From OHRRPGCE-Wiki

[edit] NPC definitions

1. Store NPC pictures in an array of memory buffers, rather than an allmodex screen page (done)
2. Optimize NPC picture array to behave as a cache, only storing each set once, and automatically adding new entries when alter NPC changes an NPC's picture (done)
3. Update the N lump. (not required, could still happen later)
   • remove bsave header
   • store record size in BINSIZE.BIN
   • get rid of 1920 wasted bytes in each record (done)
   • store N lump record count to MAP lump
4. Update all code that assumes that exactly 36 NPCs exist
   • take special care that accessing non-existent NPC IDs <= 35 from a plotscript fails gracefully (why was this a problem?) (Not sure, since accessing a non-existent NPC ID <= 35 does nothing anyway) (N/A)
5. Increase the NPC limit (done)
6. Increase the limit even more!

[edit] NPC locations

...and while we are at it...

1. Convert custom to use NPCInst objects instead of an array
2. update the L lump.
   • remove BSAVE header.
   • store data grouped by NP instance, not grouped by type of data
   • 2 wasted bytes in each record
   • get rid of off-by-one's
   • store L lump record count to MAP lump
3. Update all code that assumes that exactly 300 NPC instances exist
4. Update code that saves/loads temporary map state
5. update Save to store instances more sensibly
6. raise NPC instance limit

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Note that just because you will be able to use lots of NPCs on a single map, don't go hog-wild, because too many extra NPCs will have a performance impact, both on display and tag-checking.