You're bidding here on an unused PROMs MH74S287. This listing is for one PROM (1pc).
These devices require a >1 millisecond programming pulse, similar to the Texas Instruments SN74S287. They may not be compatible with some PROM programming devices.
List of my previous sales of this item:
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| User ID | Qty | Purchased | Location | Feedback | |||||
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| sira201110 | 10 | Aug-11-16 | Japan | very good seller! thanks!! | |||||
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| commander_zod | 20 | May-10-14 | Germany | ok | |||||
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| ltombini | 5 | Mar-25-14 | Italy | AAAAA++++ All perfect very fast shipping | |||||
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| e666c725c | 20 | Feb-15-14 | Germany | Excellent seller, very fast shipping | |||||
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| el3ctrosales | 5 | Aug-25-13 | Romania | Thank you. Great seller.Hope to do business with you again. A+++++++++++++++ | |||||
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| cfsaw | 6 | May-03-13 | United States | Great Seller...Quick Ship...Good Communication...Highly recommended...A+++++ | |||||
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| markg2911 | 6 | Feb-18-13 | Australia | Received with Thanks!! | |||||
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| gr8void | 5 | Feb-04-13 | U. Kingdom | Quick delivery, good communication, pleasure doing business, thanks! | |||||
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| pci55 | 2 | Dec-25-12 | France | envoi rapide, et serieux, merci, ebayeur++++++++ | |||||
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| recorder416 | 2 | Nov-23-12 | U. Kingdom | Very good transaction | | ||||
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Please do visit also my eBay store 
elebcz to see the other items you could be interested in. Items will be shipped by a priority airmail. Typical delivery times are: Europe (All countries) 7...10 days. All other destinations (North and South America, Asia, Africa, etc.) 10...15 days. For some destinations which are very far from Europe shipment may take a couple of days more. These destinations include countries like New Zealand, Hong Kong, Korea, Japan, etc.