The median listing price for them on eBay for a 29B with pack seems to be around $3-400 which IMO is a little steep for a 30+ year old PROM programmer. Hopefully your best offer successfully accepted was much lower! I think the part cost on the PROMs pales in comparison. For the cost of the 29B, you could design a replacement for the original PROM, have some boards fabricated, stuff them and you'd still be ahead a few hundred bucks ... starts to make sense at those kind of prices, imo.
Best, Sean On Tue, Sep 8, 2015 at 3:14 PM, Marc Verdiell <marc.verdi...@gmail.com> wrote: > >From: dwight <dkel...@hotmail.com> > >If I were doing it. > >First you need to find out if it needs OC output. > >There are many flash parts in surface mount that can have the higher > speeds. > >Add some 74LVC245 to give bus drive needed, also surface mount. > >All on a little PC board. There would be a lot of wasted space in the > flash > but what the heck. > >Put an edge connector on the board to deal with programming. > >All will fit in a smaller space than the original part. > >Dwight > > That would be great engineering fun! But at less than $4 for the blanks, > using the old PROMs and the vintage programmer seems pretty > straightforward, > vintage correct, and low risk solution. Miraculously, my best offer got > accepted on ebay, so semi-affordable vintage clunky Data I/O 29B Programmer > and plenty of blanks are being shipped to me :-). I count collecting > vintage > tools for servicing your vintage machine as part of the fun too... > Marc > > >