I started working on restoring an ancient computer (Wang 2200E). Having dealt with this computer before, I decided it would be prudent to read out the ROM chips in case they need to be replaced again. However, these chips don't match anything I've ever heard of. Most annoyingly, there is no ground pin! There are 23 of these on the board, with no inked numbers the same.
The pinout is as follows:+5V 1 24 OE1 A0 2 23 D0 A1 3 22 D1 A2 4 21 D2 A3 5 20 D3 A4 6 19 D4 A5 7 18 D5 A9 8 17 D6
-12V 9 16 D7 A8 10 15 A10 A7 11 14 OE2 A6 12 13 nAR
Look familiar to anyone?