pa1158@sdcc13.ucsd.edu (Viet Ho) (10/28/89)
What exactly is 4096 Hires? Is it true that you can display 12
bits in 640X400 (or overscan) by switching between 3 RGB 4bit hires
screens? One of the developers at the local San Diego Groups
tried this and got a very bad flicker. So how does NewTek do it?
-Viet
vho@ucsd.eduportuesi@tweezers.esd.sgi.com (Michael Portuesi) (10/30/89)
>>>>> On 27 Oct 89 18:50:42 GMT, pa1158@sdcc13.ucsd.edu (Viet Ho) said:
v> What exactly is 4096 Hires? Is it true that you can display 12
v> bits in 640X400 (or overscan) by switching between 3 RGB 4bit hires
v> screens? One of the developers at the local San Diego Groups
v> tried this and got a very bad flicker. So how does NewTek do it?
with a custom copperlist, no doubt.
--M
--
__
\/ Michael Portuesi Silicon Graphics Computer Systems, Inc.
portuesi@SGI.COMstan@teroach.UUCP (Stan Fisher) (10/31/89)
In article <4801@sdcc6.ucsd.edu> pa1158@sdcc13.ucsd.edu (Viet Ho) writes: > What exactly is 4096 Hires? Is it true that you can display 12 >bits in 640X400 (or overscan) by switching between 3 RGB 4bit hires >screens? One of the developers at the local San Diego Groups >tried this and got a very bad flicker. So how does NewTek do it? > -Viet > vho@ucsd.edu I talked to Mr. Blackwell (sp?) at the NewTek booth at AmiExpo about DigiView 4.0 and the new 4096 Hires mode. They are dynamically altering the pallete every scan line, within a 4 bit hi-res screen. Kinda like Sliced high res (as opposed to SHAM - sliced ham). The results are absolutely INCREDIBLE!! At least on the few frames they were showing on the demo. The result picture file is NOT IFF and takes all of the machines resources (power) to perform the display. Digitizing time is only marginally increased. If you bought DigiView 3.0 at the show (from one of the other venders, 'cause NewTek wasn't selling product) you could sign up for a FREE update to 4.0 when it ships. Stan Fisher - stan@teroach.phx.mcd.mot.com - asuvax!mcdphx!teroach!stan Motorola Microcomputer Division, Tempe, Arizona - Voice (602) 438-3228 Call our User Group BBS "M.E.C.C.A." running Atredes 1.1 @ (602) 893-0804
jdutka@wpi.wpi.edu (John Dutka) (10/31/89)
In article <11906@mcdphx.phx.mcd.mot.com> stan@teroach.UUCP (Stan Fisher) writes: >marginally increased. If you bought DigiView 3.0 at the show (from one of >the other venders, 'cause NewTek wasn't selling product) you could sign up >for a FREE update to 4.0 when it ships. Can anyone give me the address/number to write/call for the update when available? I registered for the DigiView 3.0 I bought when it 1st came out, but I wasn't advised about DigiView Gold, so I'd appreciate the info... -- | husc6!m2c!wpi!jdutka | "No matter how big a straw, you can't suck water up | | jdutka@wpi.wpi.edu | more than 34 feet." | | jdutka@wpi.bitnet | -A WPI PROFESSOR WHO WISHES TO REMAIN ANONYMOUS | | John Dutka _________|_____________________________________________________|
peter@sugar.hackercorp.com (Peter da Silva) (11/02/89)
This is the same kludge they use to get 256 colors on the ST. Me, I'll have none of it. The should be able to increase the quantization a little and do all the processing in the copper (maybe every 3 or 4 scan lines) without chewing up the whole CPU. -- Peter "Have you hugged your wolf today" da Silva `-_-' ...texbell!sugar!peter, or peter@sugar.hackercorp.com 'U` ``Back off dude! I'm a topologist!'' -- Andrew Molitor <amolitor@eagle.wesleyan.edu>
pochron@gumby.cs.wisc.edu (David Pochron) (11/03/89)
With all this discussion of 4096 colors in hires and HAM mode, would anyone
happen to know if it's possible to specify a 4-bitplane HAM mode with the
new chipset? (Already tried it with the current one, and no dice.) This
would give you 4 base colors and would allow you to use HAM mode in hires
*for real.*
The other question I have is this: I tried getting HAM mode in hires by
writing directly to the bitplane DMA data registers but either the chipset
is masking off the 5th and 6th shift registers, or the 68000 isn't fast enough
to dump 6 words (using MOVEM) into these registers. When I do this I get
an image but all it has are the base colors...no HAMming is occuring.
Has anyone else ever tried this?
-- David M. Pochron | "Life's a blit,
| and then you VBI."
pochron@gumby.cs.wisc.edu |aaron@madnix.UUCP (Aaron Avery) (11/04/89)
In article <4463@sugar.hackercorp.com> peter@sugar.hackercorp.com (Peter da Silva) writes: >This is the same kludge they use to get 256 colors on the ST. Me, I'll have >none of it. The should be able to increase the quantization a little and do >all the processing in the copper (maybe every 3 or 4 scan lines) without >chewing up the whole CPU. Peter, It's not all that simple to "increase the quantization a little". Using the copper to do this "kludge" also chews up the CPU pretty well, since it steals all of its cycles from the CPU. - Aaron -- Aaron Avery, ASDG Inc. "A mime is a terrible thing to waste." -- Robin Williams ARPA: madnix!aaron@cs.wisc.edu {uunet|ncoast}!marque! UUCP: {harvard|rutgers|ucbvax}!uwvax!astroatc!nicmad!madnix!aaron
peter@sugar.hackercorp.com (Peter da Silva) (11/06/89)
In article <955@madnix.UUCP> aaron@madnix.UUCP (Aaron Avery) writes: > It's not all that simple to "increase the quantization a little". Why not? Right now it does something on the order of: For each line: Choose color table for this line, based on color frequencies. What's wrong with: For each four lines: Choose color table for these lines, based on color frequencies. > Using the copper to do this "kludge" also chews up the CPU pretty well, since > it steals all of its cycles from the CPU. Yeh, but it's designed for this task and the opcodes are smaller. Total memory bandwidth is reduced. And if you just do it with a custom copper list for a screen it's easier to integrate with Intuition. And if you have FAST RAM, the advantage of using the copper is increased, since it only steals cycles from CHIP. -- Peter "Have you hugged your wolf today" da Silva `-_-' ...texbell!sugar!peter, or peter@sugar.hackercorp.com 'U` ``Back off dude! I'm a topologist!'' -- Andrew Molitor <amolitor@eagle.wesleyan.edu>
sean@ms.uky.edu (Sean Casey) (11/09/89)
So... does anyone have any pictures and a viewer? Perhaps an FTPable demo disk? Sean -- *** Sean Casey sean@ms.uky.edu, sean@ukma.bitnet, ukma!sean *** Copyright 1989 by Sean Casey. Only non-profit redistribution permitted. *** ``Without truth, what is there? We must never relent in our search *** for it, never cease in our criticism of what we think it is.'' -me
jimm@amiga.UUCP (Jim Mackraz) (11/10/89)
In article <4483@sugar.hackercorp.com> peter@sugar.hackercorp.com (Peter da Silva) writes:
)What's wrong with:
)
) For each four lines:
) Choose color table for these lines, based on
) color frequencies.
)
)> Using the copper to do this "kludge" also chews up the CPU pretty well, since
)> it steals all of its cycles from the CPU.
)
)Yeh, but it's designed for this task and the opcodes are smaller. Total memory
)bandwidth is reduced. And if you just do it with a custom copper list for a
)screen it's easier to integrate with Intuition.
The question is: how many color palette "move" instructions can you execute
per scanline, if the picture is severely overscanned?
jimm
--
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