ford@crash.cts.com (Michael Ditto) (12/06/87)
In article <31200010@ccvaxa> aglew@ccvaxa.UUCP writes: >I'd like to play with my 3B1's hardware a bit, and have several questions: > >(1) What are the best manuals to get? I was recommended the Technical > Reference, but but have not yett obtained it in two months' waiting. I heard that the "Service Manual" was quite useless, and that the "Hardware Reference Manual" was the one to get. Rather than pay the hundreds of dollars that AT&T wants, I bought the Convergent S/50 version from a Convergent dealer for $75. Here's where I got it: Integrated Systems Group 920 East Broadway Glendale, CA 91205 (818) 502-1414 (order the "Convergent S/50 Hardware Reference Manual") The front cover says "Convergent S/50", but in the manual itself, only the name "AT&T Unix PC" is used. The manual contains three sets of schematics and some information about diagnostics and troubleshooting and theory of operation. It does not give a good desctiption of the expantion slots. The three sets of schematics are for the three different motherboard memory configurations. The 512K and 1Meg versions are correct, but the 2Meg schematic is missing a few pages. I was able to use the information to upgrade a 1Meg 7300 to 2Meg, though. If anybody wants a description of this procedure, let me know... I'll post if there's interest. >(2) Has anybody interfaced SCSI to the UNIX PC? I heard a rumor that someone was planning to release a SCSI card, but haven't heard of any real products. >(3) Has anybody interfaced a larger monitor? If you mean a physically larger CRT, then yes, a few people on the net claimed to have done it. >(4) Does anyone know how hard it would be to break past the 4M limit > on a process' virtual address space? Ie. use more address lines > at the MMU? This would be VERY difficult. It would require designing a replacement for the address translation custom IC, along with adding more page-table RAMs. It would require running more address bus lines to various places on the motherboard. Probably the most difficult part would be changing the system software. I would classify the job of patching the kernel to do this in the "impossible" category. Of course, if you think you can get source... -- Mike Ditto -=] Ford [=- P.O. Box 1721 ford%kenobi@crash.CTS.COM Bonita, CA 92002 ford@crash.CTS.COM
lenny@icus.UUCP (Lenny Tropiano) (12/17/87)
In article <2092@crash.cts.com> ford%kenobi@crash.CTS.COM (Michael Ditto) writes: |> [...] |> |>I heard a rumor that someone was planning to release a SCSI card, but |>haven't heard of any real products. |> The SCSI interface was released is for the 3B2 family of computers. It will allow the new 3B2/500/600 and larger animals to interface all kinds of hardware periphrials. Like 120MB tape drives, large hard drives, removables, etc... -Lenny -- ============================ US MAIL: Lenny Tropiano, ICUS Computer Group IIIII CCC U U SSSS PO Box 1 I C C U U S Islip Terrace, New York 11752 I C U U SSS PHONE: (516) 968-8576 [H] (516) 582-5525 [W] I C C U U S AT&T MAIL: ...attmail!icus!lenny TELEX: 154232428 IIIII CCC UUU SSSS UUCP: ============================ ...{uunet!godfre, harvard!talcott}!\ ...{ihnp4, boulder, mtune, bc-cis, ptsfa}! >icus!lenny "Usenet the final frontier" ...{cmcl2!phri, hoptoad}!dasys1!/