home *** CD-ROM | disk | FTP | other *** search
- Path: daily-planet.execpc.com!usenet
- From: jeffsj@execpc.com (Jeffery S. Jones)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: Amiga 4000 Monitor question
- Date: 14 Feb 96 23:51:10 +0000
- Organization: Exec-PC BBS - Milwaukee, WI
- Message-ID: <2339.6618T1431T531@execpc.com>
- References: <4fr0ff$c4o@kasey.umkc.edu>
- NNTP-Posting-Host: ursamajor.execpc.com
- X-Newsreader: THOR 2.22 (Amiga;TCP/IP) *UNREGISTERED*
-
- On 13-Feb-96 21:39:59, KOHN <s956550@jinx.umsl.edu> wrote:
- >i just got an Amiga 4000 a few months ago and need help finding a monitor
- >to use with it. I want a multisync but i need the interlace modes for doing
- >video work and stuff. If i buy a multisync that says it's a non-interlaced
- >monitor, will it do the interlaced modes correctly? or if i buy an
- >interlaced monitor, will it hold a non-flickering 640x480 VGA picture? I
- >tried hooking up an EGA monitor and it did all the modes correctly except for
- >the interlaced modes came out wrong (i made a cable that ignored the unused
- >VGA signals). Oh yeah.. and i have a Sync Strainer adapter to hook up the
- >monitor (which i don't really know what it is.. but it came with the computer
- >:)
-
- An Amiga 4000 needs a multisync monitor with a horizontal sync range of 15khz
- to 35khz, and vertical of 50Hz to 90 Hz.
-
- The 15khz at 50-60Hz range is critical, as it is the default output, used by
- many games, the OS itself, and is required in order to set up the system to use
- other display modes.
-
-
- Interlace means that the video image is displayed in two separate fields per
- frame, alternating. Interlace will always flicker more than non-interlace at
- the same refresh rate (vertical sync).
- However, what is called interlace on an SVGA monitor is a 90Hz rate, which is
- much less annoying than the 60Hz (or 50Hz) interlace rate used on the Amiga.
-
- Interlace, in and of itself, isn't necessarily bad. The flicker effect is
- emphasized by the use of high contrast lines and colors. Television is
- interlaced, 60Hz or 50Hz, 15khz (same as the Amiga ;)).
-
- The Sync Strainer is an adapter needed to use a multisync monitor with an
- internal Genlock, such as the Video Toaster. It also serves as a 23 to 15 (or
- 9) pin video adapter.
-
- Most monitors labeled SVGA, and many modern multisync monitors, cannot do
- 15khz, and thus are very difficult to use on an Amiga. You'll have to have a
- different monitor in order to set up the system, and if you ever run anything
- that forces a 15khz display (most self-booting games, for example), the display
- won't work.
-
-
- <tsb> | *Starfire* |
- *-___________________________________________________________________-*
- Jeff Jones email:jeffsj@execpc.com *//* Amiga Lives!
- *TFG*Starfire*Design*Studio* *\\//* 1985-1994, born again 1995!
- --
-
-