I used to have to manage memory in MS-DOS for CA/400 for DOS, Netware client, and MS LAN Manager. Things got easier with MS-DOS 6.X and memmaker but MS-DOS 5.0

I used to have to manage memory in MS-DOS for CA/400 for DOS, Netware client, and MS LAN Manager. Things got easier with MS-DOS 6.X and memmaker but MS-DOS 5.0 I had to managee upper memory by hand. I had to configure adapter card ROM memory to fit into the same 64K C000 block so that there was 64K free D000 for an upper block to more the network drivers into to keep more conventional memory free.