Zenith Z-100 Reference Manual page 77

Page 5.20
Keyboard
To compile the above code using the Macro assembler, enter the following com-
mands:
MASM BI G KBUFF;
LINK BIGKBUFF;
EXE2BIN BIGKBUFF. EXE . CO M
The MASM file is only on the Programmer's Utility Pack distribution disk. The
LINK and EXE2BIN files are both on the second distribution disk of MS-DOS.
You should not see any errors in the MASM sequence or the EXE2BIN operation.
You will see an error in the link sequence (missing stack segment), which is
normal.