Re: NOVA 15,16bpp

From: Jo Even Skarstein <>
Date: Wed, 1 Apr 1998 19:20:24 +0100

On Wed, 1 Apr 1998, Petr Stehlik wrote:

> JES>65K has twice as many colours ;-) If you're using pure VDI then
> JES>there's no difference between these formats except the number of
> JES>colours.
> What about videoram storage? How is the 15bpp organized?

B: 0-4
G: 5-9
R: 10-14

Before you move this word to the videoRAM you must convert it to

This (and more) is documented in the file texte/common.txt

> JES>Some programs which bypass the VDI when building/converting
> JES>images (e.g. ImageCopy 4) doesn't work properly in 16bit, but
> JES>fine in 15bit.
> :-) I got it. So 15bpp is just hardware workaround of software problems
> on our computers.

No, 15bit is not Atari-spesific, many VGA-cards support this. I'm not
sure why, but I guess it's easier (from both a user's and a
programmer's point of view) to operate with the same resolution for
all three colour-components.

> BTW, what about the 24 and 32bpp? Does anybody use it?

With only 1Mb DRAM; no ;-) Ask Mike or Magnus, they both have 4Mb

** Jo Even Skarstein
** beer - maria mckee - atari falcon - babylon 5
Received on on. april 01 1998 - 19:20:24 CEST

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