Path: utzoo!censor!hugh
From: hugh@censor.UUCP (Hugh D. Gamble)
Newsgroups: comp.sys.amiga
Subject: Re: Amiga 2000HD with NEC multisync II won't boot
Summary: composite sync works now.  Still with ECS?
Message-ID: <366@censor.UUCP>
Date: 26 Feb 89 10:12:44 GMT
References: <9577@louie.udel.EDU> <3397@amiga.UUCP>
Organization: Bell Canada, Business Development, Toronto
Lines: 58

In article <3397@amiga.UUCP>, jimm@amiga.UUCP (Jim Mackraz) writes:
] In article <9577@louie.udel.EDU> Tollefson (Jon_Tollefson_) writes:
] )
] )I recently bought an NEC multisync II monitor.  It came with a cable for
] )connecting to an IBM.  I had a local dealer wire one of the cable ends to
] )plug into the Amiga.  But now the hard disk (autoboot) won't boot when the
] )monitor is connected to the computer.  The monitor will flash a couple of
... 
] You're going to need more information than I can give you, but the basic story
] is this.  The NEC cable is connecting to two signals, horizontal and vertical
] sync, that typically aren't used.  There function is combined on a single pin
] called composite sync which is normal for common monitors.

There are a couple of ways of cabling the NEC MS II that should work.  It
has both separate H & V sync, and a composite sync.  The cable hooking mine
to my A2000 uses the composite sync and works perfectly.

...
] The trick is to install a "buffer on the sync lines" on the Amiga end of
] the cable.  It's a single cheap chip, but has to be hooked up in there somehow.

My cable using the composite sync doesn't add a buffer.  I had heard that
some other multisync monitors required buffering to solve this problem.
  
> This problem (and adapted cables) will soon be in abundance, since to benefit
> from the new modes of the Enhanced Chip Set, you need to hook up a multi-frequency
> monitor to hsync and vsync.

I'm not a hardware guy, could someone explain whether having the composite
sync hooked up instead of the separate sync will cease to work with the
new modes of the ECS?  Will the NEC MS II need the extra buffer chip 
for the separate sync lines?  The extra few bucks for a cable adapter
doesn't matter to me, I'd just like to know.

... 
> Perhaps someone has an online version of the description, or the address
> of someone who will solder you one up.  It will probably be best marketed
> as a 23-9 pin connector (or whatever is on the end of the NEC cable), so
> if you hacked the end off your cable and stuck on a 23 pin, it's solderin'
> time.

The NEC MS II comes with a 9 pin end, and a 15 pin adapter for PS/2
connection.

...
> 	jimm
> 
> -- 
> Jim Mackraz, I and I Computing	   	"Like you said when we crawled down
> {cbmvax,well,oliveb}!amiga!jimm          from the trees: We're in transition."
> 							- Gang of Four
> Opinions are my own.  Comments are not to be taken as Commodore official policy.


-- 
Hugh D. Gamble  (416) 581-4354  {lsuc, utzoo}!censor!hugh  (Std. Disclaimers)
I don't want to live in a beer commercial,
I just want to play with some of the girls from one. :^)