Working on the 2121 support in IBMulator, I started looking for any kind of information about the video interface.
According to IBM Corp., the PS/1 2121 has a standard VGA adapter with 256KB of memory, very much like the 2011’s one.
The chip actually used is the IBM 84F7985 / TI CF62011BPC but, unfortunately, there’s no datasheet and technical information about it is practically non existent (if you know anything about it please let me know!)
