Oliver VieBrooks

Articles

2026-11-06 The prompt is not a security boundary
Anything a model reads can steer it, so put your access controls in code the model can't talk to.
2026-10-16 Reverse engineering with an AI in the loop
Printouts, then Ghidra, now an agent driving Ghidra. What changed, what didn't, and how you know the answer is right.
2018-05-15 Digital Archaeology: The LTK HDS
A bin of damaged Lieutenant Kernal hardware, and the start of getting a C64 hard drive system and an old BBS's drive working again.
2017-02-27 C51 Kit Evaluation
A cheap unassembled 8051 kit with an STC 89C52RC, an LCD and some buttons, from soldering iron to a working SDCC test program.

Tools I maintain, with Linux and Windows builds:

6diss	Interactive disassembler for C64 binaries. Reads disks, exports source that reassembles byte for byte.
6hex	Hex editor with a monitor and debugger for 6502, 68000 and x86. Attaches to running emulators.
6asm	6502 cross-assembler. Reads tmpx, ACME and DASM source.
6pack	C64 PRG compressor and linker. ZX0, LZSA2, ByteBoozer2, RLE.
6basic	C64 BASIC 2.0 cross-compiler with labels, macros and a turbo mode.
6nfo	Viewer for ANSI, NFO and BIN text art. Pixel-exact at any zoom.
6blitz	Blitz! compiler and decompiler for C64 BASIC. Output is byte-identical to BC64.