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Path: ...!Xl.tags.giganews.com!local-4.nntp.ord.giganews.com!nntp.earthlink.com!news.earthlink.com.POSTED!not-for-mail NNTP-Posting-Date: Wed, 02 Oct 2024 07:18:23 +0000 Newsgroups: comp.os.linux.misc,alt.folklore.computers X-Mozilla-News-Host: news://news.west.earthlink.net:119 From: "186282@ud0s4.net" <186283@ud0s4.net> Subject: The "Good" Old Days - Complete Specs for DX-10 Operating System Organization: wokiesux Date: Wed, 2 Oct 2024 03:18:23 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Message-ID: <Sp-dnfn-SI4ibmH7nZ2dnZfqn_ednZ2d@earthlink.com> Lines: 32 X-Usenet-Provider: http://www.giganews.com NNTP-Posting-Host: 99.101.150.97 X-Trace: sv3-FfYULz+4mmWfKuVSCVnEcw1VT9dTP0J2RZwFUY6UIgtczNQ3+eIDJNRP/mDFqH0IR9dmp3IdxPqmtdT!0bjDwHxX6CAxTPcE8qmrFCZIW243EIZTQsHs/OfbvQiHKMjrESjae91Mr84dD4IOG4l1MakXXJJ2!TtEjp8LJcVHzfRgzJTNh X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 2495 http://www.bitsavers.org/pdf/ti/990/dx10/0946250-9701B_DX10_Vol1_ConceptsAndFacilities_Apr81.pdf .. . . DX-10 was writ mostly for the TI-990 mini-computers in the mid 70s. There are a few pix in the PDF and show people with clearly mid-70s styles. The 990 series, and DX-10, were an early multi-user/ multi-tasking system aimed at the 'mini-computer' segment. Most users would have had plain terminals or graphics-capable serial terminals like from TexTronics. The 990 series used the TMS-9900 chip and near variants. This was an odd chip - kept the CPU registers out in ordinary RAM and could switch quickly between different sets of registers. At that time, the external RAM and CPU kinda ran at the same speed so little was lost putting the registers in RAM. I remember fooling with this chip on a TI-99/4a home computer (which, tragically, horribly under-used the neat new 16-bit CPU). There were ASM commands for dealing with the register, 'context', shifting. By that means many users with their own space could be implemented directly with the hardware. Anyway, the link is the full manual for DX-10 and also explains its symbiosis with the 990 hardware. How it is now AIN'T how it always was.