The resolutiion is not strange - its just simple high res EGA resolution (MCGA came out about 85/86, later to be named VGA with little more memory and outside of the ibm microchannel architecture)
The matter with this mode was, that you couldnt update the frame very often, as the bus and the cpu weren't fast enough (there was the possibility to pan around a virtual screen size of 2x2/4x1 of the resolution with hardware registers though, sadly only seldom used)
so not many games could use this mode, games like text adventures though worked very well with it (and there were quite a few up until the beginning of the nineties)
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