Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!rutgers!sri-spam!ames!amdahl!kim From: kim@amdahl.UUCP (Kim DeVaughn) Newsgroups: comp.sys.ibm.pc Subject: Re: MS-DOS Versions Message-ID: <4626@amdahl.UUCP> Date: Mon, 15-Dec-86 16:00:39 EST Article-I.D.: amdahl.4626 Posted: Mon Dec 15 16:00:39 1986 Date-Received: Tue, 16-Dec-86 22:07:19 EST References: <1793@ncoast.UUCP> <9789@ti-csl.CSNET> Organization: Amdahl Corporation, Sunnyvale, CA 94086 Lines: 35 In article <9789@ti-csl.CSNET>, herman@ti-csl.CSNET (Herman Schuurman) writes: > > > >> Article <174200005@uiucuxc> From: karamich@uiucuxc.cso.uiuc.edu > > | No version of DOS on the market (MS or PC) that i know of will allow >640K. > > DEC Rainbows running MS-DOS have up to 896k of RAM. > > TI Professional Computers running MS-DOS have up to 768k of RAM. The > only limit that MS-DOS puts on the memory size is the 8088 1MByte limit, > although most machines running MS-DOS have some form of dedicated > memory (such as ROM and display memory) in the upper address space. My Fujitsu Micro-16s (MS-DOS 2.11) can utilize the full 1 Meg. The Fuji machine does all it's I/O using real "in" and "out" instructions. The I/O address space that's used goes to 256 bytes of dual ported RAM, which is picked-up on the other side by a 6809 micro that the box uses for it's I/O Processor. The 6809 has it's own 80k of RAM for buffers, graphics primatives, etc, and handles the tube, keyboard, RS-232 ports, timers, etc. Sure unloads alot of overhead from the 8-MHz 8086 CPU, which is one reason the performance of the machine is so good when compared to PClones. It also means that most s/w that uses other than MS-DOS system calls won't run ... or at least it wouldn't until a creative fellow up in Alaska developed a board that provides ~95% PClone compatibility! E-mail me if you are interested in this board (for Fuji's only). /kim -- UUCP: {sun,decwrl,hplabs,pyramid,ihnp4,seismo,oliveb,cbosgd}!amdahl!kim DDD: 408-746-8462 USPS: Amdahl Corp. M/S 249, 1250 E. Arques Av, Sunnyvale, CA 94086 CIS: 76535,25 [ Any thoughts or opinions which may or may not have been expressed ] [ herein are my own. They are not necessarily those of my employer. ]