>I have come across a few old machies that had sockets like this, but never
>one that actually had a BASIC rom in it. I don't know what the ROM in this
>socket needs to contain in order for the BIOS to recognise it as a BASIC
>ROM and run it if boot fails.

I think the BASIC ROM has a particular entry address for iniitialisation
and hooks to INT18H I think.

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