Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.3 alpha 4/15/85; site neuro1.UUCP Path: utzoo!watmath!clyde!cbosgd!neuro1!sob 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.