Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10 5/3/83 based; site houem.UUCP Path: utzoo!watmath!clyde!cbosgd!ihnp4!houxm!houem!marty1 From: marty1@houem.UUCP (M.BRILLIANT) Newsgroups: net.micro.trs-80 Subject: Again: What makes the Model 4 work? Message-ID: <408@houem.UUCP> Date: Mon, 11-Nov-85 17:02:18 EST Article-I.D.: houem.408 Posted: Mon Nov 11 17:02:18 1985 Date-Received: Tue, 12-Nov-85 04:57:20 EST Organization: AT&T Bell Labs, Holmdel NJ Lines: 26 As long as sob@neuro1.UUCP (Stan Barber) has replied on the net to my question about how to access the special features of the Model 4 when I only have a cassette system, let me continue: Stan says "... you can push info out to certain ports to make things happen.... 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.... 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.... Sorry this is such a downer." OK, no problem! I just want 80x24 for my terminal emulator. It has its own screen driver, it uses ports for RS-232, and I can copy a keyboard driver. The Model III screen and keyboard maps are in the part of the address space that goes away in Model 4 mode, so I have to know what to do instead. But I have the source for the terminal program. I can hack what I need, load it from cassette in Model III mode, let it swap into Model 4 mode, and run! So, I'm still asking Stan or anybody else: what info goes through what ports to get into, use, and get back from Model 4 mode? M. B. Brilliant houem!marty1 39 McCampbell Road Holmdel, NJ 07733 (201)-946-8147 AT&T-BL Holmdel, NJ (201)-949-1858