This directory contains stuff at least vaguely related to the IBM PC architecture and/or PC-DOS. dasm Disassembler for 8080, Z-80, and 8086 code. Does an execution trace to assign labels and attempt to distinguish data from code (it can accept a file full of entry point addresses to help get it right). floppy Sample code for programming floppy controllers, for the IBM PC, the TRS-80 Model II, and also VAXen using a strange Q-bus monstrosity used in one of the hardware design courses at RPI. freedos FreeDOS 1.0 kernel with bug fixed so that Ersatz-11 will run. pdpxasm Jim Cook's PDP-11 cross-assembler/disassembler/linker, runs under DOS. Intended for the Osprey PDP-11-on-a-card made by Strobe Data Inc., but useful for any PDP-11. util A bunch of small utility programs for DOS, with assembly language source code.