As Rob Pike pointed out, the compacting garbage collector was used in severalof the programs written for the Blit. The source file in question is 'gcalloc.c' and it seems to be in sam source as late as 10th Edition. From a perusal of research source, it seems to have been used in jim, sam, pads, mux amongst others. ------------------------------------------ 9fans: 9fans Permalink: https://9fans.topicbox.com/groups/9fans/Tf83e4250af593565-M2ef2fd88917f26b313efd26b Delivery options: https://9fans.topicbox.com/groups/9fans/subscription