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Don’t forget you need to erase 27c400 as well. They are erased with UV by exposing the window and applying intense UV light for 6o minutes or so. If you only want to burn one ROM once and you get a blank ROM that’s fine but if you get it wrong then you have to erase it...
A good alternative is from gglabs where a flash (electrically erasable ROM) is used. It plugs in the same as a 27c400 would. Downside is you can use them with a TL866 but you need an adapter. Upside is you can reuse them without UV erase cycles (erase command in programmer software). So you can get it wrong and retry again right away, not wait for the erase time (assuming you have bought a reasonable UV erase unit). Worth considering if you thing you might want to try diagrom or some other rom version in future.
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