friedman@athos.rutgers.edu (Gadi ) (09/08/88)
Can someone please explain what the difference is between the RGB
formats used in the following computers.
Apple IIc
Apple IIGS
MAC II
IBM CGA
IBM EGA
IBM VGA
AMIGA
I know that some of these are Digital, some are Analog, some have
9 pins or 12 pins etc.
Thanks
Gadi
--
uucp: {ames, cbosgd, harvard, moss}!rutgers!aramis.rutgers.edu!friedman
arpa: FRIEDMAN@ARAMIS.RUTGERS.EDUTMURPHY@wpi.BITNET (09/10/88)
I don't know about all the formats, but know a bit. The IIc is composite,
not RGB, video. I don't know about the IIGS or Amiga. The Mac II is
analog RGB I believe, as is the PC's VGA mode. CGA and EGA are digital,
but use different scan rates due to resolution. I have a Mitsubishi
Diamond Scan monitor, which can display any of these formats. Other
such monitors exist, most notably the NEC Multisync.
________________________________________________________________
Thomas C. Murphy Worcester Polytechnic Institute CAD Lab
Mechanical Engineering Dept.
BITNET: TMURPHY@WPI
Arpanet: tmurphy%wpi.bitnet@talcott.harvard.eduSEWALL@UCONNVM.BITNET (Murph Sewall) (09/10/88)
>I don't know about all the formats, but know a bit. The IIc is composite, >not RGB, video. I don't know about the IIGS or Amiga. The Mac II is Whoa - one of the selling points of the //c is the "built in" RGB port (I've never used it, but I understand it requires some sort of adapter available from Video-7). The //c is, in any case, digitial RGB while the IIgs (and the Amiga I think) is analog. Common RGB cards for the //e are digital; I havne't heard of an analog card for the //e (don't even know if such a thing is possible, but I suppose it is). >analog RGB I believe, as is the PC's VGA mode. CGA and EGA are digital, Yup, PS/2's VGA is definitely analog. >but use different scan rates due to resolution. I have a Mitsubishi >Diamond Scan monitor, which can display any of these formats. Other >such monitors exist, most notably the NEC Multisync. Murph Sewall Sewall@UCONNVM.BITNET Business School sewall%uconnvm.bitnet@mitvma.mit.edu [INTERNET] U of Connecticut {rutgers psuvax1 ucbvax & in Europe - mcvax} !UCONNVM.BITNET!SEWALL [UUCP] -+- My employer isn't responsible for my mistakes AND vice-versa! (subject to change without notice; void where prohibited)
SEWALL@UCONNVM.BITNET (Murph Sewall) (09/10/88)
>Recently, I was told that the IIc RGP "adapter" from >the third party is no longer available. I think that the video out was Too bad, I wonder if there are any substitutes? >composite and that this device separated the composite video into >digital RGB signals for use with such a monitor (all hearsay). In any Now that I'm home and can inspect my //c, I have my "Color Monitor //c" pluged into the composite jack. Right next to it is a 15 pin "female" under an icon of a monitor screen with 3 dots in a triangle (signifying an RGB outlet). One would suppose that that outlet should produce a signal appropriate for an existing (what? a monitor ONLY from Apple for twice the price of everyone elses?) RGB monitor. Surely someone in our happy band of readers actually has an RGB monitor connected to a //c and can shed some light on how it's done? Murph Sewall Sewall@UCONNVM.BITNET Business School sewall%uconnvm.bitnet@mitvma.mit.edu [INTERNET] U of Connecticut {rutgers psuvax1 ucbvax & in Europe - mcvax} !UCONNVM.BITNET!SEWALL [UUCP] -+- My employer isn't responsible for my mistakes AND vice-versa! (subject to change without notice; void where prohibited) "We have met the enemy and they are us!" Pogo (Walt Kelly)
jetzer@studsys.mu.edu (jetzer) (09/10/88)
In article <8809100137.aa15611@SMOKE.BRL.MIL>, SEWALL@UCONNVM.BITNET (Murph Sewall) writes: > a 15 pin "female" > under an icon of a monitor screen with 3 dots in a triangle (signifying > an RGB outlet). One would suppose that that outlet should produce a > signal appropriate for an existing (what? a monitor ONLY from Apple for > twice the price of everyone elses?) RGB monitor. > Surely someone in our happy band of readers actually has an RGB monitor > connected to a //c and can shed some light on how it's done? I don't have an RGB monitor on my //c (don't even have a //c), but I may be able to shed some light. The following diagram is reproduced without permission from page 250 of *The Apple //c Reference Manual*: 8 1 o o o o o o o o o o o o o o o 15 9 Pin Signal --- ------ 1 TEXT 2 14M 3 SYNC* 4 SEGB 5 1VSOUND 6 LDPS* 7 WNDW* 8 +12V 9 PRAS* 10 GR 11 SEROUT* 12 NTSC 13 GND 14 VIDD7 15 CREF Hope this helps -- Mike Jetzer "Hack first, ask questions later."
larry@pdn.UUCP (Larry Swift) (09/12/88)
In article <8809091620.aa10755@SMOKE.BRL.MIL> SEWALL@UCONNVM.BITNET (Murph Sewall) writes: >.... Common RGB cards for the //e >are digital; I havne't heard of an analog card for the //e (don't even >know if such a thing is possible, but I suppose it is). This is something I've been wondering about for some time. I have a Microtek Rainbo 256, which (I thought) outputs to an analog RGB monitor. On the other hand, perhaps the 8-bit format color code given to the card by the program is just passed thru to the monitor? I wonder just what the "digital" vs "analog" formats are for these two types of monitor? Is the video image itself digitized in the interface to a digital monitor? Larry Swift UUCP: {peora,uunet}!pdn!larry Paradyne Corp., LF-207 Phone: (813) 530-8605 P. O. Box 2826 Largo, FL, 34649-9981 She's old and she's creaky, but she holds!
tmetro@LYNX.NORTHEASTERN.EDU (09/19/88)
Murph Sewall <SEWALL@UCONNVM.BITNET> writes: > ...a 15 pin "female" [connector] under an icon of a monitor screen with > 3 dots in a triangle (signifying an RGB outlet). One would suppose that > that outlet should produce a signal appropriate for an existing (what? a > monitor ONLY from Apple for twice the price of everyone elses?) RGB monitor. > Surely someone in our happy band of readers actually has an RGB monitor > connected to a //c and can shed some light on how it's done? That connector is not an RGB outlet. It is a port that provides the video information for external adaptors. The most common adaptor being a TV modulator. I would guess that an RGB adaptor would be possible, but the latest Apple //c Reference Manual makes no mention of the availability of either an RGB adaptor or an RGB monitor. ___________ ./ Tom Metro \_____________________________________________________________. | _ _ | | INET: tmetro@pro-angmar.uucp --/\/\_| |_| '- DigiTell, Inc. | | ARPA: crash!pnet01!pro-angmar!tmetro@nosc.mil Newton, MA | | UUCP: [ihnp4 sdcsvax nosc]!crash!pnet01!pro%angmar!tmetro | |_Alternate: tmetro@lynx.northeastern.edu__________________________________|