Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!rutgers!sri-spam!mordor!lll-tis!ames!ucbcad!ucbvax!MGHCCC.HARVARD.EDU!smith%eri.DECnet From: smith%eri.DECnet@MGHCCC.HARVARD.EDU ("ERI::SMITH") Newsgroups: comp.os.vms Subject: Loading the 2 planes of a VT240 using sixels Message-ID: <8706292353.AA16921@ucbvax.Berkeley.EDU> Date: Mon, 29-Jun-87 12:42:00 EDT Article-I.D.: ucbvax.8706292353.AA16921 Posted: Mon Jun 29 12:42:00 1987 Date-Received: Wed, 1-Jul-87 03:37:27 EDT Sender: daemon@ucbvax.BERKELEY.EDU Reply-To: "ERI::SMITH" Distribution: world Organization: The ARPA Internet Lines: 32 I have been trying to use the 2 bitplanes of the vt240 to display a grey-scale image that has been thresholded to contain only 4 levels (00, 01, 10, 11). According to the VT240 programmers reference manual, the beast has 2 bitplanes. It is obvious that there actually is 2 bitplanes since I have observed blank, low intensity, medium intensity and high intenstiy graphics on the screen. I am downloading the image to the vt240 using sixels. I have verified however, that when I download the sixel data, it is going into both bitplanes, and therefore I am only getting 00 and 11 as my levels. Therefore, I thought that if I go into ReGIS mode and mask the appropriate planes (using the ReGIS W(F0-3) commands), I can allow writes to plane 0 only send the 1st bitplane allow writes to plane 1 only send the second bitplane. Unfortunately, every time I exit ReGIS mode and go back into sixel mode, the screen is erased !! I actually have done a 4 level display using ReGIS, however this method is SIXTY times slower than sixels. I am hoping that someone can tell me how to do it using sixels. ---------------------------------------------------- Bob Goldstein goldstein%eri.decnet@mghccc.harvard.edu Eye Research Institute of Retina Foundation 20 Staniford St Boston, MA 02114 (617) 742-3140 x404 ------ ------ ------