Triptych

Loading WebAssembly…

Disk library

Update your saved machine

Your disks will be kept and a recovery copy will remain available.

This saved machine is not on this device

Saved machine

In this machine

Drive

I am at the CP/M prompt and ready to change this disk

Software disks

Ready to use and protected from changes.

My data disks

Writable disks saved in this browser.

Add a data disk

Name Import image

Ready-made machines

Share standard setup Share software disks only

Saved machine Bookmark this machine

Colossal Cave help

Open the Colossal Cave setup. Select C and run ADVENTUR. Use B for saved games.

Backup and recovery

Start fresh

Use this once if an old browser copy will not update. Normal updates keep your disks.

Older downloads

Open the older supplied machine · Return to your usual machine

System and tools image · Games image

Files and recovery

Drive to view or edit

I have saved and exited the guest program. Unsaved RAM cannot be recovered.

Guest stuck or disk will not boot?

Recovery starts from the last saved disk without saving the running guest. Download its latest checkpoint first if you need to keep it. Applying a replacement preserves the saved disk as a backup, but discards guest RAM and any changes not saved in browser storage.

I accept losing unsaved guest state when I apply a replacement.

Files on the committed disk (user 0)

Stage file imports

Use CP/M 8.3 filenames. Empty imports and read-only replacements are rejected. A batch is applied in full or not at all. Downloads retain 128-byte record padding.

Development tools

Nucleus source project

Edit the separate source files, save and exit, then prepare their single-file build input here. Apply and restart before running NUC GAME.NU, then GAME. This is host-assisted packaging; the released CP/M compiler still reads one input file.

Project file

Preparation stages the generated source and its source map together. Source order comes from the project file; import comments are not resolved.

Nucleus diagnostic

The original diagnostic is preserved. Mapping requires unchanged saved source and build bytes; it does not describe unsaved editor text.

Disk capacity

Target two-MiB drive slots

Choose 1–16 slots, usually 2 or 4. Empty slots remain configured and reserve the same guest memory. A must be inserted to boot. Applying a configuration replaces A's resident system, preserves existing two-MiB filesystem bytes, backs up all preceding media and reboots. Historical files are migrated only if the complete retained contents fit.

Upgrade a legacy disk while preserving files in all user areas. Apply or cancel other pending changes first. Applying the upgrade replaces the resident system, restarts CP/M and backs up the complete old disk. This profile supports drive A only; additional drives are not enabled.

A/B explicitly replaces A's resident system and preserves its files. B can then be a new blank data disk or an attached eight MiB image. Applying any change backs up both drives and their bootstrap together. Selecting A or B above only changes the Files view, not the CP/M default drive.

Whole-disk replacement

Stage disk image Adapt external image with this release's CCP/BDOS/BIOS (changes system bytes) A image resident profile

Leave adaptation unchecked for exact recovery. Applying a disk, files or tools preserves the previous committed disk as a backup.

Stage complete drive-set archive

Drive-set archives include the exact bootstrap and all media slots, including empty slots. No adaptation is applied when restoring an archive.

Recovery backups