Re: Crosspost: Did the cpu influence the display?

["Alex Freed" <alexf@mirrow.com>]

"Mike Wynne" <mikeywyn@hotmail.com> wrote in message
Ws6dnbkfA8n7MCreRVnyvA@pipex.net">news:Ws6dnbkfA8n7MCreRVnyvA@pipex.net...
> Try designing a video circuit in discrete
> logic (Like the Apple II) then tell me how much more hardware is required
to
> obtain a linear 40 or 80 column mode.

Not that much in fact. Basically you just need 2 sets of counters: one to
count character positions in a line, say modulo 40.
Then the lines etc. The other  is a straight binary up counter for linear
addressing. We are talking about some 4 chips extra
of standard logic. $1 or so in parts, but they need to be routed on a board
too.