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  • \$\begingroup\$ Note that mov al, 13h is incorrect unless it is guaranteed by DOSBox to have ah = 0 at the program entrypoint. \$\endgroup\$ Commented Apr 17, 2019 at 15:18
  • \$\begingroup\$ @MargaretBloom ax is 0 at start of com application in ms dos \$\endgroup\$ Commented Apr 17, 2019 at 15:27
  • \$\begingroup\$ Thanks Iłya, that's good to know! \$\endgroup\$ Commented Apr 18, 2019 at 7:13