Virtual 2315 Cartridge Facility for IBM 1130 up and working

[Carl Claunch]

I developed this to install on an IBM 1130 in order to make use of files that contain the image of data for a 2315 cartridge, which are loaded and accessed by the 1130 as if it were a physical 2315 inserted in a disk drive.

The disk drive is modified so that the heads do not load down on to the platter. A 2315 is in the drive solely to provide the sector pulses and to spin up to give the noise and vibration of a drive working.

When the 1130 does a seek, it is also mirrored on the physical disk drive, giving the user the sounds they are accustomed to. Reads and writes are captured by the device and served from RAM in the unit. After the physical disk drive is powered down, the unit can unload the RAM back to the file preserving all the changes made during the session on the 1130. 

The files are on microSD cards, inserted into a Mini 2315 Cartridge which is a 2" diameter object that looks like a 2315 but has the microSD card and socket inside. This plugs into the box of the Virtual 2315 Cartridge Facility analogously to how a real 2315 is inserted into the slot of the disk drive. 

This normally operates in its 'real' mode with the 1130 disk drive spinning up some random cartridge to provide the seeking sounds and other sensations, but can be switched to 'virtual' mode where the disk drive is left off entirely. 

A 12V battery provides ride-through power to perform an emergency unload of the RAM contents when the 1130 drops power, to ensure the cartridge file is up to date and complete. 

All code, design files, documentation etc will be on github.

[Bob Flanders]

This is very cool. 

Can you do a video showing it working with disk sounds?

Thanks!

Bob

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[Claudio Vincenzi - GMail]

That's what a really 1130 lover would do!  Impressive, Carlos, really.

Congrats!!!

Claudio Vincenzi

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[Carl Claunch]

I will indeed be recording the machine working with the disk drive. 

Carl

On Friday, March 21, 2025 at 12:40:01 PM UTC-4 Bob Flanders wrote:

This is very cool. 

Can you do a video showing it working with disk sounds?

Thanks!

Bob

ups.google.com/d/msgid/ibm1130/f4ed39af-31f6-4a58-964c-9a4607c6ce1an%40googlegroups.com.

[Claudio Vincenzi - GMail]

Don´t forget to record the audio - looking forward to hearing that old 2315 seek buzzing sound!

Claudio

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Claudio Vincenzi

[Alex D]

Since there has been more than one request for listening to disk sounds I just thought I might make some people happy and record my ASM / DUP / XEQ since I am sitting at the machine anyways at the moment  ;)

The assembler part is rather boring though 

Alex

iPhone. iTypos. iApologize

Am 22.03.2025 um 17:43 schrieb Claudio Vincenzi - GMail <c.vin...@gmail.com>:



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[Bob Flanders]

Music. Love that song. Can you do an interrupt request? I think I remember it, but I'm not sure.

Thank you  SO MUCH!

Regards,

Bob

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[Claudio Vincenzi - GMail]

Interesting that there are two distict buzzing sounds: one for inward seeks and another for outward seeks.

Other interesting sounds: 

COLD START,  with (a) heads at home and (b) heads in the middle ... tic tic tic tic .... many single cylinder seeks.

1627 PLOTTER drawing and pulling pen up/down

JOB START on the 1403, a distinct sound of the // JOB and available disk cartridges being printed. This is

difficult to get since there are very few systems with a working 1403/1133 setup.

FORTRAN compilation - when compiling a long program, the 1442 turns its motor off some seconds after END card. 

Finally, after a minute of two of suspense, the symbol table is dumped, END OF COMPILATION on the printer,

the 1442 turns its motor ON and ... // XEQ ...

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Claudio Vincenzi