On Thu, Nov 6, 2008 at 8:41 PM, Roger Weichert <rweicher@bigpond.net.au> wrote:
> From the data sheet I understand that the 78233GC doesn't have any on-board
> ROM .

Could you post the link of the datasheet?

Google shows this one.
http://pdf1.alldatasheet.net/datasheet-pdf/view/101234/NEC/UPD78233GC-3B9.html

It has 16KB internal program ROM.

Xiaofan
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