guy@tharr.UUCP (Guy Gascoigne) (08/15/90)
I've seen various versions of the software for the Overscan mod. for an Atari ST, but nowhere have I seen a description of what is required on the hardware side. Does anyone know what needs to be done to a Mega 4 to get this to work.
arsen@sparkyfs.istc.sri.com (Tom Arseneault) (08/16/90)
In article <891@tharr.UUCP> guy@tharr.UUCP (Guy Gascoigne) writes: >I've seen various versions of the software for the Overscan mod. for an Atari >ST, but nowhere have I seen a description of what is required on the hardware >side. Does anyone know what needs to be done to a Mega 4 to get this to work. Just what is Overscan anyway??? I have a 1040STFM with a 16Mhz Jato board, 4mb memory, and both a color and mono monitor, what if anything will Overscan give me? Thank you for you support. Thomas J. Arseneault arsen@itstd.sri.com
hyc@math.lsa.umich.edu (Howard Chu) (08/17/90)
In article <32562@sparkyfs.istc.sri.com> arsen@sjc.itstd.sri.com.UUCP (Tom Arseneault) writes: >In article <891@tharr.UUCP> guy@tharr.UUCP (Guy Gascoigne) writes: >>I've seen various versions of the software for the Overscan mod. for an Atari >>ST, but nowhere have I seen a description of what is required on the hardware >>side. Does anyone know what needs to be done to a Mega 4 to get this to work. >Just what is Overscan anyway??? I have a 1040STFM with a 16Mhz Jato >board, 4mb memory, and both a color and mono monitor, what if anything >will Overscan give me? Overscan is a hardware mod that lets you use more pixels per screen. With a multisync monitor, I have 736x480 mono resolution, 832x280 med rez, and 416x280 low rez. With an SM124 monitor you can get 688x480. With an SC1224 monitor you can get 720x280 med rez & 360x280 low rez. The complete docs with illustrations are available at atari.archive.umich.edu for anonymous ftp. The files are in ~ftp/atari/utilities. o_scan60.arc contains a version that is said to work for color monitors in 60 hertz mode. (I was never able to get it working, but there may have been strange interactions with my Turbo-16 accelerator board.) The regular version plus all docs is in overscn3.arc. I included another version of the binary with my port of fractint 12. This version traps the Xbios SetScreen call, to set the correct screen dimensions when switching between low & medium resolutions. The other versions don't trap this call, resulting in garbled text displays after switching rez. My version also sets 50 hertz video mode automatically for color displays. Note that if you do get the o_scan60 version working for you, your max vertical resolution will be 224. I can live with the 50 hz screen, so I get a little more flicker but also 56 more pixel rows. -- -- Howard Chu @ University of Michigan one million data bits stored on a chip, one million bits per chip if one of those data bits happens to flip, one million data bits stored on the chip...
randyh@hpsad.HP.COM (Randy Hosler) (08/17/90)
Does this mod require TOS > 1.0? I thought I saw that somewhere. And if it does does anyone got a set of old 1.2 they want to give me? Just asking, Randy
jpickar@caticsuf.csufresno.edu (Jon Pickard) (04/30/91)
... what is the best way to lose the bottom border in 60Hz? I really do NOT want to have to switch to 50Hz because of all the flicker involved. Any help will be loudly appreciated. Note to readers of c.s.amiga.misc: yes, this IS for that helix scroller Paul Steffen mentioned. =:^) ====================================================================== || Jon Pickard || INet: jpickar@caticsuf.csufresno.edu || | | | || ||=============||======================================|| | | | || ||God?in a.s.p?|| Jeanluc Picard@Isca BBS ||smile! Your|| / | \ || ||=============|| Jeanluc@MARS Hotel ||jaw's wired|| / | \ || ||My opinions do not necessarily represent||shut! ||ST all the || ||those of the sites from which i post. || :^# ||way, bradda|| ======================================================================