Original oil and gas trade magazine vintage ad for SEISCOM DELTA INC, of Houston, TX. Megaseis. We Are Confident That Our New MEGASEIS System Offers the Best Price and Performance Ratio of Any Seismic Processing Systems Now Available - No Matter How Large or Small Your Needs. 32-bit architecture and core expandability to One Megabyte. Unique old petroleum oilfield computer seismic exploration industry magazine advertisement.