From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on inbox.vuxu.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=5.0 tests=DKIM_INVALID,DKIM_SIGNED, HTML_MESSAGE,MAILING_LIST_MULTI autolearn=ham autolearn_force=no version=3.4.4 Received: (qmail 20069 invoked from network); 4 Jan 2023 00:41:46 -0000 Received: from minnie.tuhs.org (50.116.15.146) by inbox.vuxu.org with ESMTPUTF8; 4 Jan 2023 00:41:46 -0000 Received: from minnie.tuhs.org (localhost [IPv6:::1]) by minnie.tuhs.org (Postfix) with ESMTP id 8BE7942532; Wed, 4 Jan 2023 10:41:39 +1000 (AEST) Received: from mail-ed1-f42.google.com (mail-ed1-f42.google.com [209.85.208.42]) by minnie.tuhs.org (Postfix) with ESMTPS id 7850342528 for ; Wed, 4 Jan 2023 10:41:35 +1000 (AEST) Received: by mail-ed1-f42.google.com with SMTP id g1so32286982edj.8 for ; Tue, 03 Jan 2023 16:41:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bsdimp-com.20210112.gappssmtp.com; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date:message-id:reply-to; bh=7FiY0H5itV9JGQ5Awf1OslTiGwznSMpOfea8jsiMxyY=; b=Lzhg6o65qcWLGL5sTzJoALtJ/3bBcHPFjxqOD8MdTFCTFdXeGxWs7y4QoyIkbBRQAN WOrkLcOvU7NzE8+4A9XviYPGBtwHAs+1A3CKC2WR8wYB30BveyfXAOzmZPfYw9oIqmLx NVoWLI7Qql0fAi9P8qCEz6Th19nx5Mubmo6bTF8Je/ykV3U1HY6LDOtbLM96lMIqM62e 81GL8vo8PzVlwkBVP96HJU3W3l6dxMqiK4tHsQSWbhzkYpgJYcnWG7VMVFlErcQhhYML mBTz3WfqORwByNmnHVMbIUxesYaqxEFXhO3MwzLPuxqpEaVVn2kYd0ZB0j1MO2HdT9Xj gxWg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=7FiY0H5itV9JGQ5Awf1OslTiGwznSMpOfea8jsiMxyY=; b=PRnrusPlWcORfv/+eK/cbh+07dtTTfILDRjCRhzFVqwm4fRLKLNEu0GMMlZ0m02bnp M/wlVi8ggl6HA4Lbtqn7i8LKZJtoxtwNSrU+nb3V6RQpCRJ+aGg8S4bzxobwD4Yrzlys dmxGGHhQqvFW+O1dHyiaEXkouNSKRmFbV11JsWVXn+yOIT96Wa3c2XH32tvT4TXJRWyH yw1KmsmMV1U0+fxviTPEB3LRwBbaqnRWsAk+UYF5t/nt3kMZlTEKxtLynNQT5kawTxYE OAUSWAEivpTWiWSbc5Hu4ERAEQ6L6/F4jaD5Uwxg5yxVOa5iyHMafGRBlPJWjOt410aP occw== X-Gm-Message-State: AFqh2kolOMMVyqpYDdnDvuKvGY9NKB0FxtayiX7a11UQOpsE+AoBljYy 6mk87BzHzE+0Prf8U3XuJks7PyCtLSNikEyWhmzw8w== X-Google-Smtp-Source: AMrXdXuopM9yG6JIFfoy9bIqjIGHNV6Ayg2gGA2QP4mfUshmHVJSJydx2okVw8GL+11nmQJESJqM0oUpjsRS5zqu4aQ= X-Received: by 2002:a05:6402:164a:b0:482:c049:67db with SMTP id s10-20020a056402164a00b00482c04967dbmr4743965edx.173.1672792833700; Tue, 03 Jan 2023 16:40:33 -0800 (PST) MIME-Version: 1.0 References: <371F8C4D-AAAC-4CD9-9547-3A7AC0C961D0@atvetsystems.com> In-Reply-To: From: Warner Losh Date: Tue, 3 Jan 2023 17:40:22 -0700 Message-ID: To: segaloco Content-Type: multipart/alternative; boundary="000000000000a2cfb805f1656e6a" Message-ID-Hash: 44LGZRVYC3G3B77Z5JHOESQOCXAR4EMH X-Message-ID-Hash: 44LGZRVYC3G3B77Z5JHOESQOCXAR4EMH X-MailFrom: wlosh@bsdimp.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-tuhs.tuhs.org-0; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: rob@atvetsystems.com, The Eunuchs Hysterical Society X-Mailman-Version: 3.3.6b1 Precedence: list Subject: [TUHS] Re: AT&T UNIX PC (7300) Teardown and Restoration List-Id: The Unix Heritage Society mailing list Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: --000000000000a2cfb805f1656e6a Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, Jan 3, 2023, 5:30 PM segaloco via TUHS wrote: > I'd love to get my hands on a 3B2 someday, this'll be cool if I can get i= t > going but that'd be a much more robust machine. > > I'm starting to suspect if there isn't any sort of boot ROM that spits ou= t > commentary on the UART and that doesn't get flexed until UNIX is up, I ma= y > not be able to get very far. I referred to > http://bitsavers.trailing-edge.com/pdf/att/3b1/999-809-010IS_UNIX_PC_Remo= te_Access_1986.pdf > for the serial settings and it appears: > > 9600 baud, 1 stop bit, no parity, 8 data bits > > And the relevant pins > > Pin 1 - GND > Pin 2 - RX > Pin 3 - TX > Pin 4 - RTS > Pin 5 - CTS > Pin 6 - DSR > Pin 7 - GND > Pin 8 - DCD > Pin 20 - DTR > > So I've plugged my USB-TTY GND/RX/TX into the relevant pins and setup the > necessary tty settings. The manual then suggests if running null modem mo= de > to short pin 4 to 5 and then pins 6, 8, and 20 together, presumably > omitting any need for modem signalling from the remote machine, doing bas= ic > serial RX/TX. Unfortunately even with all of this bypassing I get nothing > out of the RS-232 port. What I don't know is if I could even expect > something or if this is unlikely to bear fruit whether the hardware works > or not. In any case, if I do get this thing running I'll have a writeup f= or > folks afterwards. If not, then hopefully I can figure out something usefu= l > to do with this thing rather than junking it. > Silly question... did you level shift to RS 232 levels? You likely did... but if not... Warner - Matt G. > ------- Original Message ------- > On Tuesday, January 3rd, 2023 at 3:53 PM, rob@atvetsystems.com < > rob@atvetsystems.com> wrote: > > Hello Matt, > > I=E2=80=99ve got one of these in my garage. I bought it about twenty year= s ago as > a working system but when I got it home I noticed that the hard disk wasn= =E2=80=99t > connected but at some point I=E2=80=99d like to get it and my 3b2/300 wor= king. > > Regards, Rob. > > On 3 Jan 2023, at 23:27, segaloco via TUHS wrote: > > And here are some pictures of the guts. > > https://imgur.com/a/E1ioxZl > > Various bits inside date this to late 1985. The good news is it at least > turns on, but that's about as far as I've gotten with it. The display nev= er > turns on, nor do I hear any sounds indicating it tries to start the CRT. > The fans kick on and there it stays until I turn it off. I plugged in a > USB-TTY to pins 2, 3, and 7 (RX/TX/GND) and listened at 9600 baud 8 bit 1 > stop no parity and got nothing. Swapped the RX/TX, still nothing. Of > course, that's all predicated on the assumption there's something there t= o > even interact with. I have little faith that whatever UNIX install was on > this is extant. Additionally, it didn't come with a keyboard, so if there > was some futzing with key combos that would trigger some sort of UART ove= r > those lines, I can't do that. I wonder if there are some contacts inside = I > can just poll for activity with this serial connector, not sure how safe > that is... > > Anywho, the CPU has a bit of corrosion on the surface, not sure how that > bodes for the innards, but this is in kinda rough shape either way. I hop= e > I can salvage it but if not, I'm going to at least do some study on the C= RT > particulars and see if I can extract and keep the monitor from it, been > wanting a smaller CRT to have around for a while. > > - Matt G. > ------- Original Message ------- > On Tuesday, January 3rd, 2023 at 12:20 PM, segaloco via TUHS < > tuhs@tuhs.org> wrote: > > Good day everyone, just starting a thread for yet another project I'll be > tinkering on over time. Picked up a (presumably broken/untested) 7300 off > eBay to at the very least tear down and get some good pictures of and, wi= th > some luck, perhaps get working again. > > https://imgur.com/a/CExzebl > > Here are some pictures of the exterior for starters. I'll update this > thread when I've got pictures of the guts and also with any info I can > glean regarding whether this might be salvageable. The rust on the back i= s > pretty nasty but I've seen older/worse start up just fine. > > - Matt G. > > > > > --000000000000a2cfb805f1656e6a Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Tue, Jan 3, 2023, 5:30 PM segaloco via TUHS <tuhs@tuhs.org> wrote:
I'd love to get my hands on a 3B2 someday,= this'll be cool if I can get it going but that'd be a much more ro= bust machine.

I'm starting to suspect if there isn't any sort of boot RO= M that spits out commentary on the UART and that doesn't get flexed unt= il UNIX is up, I may not be able to get very far. I referred to http://bitsavers.trailing-edge.com/pdf/att/3b1/999-809-010IS= _UNIX_PC_Remote_Access_1986.pdf for the serial settings and it a= ppears:

9600 baud, 1 stop bit, no parity, 8 data bits

And the relevant pins
=

=
Pin 1 - GN= D
Pin= 2 - RX
Pin 3 - TX
Pin 4 - RTS
Pin 5 - CTS
Pin 6 - DSR
Pin 7 - GND
Pin 8 - DCD
Pin 20 - DTR

So I've plugged my = USB-TTY GND/RX/TX into the relevant pins and setup the necessary tty settin= gs. The manual then suggests if running null modem mode to short pin 4 to 5= and then pins 6, 8, and 20 together, presumably omitting any need for mode= m signalling from the remote machine, doing basic serial RX/TX. Unfortunate= ly even with all of this bypassing I get nothing out of the RS-232 port. Wh= at I don't know is if I could even expect something or if this is unlik= ely to bear fruit whether the hardware works or not. In any case, if I do g= et this thing running I'll have a writeup for folks afterwards. If not,= then hopefully I can figure out something useful to do with this thing rat= her than junking it.

Silly question... did you level shift to RS 232 level= s? You likely did... but if not...

Warner=C2=A0

=
- Matt G.
------- Original Message -------
On Tuesday, January 3rd, 2023 at 3:53 PM, rob@atvetsystems.com <rob@atvetsystems.com> wrote:

Hello Matt,

I=E2=80=99ve got one of these in= my garage. I bought it about twenty years ago as a working system but when= I got it home I noticed that the hard disk wasn=E2=80=99t connected but at= some point I=E2=80=99d like to get it and my 3b2/300 working.

=
Regards, Rob.

On 3 = Jan 2023, at 23:27, segaloco via TUHS <tuhs@tuhs= .org> wrote:

And here are some pictures of the gu= ts.


Various bits inside date this to late 1985. The good news is it at le= ast turns on, but that's about as far as I've gotten with it. The d= isplay never turns on, nor do I hear any sounds indicating it tries to star= t the CRT. The fans kick on and there it stays until I turn it off. I plugg= ed in a USB-TTY to pins 2, 3, and 7 (RX/TX/GND) and listened at 9600 baud 8= bit 1 stop no parity and got nothing. Swapped the RX/TX, still nothing. Of= course, that's all predicated on the assumption there's something = there to even interact with. I have little faith that whatever UNIX install= was on this is extant. Additionally, it didn't come with a keyboard, s= o if there was some futzing with key combos that would trigger some sort of= UART over those lines, I can't do that. I wonder if there are some con= tacts inside I can just poll for activity with this serial connector, not s= ure how safe that is...

Anywho, the CPU= has a bit of corrosion on the surface, not sure how that bodes for the inn= ards, but this is in kinda rough shape either way. I hope I can salvage it = but if not, I'm going to at least do some study on the CRT particulars = and see if I can extract and keep the monitor from it, been wanting a small= er CRT to have around for a while.

- Ma= tt G.
------- Original Message -------
On Tuesday, January 3rd, 2023 at 12:20 PM, segaloco via TUHS <tuhs@tuhs.org> wrote:

Good day everyone, just starting a thread for yet another = project I'll be tinkering on over time. Picked up a (presumably broken/= untested) 7300 off eBay to at the very least tear down and get some good pi= ctures of and, with some luck, perhaps get working again.


Here are some= pictures of the exterior for starters. I'll update this thread when I&= #39;ve got pictures of the guts and also with any info I can glean regardin= g whether this might be salvageable. The rust on the back is pretty nasty b= ut I've seen older/worse start up just fine.

- Matt G.



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