TASM assembly code and macros for making all types of relative calls and jumps.
hardware conversion to 27c256 for original style M100 boards with the messed up rom pinout.
There are two PCB versions of the M100-- one that is compatible with the published schematic (uses the oddball ROM pinout), and one that uses the standard ROM pinout.
Which do you have? If you are lucky you have the standard ROM version...which means ROM updates were really easy for you.