test-drb November 2018

test-drb@ccmp.vtda.org

150 participants
133 discussions

by robert.jarratt＠ntlworld.com

I am still working on the causes of a Reset on my Pro 350. One 8-pin DIP chip that I have traced to is marked as follows: 9643TC-B1 F 8313 KOREA It is very close to the F-11 chips at the bottom left and marked E135 in this picture https://rjarratt.files.wordpress.com/2018/10/system-board-labelled.jpg Can anyone tell me what this is? Thanks Rob

6 years, 1 month

Font for DEC indicator panels

by jnc＠mercury.lcs.mit.edu

> We're just about settled on the format for the QSIC RKV11-F/RPV11-D > panels. PS: Here's the latest rev of our thinking: http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/jpg/inlay-rk11-f3.pdf if anyone has any comments. (Since the format is entirely set by the FPGA, it's 'easy' to tweak it, if there's a desirable improvement.) It's not the same as the old DEC RK11-B/RK11-C or RP11-C inlays, in part because we want to be able to show the address, and on a QBUS machine, that's 22 bits. Also, many of the fields don't apply to the QSIC (e.g. internal drive signals, 36-bit data buffer on the RP11, etc); we figured it would be better to recycle those lights for something useful (e.g. the address and word count). Noel

6 years, 1 month

IP address classes vs CIDR (was Re: Reviving ARPAnet)

by jnc＠mercury.lcs.mit.edu

> From: Eric Smith > which would respond to ARP requests for non-local addresses and reply > with the router's MAC address (on that interface), specifically in > order to make classful-only hosts work on a CIDR network. Yeah, Proxy ARP (an early RFC here: https://www.rfc-editor.org/rfc/rfc1027.txt but IIRC it was people at CMU who first came up with the idea; this RFC is >from people at UT-Austin, documenting it) was originally done to support subnetting (see https://www.rfc-editor.org/rfc/rfc917.txt for more) when it was first introduced - for hosts for which people didn't have the source, but needed to attach it to a subnetted network. Subnetting was a stage before CIDR (which took subnetting and Carl-Herbert Rokitansky's 'supernetting' and mushed them together). Noel

6 years, 1 month

Rugged Nova

by erik＠baigar.de

Hi Jeffrey, thanks for your answer and recollections on the famous hammer test ;-) > hangar. I was mesmerized as two weights were released from two chains > on opposite sides of the machine as it was running. The two weights There is a youtube video showing some of the testing... https://www.youtube.com/watch?v=_oOgYklBklc ..but the hammer is not hitting the device under test directly, but it is hitting a big steel plate where the device is mounted to (indeed simulating a submarine in harsh "conditions")... > up the Liberty bell, or crashed a VW into a lightpole. The machine > continued to function! Yes, lot of metal inside those Rolms. Although all Aluminium, they are veeery heavy and I always wondered how many of them also have been used in airborne applications, where weight is an issue ;-) Best wishes, Erik.

6 years, 1 month

Sun doc: "Writing Device Drivers for the Sun Workstation"

by cclist＠sydex.com

I discovered this one (Document 800-1304-05, 19 September 1986 Still in shirnk-wrap, so pristine. I offered it to Al, but got no response. FFS USA --Chuck

6 years, 1 month

New to System/36

by alan＠alanlee.org

Just picked up an IBM System/36 5362 tonight. It is in pretty good physical condition with just a few minor scratches - other than needing a thorough cleaning. It has 2 60 MB hard disks in the unit. Not sure of the RAM capacity. Missing the the mode hard key. A few of us tried to get it running tonight. It came with a 3179 twin-ax terminal but no keyboard. We connected the terminal via a twinax cable direct from port 0 to the terminated Y adapter on the terminal. Never got any output on the terminal at any time other than the fairly empty status line. The S/36 front panel console light did illuminate after we connected the terminal. The key was locked to Normal but we were able to by-pass it with a jumper to get it into Service mode. The media that came with it only had disk 1 of an SSP release and we could not get that to IPL from floppy (mode 3 / panel 1000). It stepped the head motor forward and back a couple times, engaged the head, then immediately threw an error code. Any idea where I can get an SSP release for the S/36 5362 and how to write it to 8" floppies? Also where I might find a keyboard for the terminal and what can be done if anything to gauge the health of the hard drives? -Alan H.

6 years, 1 month

Did anyone see Vintage Tech Hunters on Discovery Canada yet?

by coreyvcf＠gmail.com

Can?t see it yet in the states, but I was wondering if anyone here saw it and what you though. I was involved with the show. Thanks, Cheers, Corey corey cohen u??o? ???o? Sent from my iPhone

6 years, 1 month

NeXT Monitor Problem

by kylevowen＠gmail.com

I've got a NeXTstation Turbo and a MegaPixel display; the computer boots fine, but seems to complain of a failing hard drive. The monitor works okay; slight burn in, but otherwise looks okay in terms of the phosphor. However, something seems to be wonky with the horizontal scan...the left edge is very wobbly. Pictures here: https://imgur.com/a/azWHVuB Before I open this up, does anyone have any suggestions on where to start? I didn't see a NeXT section on Bitsavers. I am aware of the dangers of CRTs and will be sure to discharge the anode; I've worked on a few MDA monitors before. Thanks! Kyle P.S. From the hard disk error message, would you agree it's failing? Would this indicate total failure is imminent?

6 years, 1 month

ISA sound and video cards, and PCI? AGP?

by sales＠elecplus.com

My recycler in Chicago will hunt some down for me. Tested and working, they will be about $25 each. Sound reasonable? May have slight cosmetic defects due to coming from recycler, bit I will test all the functions. I knew there must be some reason I saved all those old floppies! Do you guys want PCI cards too? Same price? AGP video cards? Cindy Croxton --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

6 years, 1 month

CBIS Network OS

by pat＠vax11.net

I saw a copy of this pop up on ebay, and was wondering if anyone had a copy / more information about it? It seems to be another networking OS for CP/M systems like Televideo's TS-806 & 816. Thanks, Pat

6 years, 1 month

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test-drb November 2018