Thursday, July 2, 2026

Started master file list from all 2315 cartridges and stored on Google workspace

ARCHIVED VIRTUAL DISKS FROM AN IBM 1130 SIMULATOR

I have been using the IBM 1130 simulator from Carlos Vincenzi and looked at the virtual disk drives from release 4.4.1.R9 as that is the version I have used the most. I grabbed 9 virtual disk drives from their and ran off the contents from the LET, FLET and SLET of each cartridge.

I entered them in the master spreadsheet I decided to use. This will let me quickly search for a file name and see all the cartridges that contain that file. It also provides an inventory of the cartridge as a whole. 

I will use the Unique field to assign some kind of globally unique identifier since I already have several virtual cartridges that had the same four hex digit ID assigned. For LET and FLET entries, it is the number of sectors the file consumes on disk. For the SLET entries, it shows the size in words of that phase. As well, the type field for the SLET will be the two character phase ID. 

Some files have multiple named entry points, thus the size and type fields are blank for the additional names. The names FADD, FSUB, FADDX and FSUBX are all contained in the one file whose initial entry is FADD. The file is in Disk System Format and takes up 8 sectors of the LET. 

In addition to the compact DSF format, files may be stored in Disk Core Image (DCI) format or in Disk Data Format (DDF). A DSF file must have all its linkages resolved and be combined with all other files it requires to produce the final core image that is what executes. Thus DSF is more compact, but DCI skips the time needed to link together all the files so it is faster to execute. DDF files are not executable. 

Files such as FADD are standard FORTRAN subroutines, loaded when the Fortran compiler was installed on this cartridge. Other files can be applications and utilities, either provided by IBM, from contributors or developed by the user. I will use the Purpose field to note what I discover about the files that are not standard parts of the Disk Monitor System and its compilers. 

The nine cartridges gave me 4, 095 entries in the spreadsheet. I envision the entire archive will be in the range of 100,000 to 200,000 entries. This is why I hosted it on Google. In addition, I can share it easily with other hobbyists and researchers. 

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