Thought I'd let you know that, according to the datasheet, the Fairchild NMC27C32BQ only requires +12.5 to +13V for programming. They are also discontinued but still available on eBay.   https://www.ebay.co.uk/itm/5PCS-NMC27C32BQ200-DIP-24-32-768-Bit-4096-x-8-EPROM-/392316643082
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