- cctalk - classiccmp.org

by Cory Heisterkamp

Too far north for me, but hopefully it doesn't get scrapped out. No relation. -C https://bid.schmalzauctions.com/Vintage-The-CompuWritter-IV_i60266313

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System/38 update

by Joe George

We've been working on restoring and powering up a fairly rare bird of IBM Midrange machine, the IBM System/38. We had some good success this past weekend that I'd like to share. https://crusty.computer/?p=89 June Work Recap: Edith – The Crusty Computer Club crusty.computer tl;dr: she powered up and no smoke came out and no sparks came out! There are several repairs needed but they are known and fixable.

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Intel 3086

by Murray McCullough

Intel's x86 technology as in the 8086 came into existence for the microcomputer-user at this time back in June 1978. It was a response to Motorola's and Zilog's move to 16-bit processing. Still in use today...the basic tech so to speak. Can it be unseated by RISC(Apple and such) and Nvidia? Happy computing. Murray 🙂

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Burroughs DCALGOL vs tapes [from dead computer language thread]

by paul.kimpel＠digm.com

Yes, DCALGOL is still around and actively used. It is a superset of the standard Extended ALGOL, and originally exposed some special APIs and data types for talking to the Datacom Processor front-end. Those APIs are still used, although the "front end" is now TCP/IP. The language has since been extended with numerous other APIs for use primarily by system-programmer types. There is also a DMALGOL compiler primarily used internally with the DBMS, DMSII. All three ALGOL variants have been compiled from the same source code since sometime in the '70s. DCALGOL would have been no different than ALGOL for dealing with tapes, and I'm surprised you found it harder to do with the MCP than with OS/360 EXCP I/O. Depending on the block and tape label formats, you may have had to do your own deblocking, and possibly read the tape as unlabeled, but the MCP I/O Logical I/O subsystem was quite rich even in 1975. You had to understand how the file attribute settings worked when dealing with non-native tape formats, however -- I've seen that trip a lot of people up. As an alternative, a variant of Logical I/O called Direct I/O was available, which is user-mode asynchronous I/O that reads and writes raw blocks. It's basically a thin wrapper around the MCP's internal Physical I/O mechanism. I know this is water long over the dam, but I'd be interested in hearing what kinds of issues you encountered, and if possible, a reference to the DEC formats you were trying to read.

1 month, 1 week

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Re: What constitutes a dead computer language

by Mark Kahrs

As a fan of BCPL (from the Alto), I only wish it was better documented. For example, Tripos has next to no documentation on it including how to compile and load it. Documentation on the runtimes is also lacking (and that's where the rubber meets the road). Unfortunately, the Alto changes were not picked up so it remains an isolated branch (and *dead* by the definitions put forward).

1 month, 1 week

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m4 model 9914 tape drive and 800dpi 9track tapes

by Bill Degnan

I have found that a modernish Dell PC (win 7 era) when attached to a m4 9914 tape drive has issues when attempting to read 800dpi 9track tapes. I/O errors that seem to be centered around variable block size microcode of the modern scsi controller (?) I've spent a number of hours on it and I could not even pull raw data off an 800dpi tape. 1600 no problem. works fine. is there a tweener box or scsi controller that will work in this situation? what do other people do? Bill

1 month, 1 week

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Re: What constitutes a dead computer language

by Paul McJones

On 6/20/2026, ben <bfranchuk(a)jetnet.ab.ca> wrote: > PL/1 and C are the only two high level languages a operating system is > written in, that I can think of that are well documented, and easily > found on the WEB. Additional examples: Pilot (the embedded operating system for the Xerox Star office automation system) was written in Xerox's proprietary Mesa language. History and documentation of Mesa (and some Pilot documentation and early source code) are available here: https://softwarepreservation.computerhistory.org/mesa/ Taos, the operating system for the DEC Systems Research Center Firefly multiprocessor workstation, was written in Modula-2+, which added threads, garbage collection, and runtime type dispatch to Modula-2. History and documentation of Modula-2+ (and Taos) are available here: https://softwarepreservation.computerhistory.org/modula2+/ SPIN, an extensible operating system written at the University of Washington, was written in Modula-3 (with small extensions). History and documentation for Modula-3 are available here: https://softwarepreservation.computerhistory.org/modula3/ and information on SPIN is available here: https://softwarepreservation.computerhistory.org/modula3/#SPIN_M3 .

1 month, 1 week

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HP 50Meg disk pack HP13394A

by steve shumaker

Anyone here have an interest or need for a HP13394A removable disk pack? I stumbled across it in a garage cabinet at an estate sale. According to google, it was used in a HP7920 disk drive system with early HP mini processors. Before I post it on THAT website, figured I'd check to see if anyone here could use it. Unit seems in fairly good shape - at least physically. Please respond off-list if interested. Steve Shumaker

1 month, 1 week

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UNCOL why it failed

by ben

UNCOL failed because of many reasons, none that I know of. I put the blame on hardware design,throw some logic and memory together CHEAP,QUICK and DIRTY and call it a computer if you can sell one. Call it a computer standard if it for a PHD. Today's memory is loosely based on 8 bit byte addressing, yet there is no Mathematical abstract model to base the computing side of the picture. What are the problems that need to be solved? What are the real world hardware problems like I/O? Are things defined recursivity, in that a simple version, can expand to a complex, and really complex version. Register addressing,base register addressing, array, base register addressing ... Algol 9000. UNCOL is from the era, that it was thought lower cost hardware as gates and memory it would possible have general purpose computer of 32K words or more. 36 bits or bigger word length for single precision floating point. A character set of LATIN upper and lower case letters,and a limited ALGOL 60 character set, like '10' and 'BEGIN' keys.

1 month, 1 week

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Looking for RLV12 card (DEC M8061)

by Charles Morris

The RLV12 (RL02 drive controller) in my PDP-11/23+ has decided to quit working when it gets hot in the room. RT-11 won't boot, with an ERR 15 Controller Error. The defect may have become permanent, will have to check in the morning when everything's cool. The drives themselves are not indicating any faults, and both of them exhibit the same behavior on boot. Trying to rig up an emulator (or boot XXDP from the Teac 3.5" floppy) introduces a whole new set of hair-pullers. Since the RLV12 is so complex, I am tempted just to replace it, if one can be had... so does anyone have one they don't need? :) thanks Charles

1 month, 1 week

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