hoffman@pitt.UUCP (Bob Hoffman) (07/08/87)
Are the schematic diagrams available for the PC7300? If so, what
does one order to get them?
I ordered the Service Manual for $150 and was EXTREMELY disappointed
to receive one small binder that gave a few troubleshooting hints
and disassembly instructions, but no schematics! I had already figured
out how to take it apart without it! I think this is the
first "Service Manual" I have ever encountered that didn't include
schematics. And the price!! I had justified it to myself that it
would be worth it to have the service information, especially if the
machine is being discontinued. I really feel as though I've been ripped
off.
I see a listing in the 3.5 upgrade kit for a Technical Reference Manual
for $300+. Having been burned for $150 for the service manual, I
hesitate to plunk down more cash just to be disappointed. Does anyone
have this manual? What's in it? Is it worth the investment?
--
Bob Hoffman, N3CVL {allegra, bellcore, cadre, idis, psuvax1}!pitt!hoffman
Pitt Computer Science hoffman%pitt@relay.cs.netdoug@marque.UUCP (07/09/87)
In article <5774@pitt.UUCP> hoffman@pitt.UUCP (Bob Hoffman) writes: >Are the schematic diagrams available for the PC7300? If so, what >does one order to get them? > >I see a listing in the 3.5 upgrade kit for a Technical Reference Manual >for $300+. Having been burned for $150 for the service manual, I >hesitate to plunk down more cash just to be disappointed. Does anyone >have this manual? What's in it? Is it worth the investment? > I am posting rather than mailing in the belief that others might find the information useful. I have the "AT&T UNIX PC Reference Manual" (999-300-1891S : can't remember if this is Com-Code or something else, but its the number on the cover: price around $300 unfortunately. It has schematics: several schematics purporting to cover the same bus in fact, but no explanation of how the signals leave the motherboard on one pin, and hit the expansion board on a different pin :--). I have a more or less complete "ohmeter" map I will mail upon request. The front page of the manual also says "A Unix PC Expansion Bus Specification" can be obtained (for the purpose of development of UNIX PC hardware enhancements) by writing: AT&T Information Systems UNIX PC Product Management 1776 on the Green Morristown, New Jersey 07960 (201) 898-6000 It also states that this manual is intended solely for use by qualified service personnel to assist in maintaining the Unix PC. (Glad I didn't get the SERVICE manual :--). Its hard to say whether I would recommend its purchase or not: it has a lot of information about some things, and is skimpy on others that seem more important (sounds like all manuals, but for $300++?). BTW for those that have asked it appears that hardware only allows a single floppy and a single hard disk: there are 3 head_select bits for the hdisk, a bit to select the hdisk, a bit to select the fdisk, a bit to turn the fdisk motor on, and one bit each to reset the fdisk and the hdisk. (I haven't confirmed this with actual wiring check yet :-). These are accessed through the "disk control register" at address 4E0000. While I "have the floor" I'll add a reply regarding a potential misunderstanding of an earlier posting of mine: my advice regarding the UnixPC at its current prices is BUY, BUY, BUY. And when you do "clean up" the software please remember me and mail or post the fixes :--). My "negative" remarks were in response to the question regarding the lack of success of the product in the marketplace, and my opinion that the "uncertain" OS is to blame. Of course having seen the hardware more carefully, it is irritating to say the least that on a machine with a 32bit processor, 99 pin expansion bus, and a carefully thought out system of hardware slots and DMA on expansion boards, they could only allocate a single lousy 8bit register to control ALL disk access: this seems especially odd on a UNIX box, with its wellknown disk demands.
gws2@cblpf.UUCP (07/09/87)
In article <5774@pitt.UUCP> hoffman@pitt.UUCP (Bob Hoffman) writes: >Are the schematic diagrams available for the PC7300? If so, what >does one order to get them? > >I ordered the Service Manual for $150 and was EXTREMELY disappointed >to receive one small binder that gave a few troubleshooting hints The Service Manual is a dog, nothing woth $150 in it. >I see a listing in the 3.5 upgrade kit for a Technical Reference Manual >for $300+. Having been burned for $150 for the service manual, I The Techinical Ref manual is what I would call a service manual. I have a copy and it has schematics, pal formuals, and a lot of board level info. The manual say that its for user who will be doing board level repairs...
dave@arnold.UUCP (Dave Arnold) (07/09/87)
In article <5774@pitt.UUCP>, hoffman@pitt.UUCP (Bob Hoffman) writes: > Are the schematic diagrams available for the PC7300? If so, what > does one order to get them? I don't know about AT&T, but Convergent Technologies has a hardware reference manual for their S/50, I have never seen it, but I was told my a distributor that it has a schematic (hearsay). The price is $100 and I think the part number is DHU-100. If anybody else has there hands on this manual, could they please post the table of contents? Dave Arnold UUCP: ...!seismo!uunet!arnold!dave