wallneradam
dolffydos
Dolffy DOS is a drop-in KERNAL ROM replacement for the Commodore 64 that combines DolphinDOS parallel speed and a clean-room JiffyDOS serial fast loader, with optional Ultimate SoftwareIEC DMA and clock features.
AI repository intelligence
FR-AI / ANALYSISWhy it is worth attention
It demonstrates a complete low-level implementation using BIOS interrupts, unreal mode, and direct disk writes without an operating system, enabling physical memory extraction under cold boot conditions.
Who it is for
- Security researchers exploring cold boot attacks
- Digital forensics professionals
- Low-level systems programmers
- Hobbyists interested in BIOS and x86 assembly
Use cases
- Recovering encryption keys from frozen RAM
- Experimenting with cold boot attack techniques
- Performing physical memory forensics on legacy BIOS systems
- Learning about unreal mode and BIOS disk I/O
Strengths
- Custom bootloader works on legacy BIOS without an OS
- Uses memory map (INT 0x15 E820) to avoid reserved regions
- Employs unreal mode to access memory above 1MB
- Displays progress percentage during the dump
Considerations
- Requires Legacy BIOS / CSM boot (not UEFI)
- Overwrites disk data starting at LBA 64, so a dedicated blank USB drive is needed
- Limited to x86 architecture and assumes cold boot conditions for data retention
README quick start
Usage
- Build the project to generate
boot.bin.
Description
A bare-metal x86 utility to dump physical RAM directly to disk. Built and tested for Cold Boot Attack experiments on frozen memory.
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