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[108.20.187.173]) by smtp.gmail.com with ESMTPSA id 189sm18230168qkh.9.2018.12.30.18.43.46 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 30 Dec 2018 18:43:47 -0800 (PST) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (1.0) From: Clem cole X-Mailer: iPhone Mail (16C101) In-Reply-To: Date: Sun, 30 Dec 2018 21:43:45 -0500 Content-Transfer-Encoding: quoted-printable Message-Id: <7AEB778A-EBC9-4A89-8E3B-A771FF5FC9B3@ccc.com> References: To: Will Senn Subject: Re: [TUHS] Upgrading from 11/40 to 11/45 in Unix v6 X-BeenThere: tuhs@minnie.tuhs.org X-Mailman-Version: 2.1.26 Precedence: list List-Id: The Unix Heritage Society mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: tuhs@tuhs.org Errors-To: tuhs-bounces@minnie.tuhs.org Sender: "TUHS" The primary difference between the 11/40 class and 11/45 class is separate I= /D space which I sometimes refer to as the 17th address bit because it allow= s you a full 64k of data space as well as a 64k of instructions space. =20 After you are booted, a 45 class machine will run 40 class binaries unchange= d. 40 class machines can not run a.outs that are seperate I/D You=E2=80=99ll probably want to configure a kernel for the 45 class machine.= Look at the differences in the *.s files in the kernel. IIRC there is a di= fferent file for 40 class and 45 class systems That said if you running the simh I would recommend going all the way to an 1= 1/70 configuration because you can set it up for 4M of main memory. Clem Sent from my PDP-7 Running UNIX V0 expect things to be almost but not quite.= =20 > On Dec 30, 2018, at 9:25 PM, Will Senn wrote: >=20 > Dear Unix Enthusiasts, >=20 > We are seriously considering upgrading our PDP 11/40 clone (SIMH), to a PD= P 11/45 (preferably another SIMH) for our Unix v6 installation. Our CEO was t= raveling and met a techie in first class (seriously, first class?) who told h= im that we needed one. I thought I had better ask some folks who have gone b= efore about it before we jumped on the bandwagon. By way of background, Our i= nstall is pretty small with a few rk=E2=80=99s and 256K of ram along with a f= ew standard peripherals, and some stuff our oldtimers refuse to part with (p= apertape, card punch, etc). It has fairly low utilization - a developer logs= in and writes code every few days and the oldtimers hunt the wumpus and pla= y this weird Brit game about cows. It could be considered a casual developme= nt and test environment and an occasional gaming console. >=20 > Here is what I would like to know that I think y=E2=80=99all might be part= icularly equipped to answer: >=20 > 1. Are there any v6 specific concerns about upgrading? >=20 > 2. Why should we consider taking the leap to the 11/45? Everything seems t= o work fine now. >=20 > 3. If we jump in and do the upgrade, how can we immediately recognize what= has changed in the environment? I.e what are some things that we can now do= that we couldn=E2=80=99t do before? >=20 > 4. If we just insert our current diskpacks into the new system, will it ju= st boot and work? Or what do we need to before/after booting to prepare/resp= ond to the new system? >=20 > 5. Is 256K enough memory or what configuration do y=E2=80=99all recommend?= >=20 > 6. Is there anything else we need to know about? >=20 > Regards, >=20 > Will >=20 > Sent from my iPhone