VIC-20 video memory size

From: Marko Mäkelä (Marko.Makela_at_HUT.FI)
Date: 2002-06-12 10:47:32

On Wed, 12 Jun 2002 wrote:

> The VIC-I can only see the first 8 KB. But this indeed would mean that the
> first extra 3 KB are available to the VIC-I.

True: it has 14 address lines (and 12 data lines), and A13 is connected to
the inverse of A15 on the VIC-20, for accessing the 4 kilobytes of
character generator ROM.  Hmm, what is displayed in the remaining 4
kilobytes?  6502 bus traffic?

> But I'm not a VIC-20 programmer yet so I 0 have no ideas what the
> advantages could be.

Limited, because there are far fewer VIC-20s with an internal memory
expansion than unmodified VIC-20s with an external memory expansion.


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