Computer organization – Geronimo/370

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

MTS up and running

Posted on2018-12-192019-03-23

Today I got my copy of MTS (Michigan Terminal System) and installed it in Hercules on my Raspberry Pi model 2, using the try-mts cookbook. See this page for more info on MTS. Below you will find a screenshot of the up and running system.… Read the rest

S/370’s up again

Posted on2018-12-152019-03-23

Finally, ready, my IBM S370 OS’s are live again. It took some tinkering to get them running on the new SSD drives, but here we are: … Read the rest

Datacenter up again

Posted on2018-12-152019-03-23

After a crash yesterday, my ‘datacenter’ is up again. I took the time to alter the setup. It’s not on my desk anymore… 😉 Datacenter up and running again… Here you see the login screens for my two Ma’c (top) and three Raspberry Pi’s (bottom). Could I be a Startrek… Read the rest

8 bit computer, progress on the Control Unit

Posted on2017-10-18

8 bit computer, progress on the Control Unit Below some pictures of the progress of the construction of the Control Unit of my 8 bit computer. Two pictures, one of the front and one of the back. I’m not satisfied with the layout, and I think I am going to… Read the rest

8 bit computer, solution for the microcode

Posted on2017-10-09

8 bit computer, solution for the microcode As I mentioned in this post, I was looking for a solution to program a couple of EEPROMs that are going to hold the microcode for my 8 bit computer. Using an Arduino Nano, I created a solution that also uses a python… Read the rest

8 bit computer, building up the Control Unit

Posted on2017-09-30

8 bit computer, building up the Control Unit Here’s the start of the building of my Control Unit:… Read the rest

8 bit computer, storing the microcode, solution

Posted on2017-09-30

8 bit computer, storing the microcode, solution I have a solution for the micro code predicament mentioned before. I’m using an 8KB EEPROM memory chip (the AT28C64). These memory chips will be divided into four segments, each holding pieces of microcode. Decoding instructions This microcode will be addressed as follows:… Read the rest

8 bit computer, microcode challenges

Posted on2017-09-24

8 bit computer, microcode challenges My 8 bit instructions can have up to 8 microcode steps each; I defined up to 24 control signals (thus needing 3 bytes per step); So in the Arduino Nano I’m using, I have to define them as uint32_t variables (which are 4 bytes long).… Read the rest