDT 2016
On 2016-06-24 22:47, Al Kossow wrote:
> On 6/24/16 7:42 PM, Josh Dersch wrote:
>> A Data-I/O 29A or 29B will do the job nicely.
> and a Unipak I or II like this
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
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....
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