Friday, April 4, 2025

Running IBM disk diagnostic 309 against the Virtual 2315 Cartridge Facility - part 3

›
DEBUGGING TO FIND THE ISSUE I looked for asymmetry - places where the logic in the IBM 1130 disk controller or Virtual 2315 Cartridge Facili...
Tuesday, April 1, 2025

Running IBM disk diagnostic 309 against the Virtual 2315 Cartridge Facility - part 2

›
RESULT OF DEBUGGING SESSION ON SEEK ERRORS My first test was performed by setting up manual XIO commands to seek forward, seek in reverse, r...

Feeling a bit more confident in the IBM 1130 core memory

›
CE STORAGE DISPLAY FUNCTION OF THE MACHINE The machine has a few switches intended to be used by the Customer Engineer who services the syst...
Monday, March 31, 2025

Running IBM disk diagnostic 309 against the Virtual 2315 Cartridge Facility - part 1

›
IBM DISK FUNCTION DIAGNOSTIC 309 LOADED INTO CORE IBM wrote a diagnostic to shake down a 13SD disk drive (the drive that is inside the IBM 1...

Final parts arrived so I could finish up the Power Distribution Board and second 2310 Interface Board

›
2310 INTERFACE BOARD WAS WAITING FOR ONE SCREW TERMINAL PART When that arrived, the second board was completed and is ready to install in an...

Repair of IBM 1130 core memory with failure of bit 13 inhibit in lower 4K

›
ROLE OF INHIBIT WIRES Core memory consists of a memory plane for each bit in a word. X and Y address lines select one core in a 2D grid on t...
Sunday, March 30, 2025

More 'whack a mole' - memory issues crop up; did fix a few things

›
CORRECTED TEMPORARY WIRING FOR V2315CF I had failed to connect the sense line for power failure from the main Virtual 2315 Cartridge Facilit...