Operating Systems – Geronimo/370

Retro Z80 computer (11) – (dis)Assembler

Posted on2022-12-061 Comment

At first, on my retro Z80 (RC2014) computer, I was using the assembler that came with CP/M, named ASM. Later on, looking for the Z80 block transfer instructions and not able to find them, I found out that it is an 8080 assembler. (hey, it’s been a long time since… Read the rest

Retro Z80 computer (10) – Pi-Terminal

Posted on2022-01-262022-01-26

I got one of my raspberry Pi’s out of storage and made it to be a terminal for the Z80:… Read the rest

Retro Z80 computer (6) – It works!

Posted on2021-12-16

I am one happy maker, I got my Z80 computer working right after building. All went well! The first lines of output are the boot screen: CP/M And of course I wanted to see CP/M running: Z80 Basic And after that, on to Z80 Basic version4.7b:… Read the rest

Uptime > 1 year

Posted on2021-10-012021-10-012 Comments

My Linux server (Debian 10 ‘Buster’) is running over one year now:… Read the rest

BIOS upgrade

Posted on2021-08-062021-08-06

Today, looking for (virtualization) features in my computer, I came across the firm ikbenstil.nl. It came highly recommended by my son in law, a geek like me. I called them and they were indeed very helpful and customer friendly. They showed me the way around my BIOS and helped me… Read the rest

My command center

Posted on2019-12-242019-12-242 Comments

In the image you can see my ‘command center’. I run 5 emulated mainframes, four of them on Raspberry Pi’s and one of the in the cloud. With all five system you see a 3270 terminal and the emulator console next to each other: Top left is my cloud system,… Read the rest

Made my home cloud server

Posted on2019-12-072019-12-07

Today I finished setting up my own home cloud server – on a Raspberry Pi 4. I did that using the software provided by Nextcloud. It’s relatively easy to set up once you have it installed. The installation includes setting up a firewall, a webserver (using LAMP), a self signed… Read the rest

Video series about SCEPSIS

Posted on2019-07-182019-07-18

I’m in the process of producing a viedo series about my Simple CPU emulator, SCEPSIS. You can find the expaning playlist here: playlist for SCEPSIS videos… Read the rest

SCEPSASM – The SCEPSIS Assembler

Posted on2019-06-202019-06-20

SCEPSASM is an assembler that will – based on a language definition (langdef) file – parse a source file and convert it into an object memory file that can be executed with the SCEPSIS emulator. The SCEPSASM main screen The current version works and it’s output OBJect files will be… Read the rest

A sad day for Free XA…

Posted on2019-06-182019-06-181 Comment

Response from IBM Regarding Our Petition By Moshix Jun 17, 2019 — Dear Petitioners We spoke today with the Vice President of Strategy for IBM’s mainframe division. This call was a follow-up of a previous discussion held on the subject of our petition. IBM has duly considered our petition and… Read the rest

tmux terminal organizer

Posted on2019-05-042019-05-06

tmux is short for Terminal Multiplexer. And that’s what it does. It’s a neat little tool that I use to be able to have multiple sessions open at the same time and to be able to switch between them. As an example you can click on the picture to the… Read the rest

1.000 petitioners!

Posted on2019-05-012019-05-01

Our petition reached a stunning 1.000 signers! What a great support this is!… Read the rest

Free XA !

Posted on2019-03-122019-06-20

We, a couple of IBM mainframe enthusiasts, have started a campaign to petition our friends at IBM to release MVS/XA and VM/XA along with 31bit compilers. Please take a minute to sign the petition and make ourselves be heard by the power that be at IBM. Sign the petition! [link… Read the rest

IBM/370 Reference Summaries

Posted on2018-12-242019-03-23

I kept a couple of Reference Summary cards from ancient times. I photographed them to be shared with the community. See the cards themselves here. System/370 DOS/VS POWER/VS Reference Summary CICS Master Terminal Operator Reference Summary IBM Reference Card | COBOL System/370 Reference Summary… Read the rest

Hercules S/370 print to PDF

Posted on2018-12-212019-03-23

Today I automated the process of printing MVS output from the Hercules emulator to PDF files. It makes it much more realistic and nostalgic to look at output on the old ‘zebra-paper’, don’t you think? Example below. Also check my project page to see how it’s done.… Read the rest