From: huntercr AT cs DOT purdue DOT edu (Charles Hunter)
Subject: Re: interrupt handlers
To: DJGPP AT sun DOT soe DOT clarkson DOT edu (djgpp mailing list)
Date: Sat, 18 Feb 1995 10:30:09 -0500 (EST)

> 
> 
> 
> On Fri, 17 Feb 1995, Cuthalion / Sliced Bread wrote:
> 
> > 
> > On Fri, 17 Feb 1995, A.Appleyard wrote:
> > 
> > > (A book of interrupt info that I have says that on a PCjr `AH=5, int 0x16'
> > > instead means `change keyboard layout language'. What is a PCjr and how common
> > > are they? This incompatibility between makes of PC threatens to be slightly
> > > disastrous to me.)
> > 
> > 	The PC Junior was never really popular.  It was release at around 
> > the time of the 8088 (give or take two or three years) and had a colour 
> > screen, I beleive, which was like a big thing at the time.  I have only 
> > once seen one, and that was when my high school was sending old computers 
> > (//e's, TRS-80, an original XT) to the place where computers are 
> > eternally blessed.
> > 
> > 	Don't worry about them.  By chosing DJGPP, you lose compatibility 
> > with anything below 386 (Why did I almost write that in hex?) processors, 
> > which the PC Jr certainly has.  This may be wildly inacurate, but my 
> > impression is that the PC Jr is a more gamerish XT. (I don't know where I 
> > got this idea, having never actually seen a PC Jr that was plugged in. :)

	[ it would be more accurate to describe it as a PC Jr ;-) XT's had hard
	drives.. PC's didn't ]
> 
>    Back when they were popular, I used to know someone who had one.  They 
> had CGA graphics, as I recall (didn't know it was called CGA then), and 

I believe that they had their own proprietary graphics card. The PC Jr
could do 320 X 200 with 16 colors... that is more EGA comparible
but without the high resolutions.

> they came equipped with a menu-driven program that allowed the user to 
> never have to see a DOS prompt at all (oh, goody...).  At the time, I 
Yeah.. most games self booted too.
> seem to remember that I was using a Commodore 64.  Anyway, about 

Well, as I see it, the PC Jr should have never existed because of the 
C=64. I remember comparing it to all my friends computers and the commodore 
always won.. hands down. IMHO the C=64 was greatest computer ever in existance.

> compatibility, as people have stated, you need not worry about djgpp 
> compatibility, and if you are using a different compiler, don't worry 
> anyway, most every pc jr. has been long since 'upgraded' to work as a 
> paperweight.   :-)

And for that matter, don't worry about PC's XT's AT's or half the PS/2's
either 8-)
> 

This is djgpp unrelated but some people would even tell you not to 
worry about supporting the system I am on! [ 20MHz 386sx ]  ;-)

			--Charles

P.S. I do rememeber that the PC Jr did have some good advancements 
in Technology, but just not enough to make it.
The Graphics card and  half height drives are the only thing I can 
think of right now ...hmmm...

>  -Jon
> 
>