What I'm sure Md95 was talking about are the MD-90s that were specially outfitted with the Honeywell 6-display EFIS for Saudi Arabian Airlines. You are right, though; the vast majority of the -90s out there have the standard MD-88 flight deck with very few modifications.
Honeywell’s Versatile Integrated Avionics (VIA) platform is an LRU-based system derivative of the Airplane Information Management System developed for the Boeing 777. Certified on the Boeing 737NG for flight display functions, VIA is additionally certified on Boeing 717 and MD10 aircraft for flight management, flight displays and fault warning. With a common hardware/software architecture, VIA is configurable to meet the needs of a variety of avionics applications. Lockstep processing for cycle-to-cycle concurrent monitoring and an ARINC 659 fail-passive communications path are among the features that assure high integrity processing for flight critical functions. The VIA architecture provides support without the expense of hardware voting monitors. Robust time and space partitioning (provided by hardware, ARINC 653 O/S and qualified tools) give VIA the flexibility to integrate multiple flight functions in one box.