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From: timothym@tekigm2.UUCP
Newsgroups: comp.sys.ibm.pc
Subject: Re: PCJR can it do cga (color graphics)
Message-ID: <1530@tekigm2.TEK.COM>
Date: Wed, 4-Mar-87 12:20:58 EST
Article-I.D.: tekigm2.1530
Posted: Wed Mar  4 12:20:58 1987
Date-Received: Sat, 7-Mar-87 00:48:55 EST
Reply-To: timothym@tekigm2.UUCP (Timothy D Margeson)
Organization: Tektronix, Inc., Beaverton, OR.
Lines: 30

>In response to a query by Ted Medin dated 3 Mar 87,
>>Will the jr handle cga and if not what do i need to look like cga?


Hi,

The PCjr WILL also emulate the CGA sufficient to run programs such as these:
Framework II, dBase III, Lotus, Symphony, among others... all of which will
write directly to video memory. The trick is they all look for where video
starts by reading vectors in the DOS area, so as long as this area is set up
appropriately, all works well (I think).

The trick is to use a program (actually a driver) such as CONPCJR supplied
with the Techmar side car, or the configuration program supplied with the
Racore 2nd disk expansion (which is now more reasonably priced, #2 floppy
for about $300.00, a 20meg HD for about $600.00).

Both of these add ons seem to make the PCjr work almost as well as a PC. The
big exception is the throughput, the PCjr is slower than the PC by about 30%.

No add ons I know of help the speed issue, short of changing the clock freq.,
and I have not tried that to see if it can be done (the clock in a jr seems
to be used for many things besides running the CPU).


-- 
Tim Margeson (206)253-5240
PO Box 3500  d/s C1-937                          @@   'Who said that?'  
Vancouver, WA. 98668
{amd..hplabs}cae780!tektronix!tekigm2!timothym (this changes daily)