msx2msa – Sim­u­late msxm and msym fonts us­ing msam and msbm

In the deeps of time, the AMS dis­tributed math­e­mat­i­cal sym­bol fonts called msxm and msym; these fonts were de­signed us­ing the orig­i­nal (SAIL) ver­sion of Meta­font and for a long time af­ter the demise of that sys­tem were only avail­able as 300 dpi bitmaps.
Even­tu­ally, the sym­bols were re-im­ple­mented us­ing ‘mod­ern’ Meta­font in fonts called msam and msbm. The vir­tual fonts of this bun­dle im­ple­ment the en­cod­ing of the old fonts us­ing the glyphs of the new fonts, and can be used as drop-in re­place­ments in doc­u­ments (and even when pro­cess­ing DVI files).