test-drb September 2020

test-drb@ccmp.vtda.org

118 participants
99 discussions

Shipping via USPS Los Angeles is STALLED

by billdegnan＠gmail.com

I have a vintage computer sitting in the LA USPS since 9/17, with no further updates. I have read in the local papers there that the entire post office has ground to a halt. What's going on there? I have never heard of anything like this. I assume my package will survive but think of the zoo there if they've been stacking packages for TWO WEEKS. I'd strongly suggest not attempting to ship anything out of LA for the time being. WOW. I know people complain about the post office, I am not complaining, just stating the facts. Normally the USPS is reliable. They must really have overall problems in southern CA due to the fire and related management issues. BIll

6 years

Digitizing video frame for printing

by ljw-cctech＠ljw.me.uk

Sorry I accidentally deleted this message from Dag Spicer, so here it is for cctalk. Reply to him or the list, not me! Lawrence -------- Forwarded Message -------- Subject: Digitizing video frame for printing Date: Mon, 28 Sep 2020 06:00:21 +0000 From: Dag Spicer via cctech <cctech at classiccmp.org> Reply-To: Dag Spicer <dspicer at computerhistory.org>, General Discussion: On-Topic Posts <cctech at classiccmp.org> To: cctalk at classiccmp.org <cctalk at classiccmp.org> Hi there, Trying to help a former operator of a digital portrait scanning booth ?back in the day?? He writes: ++++ IN 1976, I worked at "get your portrait by computer" store. The heart of the system was a 16 bit, Data General, Nova II computer. A black and white, analog, standard definition CCTV camera was tethered to a "digitizer" box that was connected to the computer. The photographer hit the ?Capture? button on the "Digitizer" box to instantaneously freeze the image and "digitize" it. The image was then sent to a Centronics, 102AL, 7 pin, dot matrix printer to print. A perceived grey scale of 26 shades was created by numbers and letters. What I am trying to find out is what the "Digitizer" box was and how it worked. Ram? Tape loop? I DO know that it said 'Digital Image Systems' on the outside but have not been able to learn more. ++++ Can anyone help with more information about DIS or generically about these systems? They were popular in shopping malls for a few years in the mid-70s? Thanks for any tips! Dag ?? Dag Spicer Senior Curator Computer History Museum 1401 N. Shoreline Blvd. Mountain View, CA 94043 dspicer at computerhistory.org<mailto:dspicer at computerhistory.org>

6 years

5.25" analog alignment floppy disk

by ccth6600＠gmail.com

I have two poorly aligned 5.25" floppy drives. They read/write disks formatted by themselves but are marginal on disks formatted by other drives. Rather than using a crude "good enough" alignment I would like to do this properly. Is there still a supplier for 5.25" analog alignment floppy disks? Thanks Tom Hunter

6 years

SCP/Microsoft 20HAL uploader

by rich.cini＠gmail.com

All ? I?ve done a quite a bit of work with my Seattle Gazelle, and I just did some work on 86DOS.SYS (not released in source form, as far as I know) and its comparison to PC DOS 1.0 (at the code level, a very high correlation as you can imagine). Partially related to that is a program called ?20HAL? which was a code uploader Microsoft used in the late stages to get code from Microsoft in Bellevue to IBM in Boca Raton, FL. I did a little write-up on it here (http://www.classiccmp.org/cini/hal.htm) There are some holes in the analysis ? I think it?s pretty close, though -- but I?d really like to get some more details on it. Unfortunately, it?s 40-year-old code at this point, and how many people remember how they used a file transfer utility that long ago? Anyway, enjoy the read. If anyone sees any corrections that need to be made, let me know. Thanks! Rich -- Rich Cini http://www.classiccmp.org/cini http://www.classiccmp.org/altair32

6 years

Disabling SCSI parity checking to dump disk on ACB4000 MFM-SCSI adapter?

by engel＠multicores.org

Hi, still working on backing up the Tektronix 440x disks. My current problem is that the ACB4000 SCSI-to-MFM adapter doesn?t support SCSI parity. I finally managed to find a PCI SCSI controller (Adaptec 2940) and a Pentium 4 PC with PCI slots and installed OpenBSD 6.7. I disabled parity checking in the Adaptec BIOS config and it detects a disk at ID 0 with no name. So far, so good. However, OpenBSD always seems to enable SCSI parity and complains about disk parity errors. I tried to disable all lines in the aic7xxx and ahc_pci driver source files that seem to enable parity, but nothing seems to make a difference. The drive/ACB4000 is not detected by OpenBSD, I get a "device not configured" error when accessing the disk device files (/dev/sdxc and /dev/rsdxc). Do you know if is there another OS which would make it easier to change crucial SCSI parameters in the driver (config) or maybe a specialized tool that could help me to image the disk? -- Michael

6 years

Alpha Micro goes gopher

by spectre＠floodgap.com

(also posted to VCF) If you'd like a longer story version, I posted this in long form with some pictures: https://oldvcr.blogspot.com/2020/09/hacking-gopher-client-into-alpha-micro.… I've hacked up a Gopher client into the Alpha Micro. It requires AMOS 2.3A and either AlphaTCP 1.3C or 1.5A, and is written in both assembly (using a hacked version of the AlphaTCP finger client) and AlphaBASIC. gopher://gopher.floodgap.com/1/archive/alpha-micro/gopher And why would I do this, other than the fact I like Gopherspace? Because I've also uploaded the Alpha Micro Users' Society Network Library to the Floodgap gopher server, with oodles of free binaries and source code lovingly preserved in their original PPNs. gopher://gopher.floodgap.com/1/archive/alpha-micro/amus (No Gopher client? Visit https://gopher.floodgap.com/overbite/ to download one, or view it on the proxy: https://gopher.floodgap.com/gopher/gw?gopher://gopher.floodgap.com:70/1/arc… ) And, if you want to know more about Alpha Microsystems, the Alpha Micro Phun Machine has been updated as well: http://ampm.floodgap.com/ -- ------------------------------------ personal: http://www.cameronkaiser.com/ -- Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com -- Seen on hand dryer: "Push button for a message from your congressman." -----

6 years

dec tk50z-ga issues

by plamenspam＠afterpeople.com

Hi all, Since I don't have a machine with qbus and I need to backup some vms and ultrix tk50 tapes, I purchased a tk50z-ga from ebay. Upon power up, the red led flashing rapidly(which means drive fault) then goes to solid red. I've never used TK50 drives in the past so if you have any hint how to troubleshoot this it would be appreciated. Or should I start looking for a replacement? Regards, Plamen

6 years

Tektronix PDP-11 Signal Processing System BASIC 1980

by aek＠bitsavers.org

Just recovered these RX01 diskettes today ca. 1980 http://bitsavers.org/bits/Tektronix/SPS_BASIC manuals http://bitsavers.org/test_equipment/tektronix/wdi

6 years

TRS-80 Trash Talk Live #7

by pete＠pski.net

We?re having another TRS-80 Trash Talk online gathering tomorrow. Everyone is welcome to join us! https://www.trs80trashtalk.com/2020/08/trs-80-trash-talk-live-7-is-coming-o… <https://www.trs80trashtalk.com/2020/08/trs-80-trash-talk-live-7-is-coming-o…> Thanks, Pete

6 years

Disabling SCSI parity checking to dump disk on ACB4000, MFM-SCSI adapter?

by syseng＠gfsys.co.uk

On 09/24/20 18:00, cctech-request at classiccmp.org wrote: > Disabling SCSI parity checking to dump disk on ACB4000 > MFM-SCSI adapter? I have a sun 3 system with acb4000 and suspect the protocol was not fully sorted in that time frame. They can be fussy about what they will talk to, ime. Would lend a hand if you are in the uk, but otherwise, if you have an early Sparc system, I would try that, as it would probably still support the older controllers. Sparcstation 1 or 2 + Sunos probably has the required entries in the format utility, format.dat file. An early pci or isa Adaptec card might be worth trying as well, under Suse 11.4 or similar, as that has a good disk utility... Chris

6 years

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test-drb September 2020