The problem was size - something like a PYE PFX or a Storno 4000 was already tightly packed with parts, so there wasn't really any room for a wide-bodied 24 pin or 28 pin EPROM in there. You only really had that luxury in mobile radios.
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And can probably do it in a way that's easily reversible with plug-in boards etc. rather than butchering the PCB a bit
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I forgot to say that Buzby couldn't have done that mod any more neatly, I was imagining bits of vero stuck on the underside of the PCB.