April 2025 - cctalk - classiccmp.org

PDP-8 and PDP-12 Paper Tape Images Posted (Re: Paper Tape Reader Needed)

by Jay Jaeger

I have posted my PDP8 and PDP12 paper tape images onto my Google Drive (where they are also available to CHM/Al Kossow for their "bits" collection. https://drive.google.com/open?id=0B2v4WRwISEQRWWFFdVpCZWFTZEU&resourcekey=0… Look in bits/DEC/pdp8 and bits/DEC/pdp12 for folders "From_JayJaeger". There is a PDF of the contents of BOTH directories in each one (it is the same PDF in each case). JRJ

10 hours, 11 minutes

1
0
0 0

System Source Swap Meet April 26 & 27, 2025 (Hunt Valley, MD)

by Jeffrey Brace

More info here: https://ca.syssrc.com/wp/?page_id=105&civiwp=CiviCRM&q=civicrm%2Fevent%2Fin…

10 hours, 13 minutes

1
0
0 0

VCF East photo gallery

by William Sudbrink

Commodore Z has put up a very nice gallery of photos of VCF East 2025: https://www.commodorez.com/VCFEXX/index.html Bill S. -- This email has been checked for viruses by Avast antivirus software. www.avast.com

12 hours, 45 minutes

3
2
0 0

RK11-D register address assignment

by Jos Fries

The "RK11-D and RK11-E moving head disk drive controller manual" (EK-RK11D-MM-002) states in par. 2.5 (Installation Procedure) that the register and vector addresses of a RK11-D can be configured by "seven interrupt vector address jumpers and eight address selection jumpers of the M7257". The manual however doesn't state the address range that can be configured by these jumpers and refers to engineering drawing D-CS-M7257-0-1 for that information. I found these drawings in the RK11-D Engineering Drawings but cannot find information in them on the valid address ranges. Therefore my question: what is the address range a RK11 controller can be configured for?

1 day, 1 hour

4
6
1 0

Looking for VAX/VMS v4.x Software

by Christian Gauger-Cosgrove

Greetings, Long story short, as the subject line says, I'm looking for some VAX/VMS v4 era software. I've been working on putting together a "turnkey" VMS v4.7 system — I've mentioned it over on the SIMH mailing list once or twice, and if anyone is on the ClassicCMP Discord server, Mainframe Enthusiasts Discord Server, or DEC Discord¹, you've likely seen me mention it multiple times — and I'm currently trying to copies of some of layered products. To the crux of the issue, does anyone here have — as an image, or media that they are are willing to image/have imaged — the installation media for the following software for VAX/VMS v4.x? • VAX NOTES • VAX P.S.I. • VAXset/DECset — specifically the Language Sensitive Editor • CGRAF and CIMI And just because I have a deep loathing for myself: • Eunice I'm also always open to any other software for VMS v4.x if anyone has any they want to share. Best regards, Christian ¹: "The Digital Equipment Corporation Fan Spot", as it's named properly. -- Christian M. Gauger-Cosgrove STCKON08DS0 Contact information available upon request.

1 day, 5 hours

6
7
0 0

RSX11M tape copy

by Peter Ekstrom

Hello all, I have transferred some simh .tap files to my PDP-11/23+ running RSX11M+. There I have tried to use VCP to attach them to a virtual device but I keep getting an invalid record format error. I then realized the simh .tap files most likely aren't organized correctly. If I attach them to TS0 in simh I can work with them. So now I am trying duplicate a tape into a new .tap file created using VCP. I can't for the life of me get it to work though. BRU doesn't support tape-to-tape and FLX doesn't complain but also never completes. Is there a process for tape duplication under RSX? The images were first transferred to my PiDP-11 using ftp in binary mode over TCP/IP. From there I used NFT in image mode and I tried both record and block modes. I have also seen the simh tape tools but there doesn't seem to be a tool to convert a simh file back to what would be on a real tape. Anyone have any information or pointers to get this to work? Thanks! -Peter

1 day, 18 hours

3
4
0 0

ThornEMI Datatech 9800 9-track tape drive

by Lothar Schröder

G'day, I have a ThornEMI Datatech 9800 9-track tape drive. Has anyone a user- or service-manual or a description how to load a tape? This drive can load the 7" 9-track tape reels and has an industrial interface with edge-connectors P1 and P2. Thanks in advance Lothar

1 day, 23 hours

3
3
0 0

VCF West 2025, Exhibit Registration Open - August 1-2 - Computer History Museum

by Jeffrey Brace

VCF West 2025 Exhibit Registration Now Open!!! VCF West is August 1-2 at the Computer History Museum Register an exhibit here: https://forms.gle/vQj4PUJCidjFt9GF8

2 days, 19 hours

1
0
0 0

Is the mailing list down?

by Tom Hunter

I have received no messages for a while. Is the list down? Thanks Tom

3 days, 3 hours

5
5
0 0

Philips P3800 key lock swtch

by Tony Duell

Does anyone know anything about the key lock on the mains on/off switch of the P3800? I have one without a key. I can't identify the lock manufacturer (no markings on it at all) so I've not been able to get a blank to cut a replacement key. A friend who is a locksmith said she'd never seen anything like it. Any ideas who made the lock itself? Were all P3800 machines normally 'keyed alike' If so, a copy of an existing key (anyone have one?) would be a great help. Yes, I can trvially bypass the lock/switch mechanically or electrically. But I want to try to get this thing as original as possible. -tony

4 days, 14 hours

22
67
0 0

2025

2024

2023

2022

cctalk April 2025