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From: sob@neuro1.UUCP (Stan Barber)
Newsgroups: net.micro.trs-80
Subject: Re: What makes the Model 4 work?
Message-ID: <661@neuro1.UUCP>
Date: Sat, 9-Nov-85 01:16:56 EST
Article-I.D.: neuro1.661
Posted: Sat Nov  9 01:16:56 1985
Date-Received: Sun, 10-Nov-85 09:36:18 EST
References: <405@houem.UUCP>
Reply-To: sob@neuro1.UUCP (Stan Barber)
Organization: Neurophysiology, Baylor College of Medicine, Houston, Tx
Lines: 18

Well, you are right that you can push info out to certain ports to make
things happen. And it does not require disks to do this, but it is
hard to use 64K of ram that is empty. Once you do the ROM swapout, there
is no way to load the ram with anything. The boot code only works with
the disk drives on the standard Model 4 although I understand that is
different on the 4P (and may be on the new 4D).

You cannot use the 4 in III mode with the 80x24 screen without a special
driver to cause all the video mapping to happen right. Real tricky. I know
come  word processing software that does this (LeScript, I belive), but
otherwise, hard to do.

Sorry this is such a downer.

-- 
Stan		uucp:{ihnp4!shell,rice}!neuro1!sob     Opinions expressed
Olan		ARPA:sob@rice.arpa		       here are ONLY mine &
Barber		CIS:71565,623   BBS:(713)660-9262      noone else's.