IDS 7.3 initialisation errors on SCO nixWare 7.1

I have tried to install a basic config of IDS 7.3 onto Unixware 7.1. I have tuned the kernel parameters according to the release notes but keep getting the following error msg when i do oninit -i 15:27:34 shmat: [EMFILE][24]: out of shared memory segments, check system SHMSEG 15:27:34 mt_shm_init: can't create virtual segment I have been told to look for a similar parameter to NOFILES but I cant see anything appropriate on UW 7.1. Some kernel params are: SHMMAX 12000000000 SHMSEG 2048 NPROC 3000 Any ideas ? we have 64 Mb RAM