Removed from WORKING but obsolete test equipment, early 1990's heritage.
Oh yes these are old (about 35 years!) devices for sure but often so, so very hard to find when restoring or servicing dated entertainment or industrial equipment
I used to sell these devices way back in the early 1980's, the trade price was astronomical way back then
FUJITSU (Japan) EPROM
NMOS
Type: MBM2764-25
Ceramic package
Date codes indicate manufacture 1987
250nS access time
64K (8K x 8)
These are used, previously programmed. Although they were partially UV erased, it would be prudent to erase them thoroughly before reuse! Then start loading your new program into the device then placing a UV light proof label over the quartz window.
If you should need datasheets, these are available (by request)
Stored and supplied in suitable ESD safe material (more to keep the legs straight, these are not CMOS devices)
