This is a thread to save information and progress about VXI and related topics.
VXI is a huge topic as it is aimed at instrumentation, test automation and to some extent control applications, where the UI normally resides on a PC or workstation over a highspeed link like the MXIbus. Commands are standardized in text but sent from the pc/workstation application. There is chance a VME board could also host a UI but the crate at hand is a C sized as opposed to B size for VME. VXI adds a twice the depth C card size and a three connector D card size (also twice the depth) and defines row A and C of the P2 connector and optionally the P3 connector. More can be read here for instance: https://physics.bgu.ac.il/COURSES/SignalNoise/vxi_tutorial.pdf
The crate at hand has 5 Tektronix VX4287 32-Channel Differential Analog/Digital Input Module boards and 1 National Instruments VXI-MXI-2 Mainframe Extender which connects the crate to a PC, but I lack both cable and the apropriate PCI card so can't hook it up.
The VX4287 has 32 programmable analog/digital inputs with +/- 25 v range and down to 12.5 mV resolution and can be programmed per I/O. A couple of Zilog Super8:s per board takes care of the intelligance, firmware sits in external ROMs.
The VXI-MXI-2 board has no general purpose CPU but a couple of ASICs developed by National Intruments for which I lack docuemtation. They are referred to as TIC , MITE and MANTIS ASICs
EDIT: Found some info on the TIC here
in Appendix A linked from here: vxitrig.htm
WBM seems to have a lot of VXI goodies
The purpose of the project is not to make a fully functional system as it involves real world simulation that we don't have and high speed data links which we can't handle yet. Instead I think it would be of interest to get the text interface up and mocking the MXI interface or even the whole mainfram extender as it lacks a CPU, with a terminal. It would also archive the VXI firmwares involved and the system.