James has modified Wolfenstein 3D to work on a PC XT in CGA and also wrote a web navigator : MicroWeb for Intel 8088 or compatible CPU, CGA, EGA, VGA or Hercules compatible graphics card, network interface (it is possible to use your machine's serial port with the EtherSLIP driver), mouse is desirable but not 100% required, 640k RAM is desirable. EMS/XMS are not required. And thanks to the author of the PicoMEM, MicroWeb is now supporting the CGA 16 colours of the Amstrad PC 1512 (was monochrome before, and GIF support too), but I dont see a new release in the github, so wait a bit.